Musculoskeletal System (1-14) Flashcards
What 3 topics should be discussed when taking an orthopedic history
- presenting complaint
- general history
- problem history
for forelimb lameness, the head nod goes down on the good or bad side?
good side
A dog with a head nod down on the left side has lameness on which limb?
right forelimb
list the anatomy of the paw
- phalanges
- metacarpal/metatarsal bones
- flexor tendons
what 5 areas of the paw should be examined/palpated during a clinical exam
- digital pad/nail
- central pad
- interdigital webs
- distal and proximal interphalangeal joints
- metacarpal/tarsal phalangeal joint
List the anatomy of the carpus
- antebrachiocarpal joint
- middle carpal joint
- carpometacarpal joint
what 2 areas of the carpus should be palpated/examined during a clinical exam
- styloid processes
- accessory carpal bone
to what degree can a normal carpus be flexed
150
to what degree can a normal carpus be extended
10-20
to what degree can a normal carpus be valgused
10-15
what does applying valgus and varus stress to the carpus check for
collateral ligaments integrity
list the anatomy of the elbow
- medial part of humeral condyle
- anconeus
- collateral ligaments
- annular ligament
what 3 areas of the elbow should be palpated/examined during a clinical exam
- ulna and radius
- medial/lateral epicondyles
- olecranon (and triceps tendon)
to what degree can a normal elbow be extended
150
to what degree can a normal elbow be flexed
20
what degree should the elbow be fixed at in order to rotate the paw to test supination and pronation
90
name the 3 areas of the shoulder that should be examined/palpated during a clinical exam
- deltoid tuberosity
- greater tubercle of the humerus
- acromion of the scapula
to what degree can a normal shoulder be flexed
60
to what degree can a normal shoulder be extensed
160
to what degree can a normal shoulder be abducted
35
list the anatomy of the hock
- tarsal bones
- short and long collateral ligaments
- plantar fibrocartilage
what two areas of the hock should be palpated/examined during a clinical exam
- medial and lateral malleoli
- calcaneous/achilles tendon
to what degree can a normal talocrural (hock) joint be flexed
20
to what degree can a normal talocrural (hock) joint be extended
180
how can you check the long and short collateral ligaments of the hock?
valgus and varus stress in flexion/extension
list the anatomy of the stifle
- complex hinge joint
- collateral ligaments
- cranial and caudal cruciate
- medial and lateral menisci
- joint capsule/muscle
what two areas of the stifle should be palpated/examined during a clinical exam
- tibial tuberosity, fibular head
- patella, fabella
to what degree can a normal stifle be flexed
40
to what degree can a normal stifle be extended
160-170
to what degree can a normal stifle be rotated internally
5
list the anatomy of the hip
- femoral head
- acetabulum
- joint capsule
- Teres ligament
- surrounding muscles
what two areas of the hip should be palpated/examined during a clinical exam
- greater trochanter
- ilial wing, ischium
to what degree can a normal hip be flexed
50
to what degree can a normal hip be extended
160
to what degree can a normal hip be abducted
40
what kind of tube should be used for Arthrocentesis
EDTA tube
list 5 properties of synovial fluid
- clear, colorless or pale yellow
- viscous
- small volume
- low cell count
- mononuclear cytology
what position should the elbow be in for arthrocentesis
neutral position
what position should the antebrachiocarpal joint be in for arthrocentesis
flexed maximally
what position should the stifle be in for arthrocentesis
slight flexion
name 6 clinical signs of fracture
- loss of function (lame)
- swelling
- change in limb length, alignment or orientation
- abnormal ROM
- pain
- crepitus
what 3 things does fracture healing need
- adequate reduction and stability of the fracture site
- absence of complicating factors
- sufficient time
name 4 goals of fracture management
- reduce discomfort
- eliminate ongoing trauma
- support healing
- restore function
what two things does primary bone union require
- complete stability
- no or small fracture gap
name the type of primary bone healing
- direct apposition of the fracture ends with no movement permits direct remodelling
- new cutting cones are initiated in the region of the fracture
- reduced radiographic density at bone ends adjacent to fracture site
contact healing
name the type of primary bone healing
- small gaps between the fracture end
- minimal movement
- lamellar bone forms directly in the fracture gap
- intracortical remodelling throuhg the fracture gap then restores bone integrity
gap healing
name the neutralising force
causes lengthening
tension
name the neutralising force
causes shortening
compression
name the neutralising force
combines tension and compression: tension on convex surface, compression on concave surface - neutral axis results
bending
name the type of fracture
bone fracture secondary to an underlying pathologucal process that weakens the structure (infection, neoplasia, nutritional disease)
-normal loading results in fracture
pathological fracture
name the fracture classification
occurs in the central/middle part of a bone
diaphyseal
name the fracture classification
occurs in the wider part of the bone near the growth plate.
