Orthopedic Surgery Flashcards
subluxation definition
partial dislocation
fracture-dislocation definition
peri-articular fracture resulting in subluxation or dislocation of the joint
displacement definition
translation of the 2 fragments in relation to each other in one or more planes
angulation definition
2 fracture fragments are not aligned and an agular deformity is present
rotation definition
torsional relationship btw the 2 fracture fragments
what does this type of fracture say about the mechanism of injury: spiral
torsional
what does this type of fracture say about the mechanism of injury:avulsion
tension (eg. ACL tear)
what does this type of fracture say about the mechanism of injury: transverse
bending
what does this type of fracture say about the mechanism of injury: oblique
bending w/compression
what does this type of fracture say about the mechanism of injury: segmental/comminuted
high energy
Greenstick fracture
incomplete fracture involving the cortex of 1 side (tension side), most commonly seen in kids
Buckle/torus fracture
Buckling of the compression side of the cortex of a long bone
Salter-Harris fractures
fracture of the growth plate in kids
What are the types of salter-harris fractures?
I (S) - straight across the physis II (A) - above the physis III (L) - lower than the physis IV (T) - through metaphysis/physis/epiphysis V (R) - cRushed physis
Where are stress fractures the most common?
- 2nd metatarsal
- femoral neck
- proximal tibia
In which people do you see the most stress fractures?
- runners
- military recruits
- anorexic patients
Pathologic fractures can be 2/2 to ___(3)
- tumor/mets
- previously infected bone
- osteoporosis
What are the 5/6 P’s of compartment syndrome?
- Pain out of proportion to exam
- parasthesia
- pallor
- poikilothermia (inability to regulate core body temp)
- paralysis
- pulselessness (later finding)
compartment syndrome has pain with ______ stretch
PASSIVE
Tx of compartment syndrome
emergent fasciotomy
what happens to arteries that are injured?
- arterial injury rare becuase they usually slide out of the way
- damage to the walls leads to intramural hematomas that require vein grafts or prostheses
With what bone injuries are you most concerned about vascular trauma?
- clavicle
- supracondylar region of elbow
- femoral shaft
What vascular trauma do you worry about with supracondylar fractures of the elbow?
- damage to the brachial artery that could cause Volkmann’s contracture (compartment syndrome of the forearm causing ischemia/necrosis of the forearm muscles resulting in FLEXION OF THE WRISTS AND FINGERS)
What’s more common - nerve or vascular injury?
nerve
What are the 3 types of nerve injury from most likely to recover to least likely?
- neuropraxia - disruption of nerve function
- axonotmesis - anatomic disruption of the axonal sheath
- neurotmesis - anatomic disruption of the nerve itself
What nerve do you worry about injury to with the following injuries:
- humerus shaft fracture
- knee dislocation
- hip dislocation
- radial nerve
- peroneal nerve
- sciatic nerve, peroneal division
myositis ossificans definition. Where is it most common?
heterotopic bone forms within the damaged muscle which leads to the ossification of muscle
- quadriceps, brachialis
Where is the most likely damage to muscle/tendon (i.e., where in the muscloskeletal system) in the following age groups:
- kids
- adults
- elderly
- growth plate (physis)
- ligaments
- bones
describe the 3-step process of fracture healing
- vascular phase
- metabolic phase
- mechanical phase
Describe the vascular phase of bone healing
- hematoma development
- cellular infiltrate
- vascularization/organized hematoma
- soft callous formation
Describe the metabolic phase of bone healing
soft callous –> hard callous
Describe the mechanical phase of bone healing
mechanical stress is required to produce skeletal remodeling and solid bone
What are the orthapedic emergencies (6)
VC SCOreD
- fractures a/w Vascular injury
- Compartment syndrome
- Septic arthritis
- Cauda equina syndrome
- Open fractures
- Dislocation of major joints
what is a glycocalyx
can form on implants and provides substrate for colonization. It’s inaccessible to abx and culture
Tx of infection after fractures
- surgical debridement
- remove infected bone
- abx
in what bones do you see avascular necrosis
- head of the femur
- dome of the talus
- scaphoid
What is reflex sympathetic dystrophy?
- trivial trauma resulting in abnormal sympathetic tone
Describe complex regional pain syndrome
- exquisite pain
- erythema, swelling
- idiopathic cause
- often a/w minor trauma/surgery
Clavicular fractures:
- in whom are they most common
- how do you treat them
- kids, cyclists
- usually sling, figure 8 strap
- surgical tx if open, widely displaced, or a/w lower or ipsilateral fractures
How do you treat:
- simple proximal humerus fractures
- proximal humerus displacement
- sling, early range of motion (ROM)
- open reduction, internal fixation (ORIF)
Acromioclavicular separation:
- what is it injury of and how is caused
- in whom are these most common
- how do you treat them
- injury of acromaclavicular and coracoclavicular ligament 2/2 falling on acromion
- atheletes, football players
- sling + early motion
What type of shoulder dislocation is the most common?
- anterior
describe anterior shoulder dislocations, how are they treated?
- axillary nerve damage possible
- often recurrent
- tx: closed reduction + sling. Recurrent dislocations may need surgery
posterior shoulder dislocations are usually a/w _____. How are they treated?
- seizures, electrocution
- closed reduction + sling. Recurrent dislocations may need surgery
W/humeral shaft fractures check for _____ damage
- radial nerve
humeral shaft fractures are treated with
- closed treatment w/either hanging arm cast or functional (Sarmiento) brace
Distal humeral fractures have many complications such as ____ (4)
- nerve palsies
- posttraumatic arthritis
- heterotopic ossification
- stiffness
Distal humerus fractures are treated with _____(3)
- anatomic reduction
- stable fixation
- early motion
Supracondylar fractures are usually seen in ______ (what group) as a result of ____.
- kids
- monkey bar fall
What is a risk a/w supracondylar fractures
- injury to brachial artery causing Volkmann’s contracture
How do you treat supracondylar fractures?
- closed reduction
- cast for 4-6 wks
What is a Monteggia fracture/dislocation and how is it treated?
- ULNA fracture, RADIUS dislocation
- ORIF of ulna, closed reduction of radial head
What is a Galeazzi fracture/dislocation and how is it treated?
- RADIUS fracture, ULNA dislocation
- ORIF of radius and casting
Colles fracture
- definition,
- cause,
- popular age groups
- Classic findings
- treatment
- distal radius fracture
- FOOSH
- kids and elderly
- dorsal displacement of distal fragment, dorsal angulation, radial shortening
- closed reduction + cast (if stable); open reduction if fracture is intra-articular
Scaphoid fracture
- presentation
- tx
- high risk of….
- tenderness in anatomic snuffbox
- thumb-spica cast
- high risk of nonunion and AVN requiring OR for displaced fractures
Nightstick fracture
- definition
- results from
- Tx
- ulnar shaft fracture
- self defense with arm against a blunt object
- ORIF if significant displacement
Vertebral fractures
- tx if one vertebra is fractured (therefore stable)
- tx if 2-3 vertebra are fractured (therefore unstable)
- tx if nerve damage involved
- use brace
- surgery
- surgery
What is considered a stable pelvic fracture? How is it treated?
- one break in pelvic ring
- bed rest