Musculoskeletal Flashcards
disruption in musculoskeletal system may be
trauma, degenerative disease, inflammation, poor conformation, neoplasia
etiology of long bone fractures
trauma, disease, repeated stress
classification of long bone fractures
open or closed (pierce the skin or not)
simple or comminuted (single break or multiple small breaks)
stable or unstable
transverse fracture
break straight across bone
oblique fracture
diagonal break
spiral fracture
creates spiral up the bone
comminuted fracture
multiple breaks creating shards of bone
avulsion fracture
break at the epiphysis
impacted fracture
2 pieces of bone pushing together at site of break
fissure fracture
break along long axis of bone
greenstick fracture
break that does not go through bone
Dx of long bone fractures
radiographs, at least 2 views
Tx for long bone fractures
fixation (stabilization)
how do bones heal?
hematoma, fibrocartilaginous (soft) callus, bony (hard) callus, remodeling
splints and casts
used to stabilize fracture, ideal for simple fractures, must be adequately padded and must be kept dry (must be replaced regularly for puppies)
intramedullary pins (IM pins)
provides fracture site rigidity, prevent forces of bending/rotation, must be placed in sterile environment, not recommended for forelimbs
bone plates
provide stabilization for most fractures, should be removed but sometimes kept in place
external skeletal fixation
multiple pins and external bars holding bones in place, good for complex fracture sites
client education for fractures
restrict activity, leash walks for 6-8 weeks, surgical site care, follow up RADs, additional surgery may be necessary
what is a cruciate ligament
ligaments which stabilize the knee, create an X pattern at the femur and tibia
cruciate ligament injury is the ______ ______ injury to stile of dog
most common
cruciate ligament injury may be
partial tear or complete rupture
cruciate ligament injury can cause
secondary diseases (DJD)
signalment for cruciate ligament injury
seen in middle aged, obese, inactive animals (can affect all dogs of all sizes)
dogs with higher chances of CLI
rotties, newfies, staffies, mastiff, akita, st bernard, CB retrievers, labs
Dx for cruciate ligament injury
clinical signs, lameness, gait change, rads
cranial drawer test
tibia slides forward over femoral condyles (usually done with sedation)
tibial compression test
tibia slides forward over femur while hock is flexed
Tx for cruciate ligament injury
meds (anti-inflammatory) physical therapy, braces
client education for cruciate ligament
contralateral limb will most likely also be affected, Sx to fix ruptured ligament, activity restriction, weight loss
patellar luxation
patella pops out of place either medially or laterally
medial luxation
toy, mini, and large breeds
lateral luxation
toy and mini breeds, large or giant breeds
most common orthopedic condition in dogs
patellar luxation
small breeds predisposed to patellar luxation
boston terrier, yorki, chihuahua, poms, mini poodles
large breeds predisposed to patellar luxation
shar pei, flat coated retrievers, akitas, great pyrenees
Tx for patellar luxation
may need Sx, activity restriction, anti-inflammatories, chondroprotectants
genetic/hereditary disease in large breed dogs
hip dysplasia
what is hip dysplasia
disease of ball and socket joint due to abnormal acetabulum or femoral head
clinical signs for hip dysplasia
young animals slow to rise, older dogs may have muscle atrophy
Dx hip dysplasia
RADs
hip dysplasia is ______ so older animals cannot get this unless born with it
congenital
Tx hip dysplasia
Sx (total hip replacement or femoral head ostectomy) hip and joint sups
client education for hip dysplasia
OFA recommendations, weight loss, progression/degenerative, Sx is only cure
Legg-Perthes Disease (avascular necrosis)