metaphyseal
(occurs in metaphysis)
name the fracture classification
type of bone fracture that affects the growing part of a skeletally immature animal, potential for growth plate damage
-likely articular involvement
epiphyseal fracture
name the fracture classification
when a bone breaks inside or around a joint;
must achieve accurate anatomical reduction and rigid fixation for best results;
‘no compromise’ fractures
articular fractures
name the type of incomplete fracture
skeletally immature animals where bone incompletely mineralized, so less brittle than fully mineralized adult bone;
secondary to skeletal demineralization
Greenstick
name the type of incomplete fracture
crack through a bone without alteration in its alignment and in which the periosteum is not broken;
undisplaced ones are often seen running along the cortex from a major fracture line
fissure
name the type of complete fracture
bone is broken perpendicular to its length in a straight line
transverse
name the type of complete fracture
bone is broken at an angle, straight line that’s angled across the width of your bone
oblique
name the type of complete fracture
bone is broken in at least two places, leaving a piece of bone totally separated by the breaks
segmental
name the type of complete fracture
when bone is broken with twisting motion;
fracture line that wraps around the bone and looks like a corkscrew
spiral
name the type of complete fracture
A fracture with more than one fracture line so that there are one or more intermediate fragments
multifragmentary
this is when a bone fragment is distracted by muscle pull or ligament attachment
(tibial tuberosity, olecranon, elective osteotomy)
avulsion
where does avulsion occur in skeletally immature animals?
along physis
where does avulsion occur in skeletally mature animals
at muscular/ligament insertions
this is when fracture ends are driven together;
often stable and can be managed conservatively
impacted
name the type of fracture
broken bone that causes an open wound or break in the skin;
previously known as a ‘compound’ fracture;
graded 1-3 on the severity of soft tissue injury
open fracture
what is the immediate first aid of open fractures
- cover open wounds
- control hemorrhage
name 3 clinical function signs of fracture healing
- progressive improvement in function
- consistent weight bearing
- minimal muscular atrophy
name 2 radiographic signs of fracture healing
- bridging callus
- loss of fracture lines
what 4 things should be done ASAP to treat an open fracture
- clip widely
- lavage copiously
- debride all dead tissue
- start open wound management
what 3 types of factors play a role in the fracture patient assessment score to identify ‘risky’ patients
- clinical factors
- mechanical factors
- biological factors
the higher the fracture patient assessment score, the (lower or higher?) the risk in fracture healing?
lower
which mechanical aspect of a fracture has a higher risk?
bridge fracture, contact fracture, or compression fracture?
bridge fracture
which mechanical aspect of a fracture has a higher risk?
multiple limb injury OR single limb
multiple limb injury
which mechanical aspect of a fracture has a higher risk?
toy breed, large breed, or giant breed?
giant breed
which biological aspect of a fracture has a higher risk?
juvenile, yong adult, adult, geriatric?
geriatric
which biological aspect of a fracture has a higher risk?
poor health or excellent health?
poor health
which biological aspect of a fracture has a higher risk?
good soft tissue or poor soft tissue?
poor soft tissue
which biological aspect of a fracture has a higher risk?
cortical bone or cancellous bone?
cortical bone
which biological aspect of a fracture has a higher risk?
low enery or high energy?
high energy
name 2 clinical aspects that can make fracture healing more risky
poor client and patient compliance
name one conservative method of fracture repair
cage rest
name two external methods of fracture repair
- Coaptation
- ESF
name 3 coaptation methods of fracture repair
- splint
- cast
- dressing
name 3 External Skeletal Fixation (ESF) methods of fracture repair
- linear
- circular
- hybrid
name 5 internal methods of fracture repair
- internal fixators
- plates and screws
- screws alone
- wires
- pins
name 1 salvage method of fracture repair
amputation
what is the emergency support for lower limb fractures
Robert-Jones Dressing
name 4 advantages of external coaptation for fracture management
- ultimate biological fixation
- quick
- don’t need much inventory
- MIGHT be cheap
name 3 disadvantages of external coaptation for fracture management
- heavy maintenance
- cast associated soft tissue injury
- fracture disease
name the external method of fracture management
short-term/adjunctive support;
OK for radius and ulna;
apply over cast padding and conforming bandage;
spoon part at bottom
splint
name the external method of fracture management
thermoplastic materials;
stronger and lighter than Plaster of Paris;
need to be quite hot before they are moldable;
can be awkward to use
anatomical molded splints
name the external method of fracture management
cheap;
easy to apply;
conform well;
take 8+ h to dry fully;
heavy to wear;
radiodense
Plaster of Paris (cast)
name the external method of fracture management
light and strong;
don’t soften when wet;
conform well;
set rapidly;
radiolucent;
need an oscillating saw for removal
Fiberglass/Resin (cast)
how often should a cast be checked by a vet
weekly
name 5 signs of cast complications to explain to owners to watch for
- rubbing/chewing at cast
- swollen foot pads
- bad smell
- stops weight bearing
- becomes ill
name 4 possible cast complications
- soft tissue complications (pressure sores, ischemia)
- fracture disease (muscle wasting, stiffness, osteoporosis, tissue adhesion)
- malunion
- delayed union
name the external method of fracture management
a series of percutaneous pins that pass into or through the bone and are connected externally by clamps and rods, acrylic bars and epoxy putty
external skeletal fixation (ESF)
name 3 advantages of external skeletal fixation (ESF) for fracture management
- versatile
- easy to apply
- compatible with principles of ‘biological osteosynthesis’
this aims to take full advantage of biological healing potential to maximize rate of fracture healing (maintain limb length and orientation & avoid creating further surgical trauma);
goal is to provide an optimal biological and mechanical environment for fracture repair
biological osteosynthesis
what type of pins does unilateral frame for external skeletal fixation (ESF) use
half pins
what type of pins does bilateral frame for external skeletal fixation (ESF) use?
full pins
which type of external skeletal fixation (ESF)?
unilateral, uniplanar
type 1
which type of external skeletal fixation (ESF)?
bilateral, uniplanar
type 2
which type of external skeletal fixation (ESF)?
bilateral, biplanar
type 3
which type of external skeletal fixation (ESF)?
ring fixator, cESF
Ilizarov
which type of fixation pin for external skeletal fixation (ESF)?
holds fracture together by friction only
smooth pin
which type of fixation pin for external skeletal fixation (ESF)?
good bone purchase;
weak point must be protected
negative profile thread pin
which type of fixation pin for external skeletal fixation (ESF)?
excellent bone purchase;
no weak point;
must pre-drill a pilot hole
positive profile thread pin
what should the width of the pins used for external skeletal fixation (ESF) be?
20-25% of cortical width
how many pins should you aim for per fragment in external skeletal fixation (ESF)?
3 pins per fragment
what can external skeletal fixation (ESF) be used for besides just fracture management?
protection of ligament repairs
name the internal method of fracture repair
holds fragments in alignment;
resists bending but NOT rotation, shear or axial shortening
intramedullary (IM) pins
what should the diameter of IM pins be?
aim to fill the medullary canal at narowest point
name the method of placing an IM pin
- introduce pin away from fracture site
- reduce fracture
- advance pin across fracture
may be able to do this closed
normograde pinning
name the method of placing an IM pin
- introduce pin at fracture site
- push/pull pin through bone to allow fracture reduction
- reduce fracture and drive pin across fracture line
retrograde pinning
what bone can you NOT use intramedullary (IM) pinning in?
radius
name the internal method of fracture repair
an IM pin perforated to accept bone screws;
neutralizes all forces very effectively;
requires specialized instrumentation;
can be technically challenging
interlocking (IL) nail
name the internal method of fracture repair?
used to repair fractures or osteotomies which are subjected to distractive forces (olecranon osteotomy, tibial tuberosity avulsion, malleolar fracture);
figure 8 wire anchored in a transverse bone tunnel and passed around the ends of the pin(s);
anchored by twisting ;
converts distractive forces to compression at the fracture line
tension band wiring
name the type of bone screw
cut their own thread in the bone;
cutting tip
self tapping
name the type of bone screw
thread must be cut in the bone;
thread conforms exactly to screw profile;
maximises metal-bone contact and holding power
tapped
name the 5 steps of bone screw placement
- drill pilot hole
- measure depth of hole (and add 2mm)
- Countersink
- tap
- place screw and tighten
name the type of bone screw
when the screw crosses a fracture line that can be compressed;
provides interfragmentary compression
Lag Screw
name the type of bone screw
when the screw crosses a fracture line that cannot be compressed;
when near fragment is too small to take a gliding hole
position screw
what 3 ways can a bone plate be applied
- compression plate
- neutralisation plate
- buttress plate
name the type of bone plate
bone is anatomically reconstructed and load sharing;
promotes primary bone union;
uses tension band principle
compression plate
name the type of bone plate
applied to protect a lag screw reconstruction; cannot take significant loads without failure;
load sharing between plate and bone
neutralisation plate
name the type of bone plate
fracture cannot be anatomically restructured;
no load sharing between bone and plate;
plate transmits the full force of loading across the fracture gap
buttress plate
this is inflammation/infection of the bone and associated bone marrow
osteomyelitis
what is the most common source of infection causing osteomyelitis?
post-surgery
(open fracture, open reduction of closed fracture)
name 4 sources of infection causing osteomyelitis
- post-surgery
- penetrating injury
- local extension
- haematogenous spread (rare)
what 3 things does the establishment of infection in the bones/bone marrow require?
- sufficient numbers of pathogenic bacteria
- avascular cortical bone
- favorable environment for colonization and multiplication
name 5 clinical signs associated with acute osteomyelitis (ex: following extension of a deep surgical site infection)
- localized pain
- swelling
- pyrexia
- anorexia
- lethargy
name 4 clinical signs associated with chronic osteomyelitis
- lameness
- bone pain
- swelling
- heat
name 5 radiographic signs of osteomyelitis
- bone destruction
- periosteal new bone formation
- soft tissue swelling
- sequestrum formation
- delayed or non-union
this is failure of bone healing and is usually iatrogenic; i.e. YOUR FAULT
non-union
name the type of non-union
usually arise due to inadequate stability of the fracture site or inadequate reduction;
should heal following adequate stabilization
viable non-union
name the type of non-union
highly vascular fracture site;
significant callus;
need to work out what is wrong and put it right (remove loose implants and stabilize fragments);
don’t usually require bone graft
hypertrophic non-union
name 4 types of non-viable non-union
- dystrophic
- necrotic
- defect
- atrophic
name the type of non-union
blood supply inadequate
dystrophic (non-viable non-union)
name the type of non-union
necrotic tissue in fracture site
necrotic (non-viable non-union)
name the type of non-union
bone defect at fracture gap
defect (non-viable non-union)
name the type of non-union
biologically inactive;
no evidence of attempt to heal;
bone ends sclerotic and atrophied;
medullary cavity may seal over;
fracture gap fills with fibrous tissue;
pseudoarthrosis formation
atrophic (non-viable non-union)
what is the treatment for atrophic non-union of a fracture
- aggressive treatment (open approach, debride fracture ends to viable bone, open medullary cavity)
- rigid stabilization
- bone graft
this is when the quadriceps muscle becomes adherent to fracture site;
progressive decrease in range of stifle joint mobility;
stifle and hock overextend
quadriceps contracture
what is the treatment for quadriceps contracture?