loss of blood supply to femoral head which may cause trauma to hip
signalment for LPD
small young breeds (terriers)
clinical signs for LPD
reduced hip mobility, lack of muscle mass, limb shortening, pet becomes irritable
Dx of LPD
RADs
Tx for LPD
Sx (femoral head ostectomy)
osteochondrosis dissecans
abnormal development of cartilage at end of bone in the joint
most common joints of osteochondrosis dissecans
shoulder, elbow, hip, knee
signalment for osteochondrosis dissecans
rapidly growing medium to large dogs typically between 6-9 mo of age
Dx of osteochondrosis dissecans
RADs reveal loose cartilage flap or “joint mouse”, arthroscopic exam
Tx osteochondrosis dissecans
rest, weight control, Sx
panosteitis
painful inflammation of outer surface or shaft of one or more long bones (growing pains)
clinical signs of panosteitis
shifting leg lameness, occurs suddenly and spontaneously
signalment of panosteitis
young, rapidly growing dogs
predisposed breeds for panosteitis
goldens, GSD, great danes, labs, rotties, dobies, bassets
which sex does panosteitis affect more
males
Dx panosteitis
RADs
Tx panosteitis
anti-inflammatory drugs
coxofemoral luxations
tearing of joint capsule and round ligament
etiology coxofemoral luxations
trauma, poor conformation
clinical signs coxofemoral luxations
Hx, acute lameness, swelling
Dx coxofemoral luxations
RADs
Tx coxofemoral luxations
closed or open reduction, consider other organ systems affected
client education coxofemoral luxations
rest, FHO
bacterial myositis
bacterial infection of bite or puncture wound (Staphylococcus, Clostridium)
Tx for bacterial myositis
antibiotics
protozoal myositis
toxoplasma encysted within muscles of + cats
Tx of protozoal myositis
antiprotozoal
polymyositis
immune-mediated condition that causes depression, lameness, weakness, fever
Tx of polymyositis
steroids
masticatory myositis
involves muscles of mastication
Tx of masticatory myositis
steroids
feline polymyopathy
hypokalemia causes ventral neck flexion
Tx feline polymyopathy
K+ supplement
most common neoplasia
osteosarcoma
commonly affected sites for neoplasia
distal radius, proximal humerus, distal femur, prox tibia
signalment for neoplasia
large breed male dogs over 7
Dx neoplasia
RADs, Bx
Tx neoplasia
amputation, chemo
client education
amputation will not prevent metastasis, chemo is $$$ and has side effects
the equine foot
basically horse walking on middle finger
____ percent of horse lameness come from the hoof
90
diseases affected the hoof
subsolar bruise, abscess, navicular syndrome, thrush, fractures
etiology subsolar bruise
trauma that causes hemorrhage
clinical signs of subsolar bruise
chronic, low-grade lameness
Dx subsolar bruise
hoof testers, visualizing the bruise
Tx and prevention subsolar bruise
proper trimming and shoeing
etiology of hoof abscess
bacteria within hoof capsule
signalment of hoof abscess
horses with foreign body penetration
clinical signs of hoof abscess
fever, acute lameness, increased digital pulse, fetlock and pastern swelling
Dx of hoof abscess
visualize draining tract, RADs
Tx hoof abscess
pare out abscess, anti-inflammatory, foot soaks, antibiotics, +/- tetanus
navicular disease etiology
inflammation of navicular bursa, excessive strain on tendons, improperly trimmed hooves
signalment for navicular disease
6-8 yr, quarter horses and thoroughbred
clinical signs of navicular disease
pointing, pain over frog, chronic, bilateral lameness
Dx navicular disease
digital nerve block, RADs
Tx navicular disease
NSAIDS, correct hoof imbalance, suspensory ligament desmotomy
etiology of thrush
bacterial infection of frogs, wet conditions
bacteria of thrush
Fusarium necrophorum
clinical signs of thrush
foul smelling black discharge from frog
Tx for thrush
clean feet, remove necrotic material, topical astringents
client education for thrush
husbandry, keep feet clean