- surgical release of adhesions
- muscle/tendon lengthening if necessary
- passive and active physiotherapy
- 90-90 bandage postoperatively
what is the classification of bone graft?
donor and recipient is same individual
autograft
what is the classification of bone graft?
donor and recipient are different animals of the same species
allograft
what is the classification of bone graft?
demineralized bone matrix
biomaterials
what is the classification of bone graft?
ex: ceramics, bioglass
synthetic bone substitutes
name 4 properties of an ideal bone graft
- osteogenic
- osteoinductive
- osteoconductive
- non-immunogenic
this property of an ideal bone graft means it is a source of osteoblasts to fracture site
osteogenic
this property of an ideal bone graft means it induces migration and differentiation of mesenchymal stem cells from remote site
osteoinductive
this property of an ideal bone graft means it is a scaffold in which bone can develop
osteoconductive
what are 2 uses for bone grafts
- filling defects
- to encourage healing
name 4 places you can collect a cancellous autograft from
- lateral tuberosity of humerus
- medial proximal tibia
- greater trochanter of femur
- wing of ileum
name 3 advantages of cancellous autograft
- no immune response
- greatest osteogenic effect (high cellularity)
- no risk of cross infection
name 2 disadvantages of cancellous autograft
- extra operating sites must be prepped and accessed
- large quantities can be difficult to obtain
name 3 advantages of cortical allograft
- can be banked
- convenient
- unlimited quantity
name 3 disadvantages of cortical allograft
- immunogenic
- slow incorporation into host bone
- risk of cross infection
where do primary tumors of the musculoskeletal system originate from?
mesenchymal cells
(sarcoma)
what does an osteosarcoma originate from
bone
what does a soft tissue sarcoma, fibrosarcoma, myxosarcoma originate from
connective tissue
what does a haemangiosarcoma originate from
blood vessels
what do rhabdomyosarcomas originate from
striated muscle
what do leiomyosarcomas originate from
smooth muscle
what do liposarcomas originate from
fat
what do chondrosarcomas & synovial cell sarcomas originate from
cartilage
name 3 musculoskeletal sarcomas with a higher risk of metastasis (>90%)
- osteosarcoma
- haemangiosarcoma
- histiocytic sarcoma elsewhere (NOT around the joint)
name 5 musculoskeletal tumors with a lower risk of metastasis (<40%)
- peripheral nerve sheath tumor (PNST)
- Fibrosarcoma (FSA) / soft tissue sarcoma (STS)
- Histiocytic sarcoma around the joint
- chondrosarcoma
- feline injection site sarcoma
Stage vs. Grade
This is the extent of the tumour: how far has it got?
clinical assessment of current disease burden
Stage
Stage vs. Grade
This is based on the histological features of the tumor;
mitotic activity, vascularity, invasion, necrosis, differentiation
Grade
name 1 pro and 1 con of using incisional biopsy and histology to diagnose a primary sarcoma in the musculoskeletal system
Pro: large sample so better chance of diagnosis and accurate grade
Con: requires GA
name 1 pro and 1 con of using tru-cut biopsy to diagnose a primary sarcoma in the musculoskeletal system
Pro: may be possible under sedation
Con: small sample so chance of non-representative sample - diagnosis or grade
what is the preferred type of imaging for musculoskeletal primary tumors
MRI or CT
(radiograph is rel. insensitive)
all sarcomas have a predilection for metastasis to what organ?
lungs
name 2 clinical signs of an osteosarcoma
- pain and lameness
- swelling/mass at primary site
name 5 differentials for bone tumors
- osteosarcoma!
- chondrosarcoma
- histiocytic sarcoma
- other (fibrosarcoma, haemangiosarcoma, etc)
- benign tumors/cysts
name 4 primary treatment options for an osteosarcoma
(to prevent pain, stop or delay progression of tumor)
- amputation!
- limb sparing (high risk of infection and failure)
- radiotherapy
- analgesia only
what is the best chemotherapy protocol to slow development of metastatic disease from an osteosarcoma?
carboplatin
what is the median survival for a dog with an osteosarcoma after amputation alone?
5 months
what is the median survival for a dog with an osteosarcoma after amputation and platinum chemotherapy?
9-12 months
name 4 possible toxicities caused by Carboplatin
- GI toxicity
- Myelosuppression
- nephrotoxicity
- mild GIT side effects
name 3 prognostic factors for osteosarcoma
- location
- presence of metastatic disease
- total alkaline phosphatase
where is an osteosarcoma most likely to occur in dogs
front limbs
(appendicular skeleton - metaphysis of long bones)
what are the ideal surgical margins for soft tissue sarcomas
3 cm lateral and 1 fascial plane beyond extent of tumour
name 3 methods of sample preparation for margin assessment of soft tissue sarcomas
- cardinal (most common)
- bread loafing
- shaved margins
name the sample prep method for margin assess. of soft tissue sarcomas
3 sections;
relies on mass being spheroid (not always true)
cardinal
metronomic chemo to treat microscopic residual disease from a soft tissue sarcoma is well tolerated but what is the main risk?
sterile haemorrhagic cystits
name 4 prognostic factors of soft tissue sarcomas
- tumour grade and mitotic rate
- tumour size
- tumour location
- achieving local control of tumour
what organ is most commonly affected by haemangiosarcomas
spleen
name 3 clinical signs of a haemangiosarcoma
- shock, collapse, haemoabdomen
- palpable mass or fluid thrill on spleen
- intramuscular bruising
name 2 poor prognostic factors of a haemangiosarcoma
- tumour rupture and bleeding into abdomen
- metastases
what is the typical survival for splenic tumors with metastasis
4-6 weeks
what category of chemodrug is Doxorubicin and Epirubicin
antitumour antibiotic
name 8 toxicities that may be caused by Doxorubicin and Epirubicin
- SEVERE perivascular irritant
- anaphylaxis (premed w chlorpheniramine)
- acute/cumulative cardiotoxicity
- nausea
- GI effects
- Myelosuppression
- nephrotoxicity
- alopecia
when should an echocardiogram be performed when giving Doxorubicin or Epirubicin to a patient
prior to first & third or fourth treatment
what type of haemangiosarcomas have an excellent outcome and mean survival time (MST) of 1000 days
dermal HSA
how are the best outcomes achieved for a histiocytic sarcoma
multi-modal therapy
(surgery, radiation, & lomustine/anthracycline chemo)
the synonym of this is Degenerative joint disease;
it affects the diarthrodial joints
osteoarthritis (OA)
what 3 things is osteoarthritis (OA) charcterized by?
- degeneration of cartilage
- periarticular new bone and fibrosis
- low grade inflammation
what are 2 possible pathogeneses for osteoarthritis (OA)
- abnormal motion on normal cartilage
- normal motion on abnormal cartilage
name 5 clinical findings/signs of ostearthritis (OA)
- lameness
- pain
- reduction in normal movement
- effusion
- crepitus
name three signs of osteoarthritis (OA) seen on radiographic imaging
- osteophytosis
- sclerosis
- effusion
name 4 signs of osteoarthritis seen arthrocentesis investigations
- incr. or decr. volume
- reduced viscosity
- incr. white blood cells
- pred. mononuclear
what nutritional supplement can be given to treat osteoarthritis (OA) with unequivocal evidence of efficacy
Omega-3 Fatty Acids
40% of older cats with osteoarthritis (OA) also have this disease
kidney disease
what two options are there for surgical management of osteoarthritis (OA)?
- arthroplasty
- arthrodesis (NOT hip)
what is a synonym for bacterial infective arthritis
septic arthritis
name 5 signs of bacterial infective arthritis seen with arthrocentesis investigations
- large volume
- abnormal appearance
- incr. cell count
- neutrophilia
- culture
what is Lyme disease caused by?
Borrelia burgdorferi,
transmitted by Ixodes ticks
what is the treatment for Lyme disease?
Tetracyclines
SKIPPING 8
COME BACK TO IT
name 5 differential diagnoses for multiple limb lameness in immature dogs/cats
- craniomandibular osteopathy
- nutritional secondary hyperparathyroidism
- panosteitis
- metaphyseal osteopathy
- vaccine reactions
name 5 differential diagnoses for multiple limb lameness in adult dogs/cats
- immune mediated joint disease
- drug induced polyarthritis
- renal secondary hyperparathyroidism
- hypervitaminosis A
- hypertrophic osteopathy
name the pathogenesis of craniomandibular osteopathy
- lamellar bone production
- occipital bones/tympanic bullae/mandible
- +/- long bones
what is the clinical sign of craniomandibular osteopathy
(young dogs - 5-7 months)
pain on opening mouth +/- limb swelling
excess of this mineral impairs endochondral ossification
calcium
puppies and kittens fed this type of diet are more prone to nutritional secondary hyperparathyroidism
all meat diets
name 4 features of nutritional secondary hyperparathyroidism
- low calcium:phosphate ratio
- increased parathyroid hormone
- calcium resorbed from skeleton
- osteopenia (pathological fractures)
what breeds are more prone to panosteitis?
large breeds (GSD)
(rare in cats)
what sex is panosteitis more common in
males
name 3 clinical signs of panosteitis
- waxing and waning lameness
- can be non-weight bearing
- pain on bone palpation
name 3 radiographic signs of panosteitis
- medullary opacity
- occassional periosteal bone
- weeks to develop
what is teh treatment for panosteitis
- analgesia
- self resolves in adulthood
what is metaphyseal osteopathy characterized by
severe metaphyseal inflammation
what age, breed, and sex is metaphyseal osteopathy more common in?
(can occur in both dogs and. cats and any breed though)
young (4-6 month),
giant breeds,
male
name 4 clinical signs of metaphyseal osteopathy
- very painful
- pyrexic
- shifting lameness
- gross metaphyseal swelling
name 2 radiographic findings with metaphyseal osteopathy
- metaphyseal radiolucency, parallel to physis
- periosteal mineralization
metaphyseal osteopathy usually resolves in 7-10, but what is the exception to this?
hip in cats
name 2 clinical signs seen with vaccination reactions
- pyrexia
- stiff, panful, swollen joints
how long after primary vaccination course are vaccination reactions usually seen
2-7 days
what are 2 sub-classifications of immune mediated joint disease
- erosive
- non-erosive
what is the pathogenesis of immune mediated joint disease
- inappropriate immune response in synovium
- pain and lameness
name 2 genetic risks for immune mediate joint disease
- major histocompatability complex genes
- terrier breeds
name 4 signs of immune mediated joint disease found on clinical examination
- joint effusion, distal joints
- multiple joints affected
- symmetrical joint swelling
- overt joint pain
what changes will be seen in synovial fluid analysis for immune mediated joint disease
- increased volume
- reduced viscosity
- turbid (raised cell count)
- neutrophilic cytology
what is the treatment for immune mediated joint disease?