sidebones
ossification of collateral cartilage found on either side of hoof protruding past coronary band
etiology of sidebones
trauma
signalment for sidebones
draft horses, older horses
Dx of sidebones
rads
Tx of sidebones
rest, NSAIDS, immobilize foot
proximal sesamoid fractures
just know that they exist
signalment for sesamoid fractures
high athletic horses, performance horses
Tx for sesamoid fractures
Sx removal, internal fixation, rest up to a year
sesamoiditis
inflammation of the sesamoid bones due to high stress/impact
signalment of sesamoiditis
racehorses, dressage horses
Dx of sesamoiditis
rads
Tx of sesamoiditis
NSAIDS, rest
bucked shins
painful periostitis, on cranial surface of metacarpal and metatarsal bones
signalment of bucked shins
forelimbs of young thoroughbreds
clinical signs of bucked shins
warm, painful swelling, lameness
Tx for bucked shins
rest, NSAIDS, decrease training
prevention bucked shins
modify exercise and training
splints
inflammation of the splint bones
etiology of splints
mineral and vitamin imbalances (Ca, phos, vitamins A and D)
clinical signs of splints
swelling along cannon bone
Dx splints
rads
Tx splints
diet change, rest
laminitis (founder)
inflammation of sensitive laminae causes blood to pass dermal laminae, vasoconstriction causes laminae to separate from hoof wall
clinical signs of laminitis
pounding digital pulse, warmth, pain over toe
Dx laminitis
rads
Tx laminitis
NSAIDS, proper shoeing (high heel)
shoulder sweeny
damage to superscapular nerve, atrophy in shoulder muscle
etiology of shoulder sweeny
trauma
Tx of shoulder sweeny
steroids, NSAIDS, acupuncture, therapy laser
bog spavin
chronic synovitis of talocrural joint, distention of capsule
signalment of bog spavin
young horses
etiology of bog spavin
trauma
clinical signs of bog spavin
swelling of hock
Tx of bog spavin
rest, steroids, withdrawal of fluids
rhabdomyolysis
muscle fatigue, pain, or cramping associated with exercise
hyperkalemic periodic paralysis (HYPP)
inherited disorder that affects the sodium channels in muscle cells and ability to regulate potassium levels
clinical signs of HYPP
muscle trembling, prolapse of third eyelid, weakness, complete collapse
secondary hyperparathyroidism
aka big head, high potassium low calcium
clinical signs of big head
enlarged facial bones, spontaneous fractures, shifting leg lameness
Tx of big head
mineral balance
infectious footrot etiology
Dichelobacter nodosus
clinical signs of footrot
lameness, malodorous discharge, interdigital dermatitis
Tx of footrot
hoof trimming, cleaning, topical antiseptics
signalment for septic arthritis
neonates
etiology of septic arthritis
penetrating wound near joint, umbilical infection
clinical signs of septic arthritis
lameness, swelling, fever, anorexia
Dx septic arthritis
rads
Tx septic arthritis
antibiotics, joint lavage
prevention of septic arthritis
adequate colostrum, cleaning umbilicus
etiology of caprine arthritis encephalitis
retrovirus
signalment of CAE
goats under 6 months
transmission of CAE
mother to baby
clinical signs of CAE
chronic arthritis, swelling
Dx CAE
serology
Tx CAE
supportive
rickets and osteomalacia
malformation of bones due to lack of vitamin D, Ca, and phos
clinical signs of rickets
stiff gate, recumbency, enlarged costochondral junction
Dx for rickets
rads and labs
Tx for rickets
vit D injection, calcium and phos supplement
prevention of rickets
sunlight, proper nutrients
etiology of ergot toxicosis
ingestion of fungus Claviceps purpurea (infected feed)
pathogenesis of ergot toxicosis
vasoconstriction by direct action of the limbs of the arterioles and repeated injury
clinical signs of ergot toxicosis
distal limb discoloration, swelling, lameness
Dx ergot toxicosis
ID organism in feed
TX ergot toxicosis
remove animals from infected pasture or remove contaminated feed