Prednisolone (immunosuppression)
what 3 immunosuppressive drugs can be used to treat immune mediated joint disease if the animal does not respond to Prednisolone?
- Chlorambulcil
- Azathioprine (NEVER IN CATS)
- Leflunomide/Ciclosporin
what is a common example of an erosive form of immune mediated joint disease
Rheumatoid arthritis (rare)
what is the most common form of immune mediated joint disease
idiopathic immune mediated polyarthritis (IMPA)
(non-erosive)
name 4 subgroups of idiopathic immune-mediated polyarthritis (IMPA)
- no association
- reactive - infection
- enteropathic
- neoplastic
what 3 drugs most commonly cause drug-induced polyarthritis
- Cephalosporins
- Penicillins
- Sulphadiazine-trimethoprim (Dobermans)
name 5 clinical features of renal secondary hyperparathyroidism
(chronic renal insufficiency)
- reduced glomerular filtration rate
- reduced renal excretion of phosphorus
- reduced calcitriol
- increased parathyroid hormone
- osteopenia - pathological fractures
what is “rubber jaw” caused by?
renal secondary hyperparathyroidism
what is the treatment for renal secondary hyperparathyroidism
- reduced phosphate diet
- oral phosphate binder
- vitamin D
cats fed liver rich diets can develop this disease causing limb lameness
hypervitaminosis A
name 3 clinical signs of hypervitaminosis A
- stiff, lame, unkempt appearance
- neurological defecs
- excessive spinal new bone, even fusion
name 3 synonyms for hypertrophic osteopathy
- hypertrophic pulmonary osteoarthropathy
- hypertrophic pulmonary osteopathy
- Marie’s disease
what is the radiographic sign of hypertrophic osteopathy
periosteal new bone
(any limb bone)
what is the main cause of hypertrophic osteopathy
thoracic mass neoplasia
name 5 differential diagnoses for forelimb lameness in the immature dog and cat
- carpal laxities
- elbow dysplasia
- incomplete ossification of the humeral condyle (IOHC)
- developmental luxation
- osteochondritis dissecans
what are 3 causes of carpal laxity in puppies and kittens
- period of rest
- casting
- poor nutrition
what is the treatment for carpal laxity
exercise / balanced diet
(spontaneously resolves)
what causes flexural deformity of the carpus?
contracture flexor carpi ulnaris
Elbow dysplasia is a group of what 3 developmental conditions of dogs?
- fragmented coronoid process (FCP)
- Osteochondritis dissecans of the medial part of humeral condyle (OCD)
- ununited anconeal process (UAP)
what sex is predisposed to fragmented coronoid process (FCP) - (elbow dysplasia)
males
what is a grade 0 elbow dysplasia
no osteophytosis
what is a grade 1 elbow dysplasia
osteophytes < 2mm
what is grade 2 elbow dysplasia
osteophytes 2-5mm or lesion
what is grade 3 elbow dysplasia
osteophytes >5mm or lesion with osteophytes
how old mus t a dog be in order to have elbow dysplasia scored
1 year
what is the most common form of elbow dysplasia
fragmented coronoid process (FCP)
what signs will be seen on clinical examination for fragmented coronoid process (FCP)
pain on extension and flexion/supination
fragmented coronoid process (FCP) is frequently bilateral or unilateral?
bilateral
what 3 surgical treatments can be done for fragmented coronoid process (FCP)
- arthrotomy or arthroscopy
- fragment removal
- ulna/humeral osteotomy
this is the failure of endochondral ossification
osteochondrosis
name 3 aetiologies of osteochondritis dissecans (OCD) of the medial part of the humeral condyle
- genetics
- “over nutrition”
- ischemia
how to diagnose osteochondritis dissecans (OCD) of the medial part of the humeral condyle
radiography
what is the treatment for osteochondritis dissecans (OCD) of the medial part of the humeral condyle
surgical removal of the flap
name 4 signs seen on clinical examination with ununited anconeal process
- crepitus
- marked effusion
- pain on extension
- 25% bilateral disease
how to diagnose ununited anconeal process?
radiography
(flexed mediolateral view)
how to treat ununited anconeal process ?
- osteoarthritis management
- surgical removal
- surgical fixation
what is the treatment for incomplete ossification of the humeral condyle?
transcondylar position screw
name two ways to diagnose shoulder osteochondrosis
- radiography (radiolucent deficit)
- positive contrast arthrogram
what is the surgical treatment for shoulder osteochondrosis
flap removal / abrade surface
name 6 differential diagnoses for hind limb lameness
- osteochondritis dissecans of the talus
- medial patellar luxation
- lateral patella luxation
- Avascular necrosis
- hip dysplasia
- panosteitis
what 2 presenting signs will a dog with osteochondritis dissecans of the talus
- marked hind limb lameness
- marked effusion/swelling
what 3 things can be done to diagnose osteochondritis dissecans of the talus
- radiography
- CT
- arthrocentesis (degenerative cytology)
what radiographic sign will be seen with osteochondritis dissecans of the talus
medial trochlear ridge appears absent
what is the treatment for osteochondritis dissecans of the talus
- fragment removal
(arthrotomy/arthroscopy technically challenging)
what is the prognosis for osteochondritis dissecans of the talus
guarded
(some require arthrodesis)
name 3 causes of medial patella luxation
- developmental
- complication of cruciate rupture
- trauma
name the grade of medial patella luxation
in sulcus, and spontaneously returns in sulcus when manually luxated
grade 1
name the grade of medial patella luxation
when in sulcus, stays in;
when out of sulcus, stays out
grade 2
name the grade of medial patella luxation
when out of sulcus, can be returned in, but spontaneously luxates out
grade 3
name the grade of medial patella luxation
out of sulcus all the time, can’t be put in
grade 4
what is the treatment for an asymptomatic dog with medial patella luxation
no treatment
what is the treatment for a symptomatic dog with medial patella luxation
surgical treatment
(realign patella mechanism)
name 4 possible surgical methods to treat medial patella luxation and realign patella mechanism
- lateral tibial tuberosity transposition
- trochlear wedge/block recession sulcoplasty
- medial desmotomy
- lateral capsular overlap
what is the prognosis for dogs with grade 1-3 medial patella luxation
excellent
what is the prognosis for dogs with grade 4 medial patella luxation
guarded
(may require corrective osteotomy)
what breeds is lateral patella luxation more common in
large breeds
(flat coat retrievers )
what breeds is medial patella luxation more common in
small/toy breeds
what are the two surgical treatments for lateral patella luxation
- medial tibial crest transposition
- trochlear wedge/block sulcoplasty
this disease is ischaemic necrosis of the femoral head
Legg-Calve-Perthe’s disease
what breeds is Legg-Calve-Perthe’s disease more common in
small, toy breeds
(dogs)
what will the clinical history of a dog with Legg-Calve-Perthe’s disease be?
- progressively deteriorating lameness
- marked hip pain
(3-12 months of age)
what 2 signs of Legg-Calve-Perthe’s disease can be seen on radiography for diagnosis
- lysis/mottling femoral head/neck
- femoral head collapse
2 ways to surgically treat Legg-Calve-Perthe’s disease
- femoral head + neck ostectomy
- mini total hip replacement
what is the prognosis for Legg-Calve-Perthe’s disease
good outcome with surgery
what sex is metaphyseal osteopathy of cats more common in
male
(< 2 years old)
what radiographic sign will be seen to diagnose metaphyseal osteopathy of cats
radiolucent line across femoral meaphysis
(fracture in 50% cases)
name 2 surgical treatments for metaphyseal osteopathy of cats
- femoral head and neck excision
- total hip replacement
what is the prognosis for metaphyseal osteopathy of cats treated surgically
excellent
what two things make up the temporomandibular joint
- mandibular condyles
- temporal bone
what are the two treatment options for luxation of the temporomandibular joint
- closed reduction
- open reduction and loose muzzle (4 weeks)
how will a dog with luxation of the temporomandibular joint present
unable to close mouth
name 5 common differential diagnoses for forelimb lamness in mature cat/dog
- luxation/subluxation injury of carpus
- collateral ligament injury
- incomplete ossification of humeral condyle
- fragmented medial coronoid process
- traumatic luxation of elbow
name 3 causes of carpal luxation or subluxation
- trauma (common)
- chronic immune mediated polyarthritis (rare)
- chronic degeneration (rare)
what are the 2 presenting signs of carpal luxation or subluxation
- palmargrade stance (hyperextended)
- mild-moderate lameness
how to diagnose carpal luxation or subluxation
radiography / stress radiography
(identify joint)
how to treat carpal luxation or subluxation in puppies
medically!
should spontaneously resolve, no surgery
how to treat carpal luxation or subluxation in an adult
surgical management
(pancarpal arthrodesis)
name the 4 principles/steps of arthrodesis to treat carpal luxation or subluxation
- remove all articular cartilage
- cancellous bone graft
- rigid internal fixation (plate)
- coaptation (splint/cast) (not always used)
what is the prognosis for an adult with carpal luxation or subluxation that has had pancarpal arthrodesis
excellent (80%)
what are 2 possible complications of treating carpal luxation or subluxation with pancarpal arthrodesis
- failure of arthrodesis
- metacarpal fracture
what is the presenting sign for adult animals with carpal collateral ligament injury
normal stance with slight valgus
how to diagnose carpal collateral ligament injury
- palpation
- stress radiography
name 2 surgical treatment options for carpal collateral ligament injury
- APL transposition
- prosthetic - screw/bone tunnels
what breed of dog is predisposed to incomplete ossification of the humeral condyle (IOHC)
spaniels
what is a synonym for incomplete ossification of the humeral condyle (IOHC)
Humeral Intercondylar Fissure (HIF)
name the 3 possible fractures that dogs with incomplete ossification of the humeral condyle (IOHC) are predisposed to
- lateral part of condyle
- medial part of condyle
- di-condylar (‘Y’ or ‘T’)
how to treat an adult dog with incomplete ossification of the humeral condyle (IOHC) alone
position screw
how to treat an adult dog with incomplete ossification of the humeral condyle (IOHC) AND a lateral OR medial condyle fracture
lag screw and plate fixation
how to treat an adult dog with incomplete ossification of the humeral condyle (IOHC) AND a dicondylar fracture
lag screw and double plate fixation
what is the prognosis for a dog treated for incomplete ossification of the humeral condyle (IOHC)
good (for return to normal function)
WILL develop elbow osteoarthritis
what to look for on diagnostic imaging when diagnosing traumatic elbow luxation
avulsion fragments
how to medically manage traumatic elbow luxation
- closed reduction
- check collaterals
- dressing 2 weeks
Pronation checks (medial or lateral?) collaterals
medial
Supination checks (medial or lateral?) collaterals
lateral
how to surgically treat traumatic elbow luxation
- open reduction
- re-attach avulsion
- replace ligaments
name 2 elbow salvage procedures
- elbow arthrodesis
- total elbow replacement
what angle should the elbow be fused at in elbow arthrodesis
110 degrees with a caudal plate
this disease is rare in dogs and very rare in cats;
there will be pain on biceps test (palpation on hsoulder flexion);
diagnosed on ultrasound
biceps tendon disease
(tenosynovitis or traumatic rupture)
name 8 differential diagnoses for hindlimb lameness in the adult dog/cat
- ligament injuries
- shear injuries
- Achilles tendon injuries
- cranial cruciate ligament disease
- collateral ligament rupture
- patella tendon rupture
- coxofemoral luxation
- hip dysplasia
(many more)
how to manage ligament injuries of the hock in a mature dog/cat?
- treat wounds appropriately
- external skeletal fixation
- pins and tension band
what is the prognosis for managed ligament injuries of the hock in a mature dog/cat?
good;
development of osteoarthritis
what 3 Achilles Tendon injuries can a mature dog/cat have?
- tendinosis
- partial rupture
- complete rupture (trauma)
thickening, but no lengthening would indicate this Achilles tendon injury in a mature dog/cat
tendinosis
lengthening & flexed (‘clenched’) digits would indicate this Achilles tendon injury in a mature dog/cat
partial rupture
plantigrade stance would indicate this Achilles tendon injury in a mature dog/cat
complete rupture (trauma)
how to treat Achilles tendon tendinosis (no lengthening) in a mature dog/cat
medical management
how to treat partial rupture of Achilles tendon (lengthening) in a mature dog/cat
temporary immobilization/repair or salvage
how to treat complete rupture of Achilles tendon in a mature dog/cat
primary repaire (surgery)
name 2 instances where pantarsal arthrodesis is used as treatment in a mature dog/cat
- end-stage talocrural joint osteoarthritis
- failed Achilles mechanism injury
name 5 functions of the cranial cruciate ligament
- limit cranial translation
- limit internal rotation
- limit valgus/varus motion
- limit stifle extension
- proprioception
what 4 clinical signs will be seen on clinical examination in a mature dog/cat with cranial cruciate ligament rupture
- stifle effusion
- stifle thickening (medially)
- muscle atrophy (bilateral)
- pain on full extension
name 2 radiographic signs of cranial cruciate ligament rupture
- effusion
- osteophytosis
describe extracapsular stabilization (lateral fabella-tibial suture LTFS) for a cranial cruciate ligament rupture
- tibial tunnel
- under patella ligament
- around lateral fabella
name 3 tibial osteotomies for dunamic stabilization of a cranial cruciate ligament rupture
- tibial plateau levelling osteotomy (TPLO)
- tibial wedge osteotomy (TWO)
- Tibial tuberosity advancement (TTA)
which technique of stabilization is preferred for cranial cruciate ligament rupture
TPLO
(tibial plateau leveling osteotomy)
name 2 issues with dynamic stabilization for cranial cruciate ligament rupture
- costs increased
- complications challenging
what is the most important orthopaedic condition?
cruciate ligament disease
name 3 steps to diagnos a collateral ligament injury
- varus and valgus stress test
- confirm with stress radiographs
- check integrity of cruciate ligaments
what is the treatment for collateral ligament injury in a mature dog/cat
- primary repair (if possible)
- supplement - screws and suture
name 5 ligaments that may be involved in a multiple ligamentous injury (often all are injured)
- medial collateral ligament
- lateral collateral ligament
- cranial cruciate ligament
- caudal cruciate ligament
- menisci
what is the treatment for multiple ligamentous injury in a mature dog/cat
- repair/replace individual components
- transarticular external skeletal fixation
what is the prognosis for isolated collateral injuries
excellent
what is the prognosis for multiple ligament injuries
moderate
(expect lameness, DJD progresses)
how is the patella displaced in a patella ligament rupture?
proximally displaced
(from forced flexion - quad muscles)
what 3 places should you palpate to diagnose hip luxation in a mature dog/cat
- ilial wing
- trochanter
- tuber ischia
name 3 medical treatments for hip luxation in a mature dog/cat
- closed reduction
- cage rest
- support (Ehmer sling, hobbles)
what support can be used for a cradiodorsal hip luxation that has had closed reduction
Ehmer sling
what support can be used for a caduoventral hip luxation that has had closed reduction
hobbles
name the surgical treatment of choice for hip luxation
iliofemoral suture
(base of trochanter to iliopubic eminence)
how to diagnose hip dysplasia in a mature dog/cat?
- Ortolani test (angle of reduction - young only)
- Radiographs (hip laxity in young; hip osteoarthritis in old)
how to medically manage a mature dog/cat with hip dysplasia
osteoarthritis management
(weight, analgesia, acitivty control, etc)
2 ways to surgically manage hip dysplasia in a juvenile dog
- Juvenile pubic symphysiodesis (<5mo)
- pelvic osteotomy (<12mo)
name 2 ways to sugically manage hip dysplasia in an adult dog
- femoral head and neck ostectomy (juvenile and adult)
- total hip replacement (adult)