Trauma and Orthopedics Flashcards
What are the steps to a joint examination?
Introduce Ask Look Feel Move Special Tests
When assessing the neurological functions of the limbs and trunk, what else do we need to assess?
Power
Co-ordination
Reflexes
Sensation
What is the difference between primary and secondary bone healing?
Primary does not produce a callus, and is due to fracture fragments being reduced anatomically - there is no movement between the fracture surfaces.
What are the 2 distinct but similtaneous processes occuring in secondary bone healing?
Intramembranous and endochondral ossification
What are the 2 stages of secondary bone healing?
- Haematoma and inflammation
2. Callus formation - soft and hard
What are Perkins rules?
Rules describing the length of time it takes for different fractures to unite
How long, according to Perkins rules, do cancellous/metaphyseal bone fractures take to unite?
6 weeks
How long, according to Perkins rules, do cortical/diaphyseal bone fractures take to unite?
12 weeks
How long, according to Perkins rules, do tibial fractures take to unite?
24 weeks
How long, according to Perkins rules, do fractures in children take to unite?
(Age of child + 1) weeks
Although should apply common sense in older children
What is delayed union of a fracture?
A failure of union to occur in 1.5 times the normal time for fracture union
What is non-union of a fracture?
A failure of union to occur in twice the normal time for fracture union
What are the 2 types of non-union?
Hypertrophic and Atrophic
Hypertrophic vs Atrophic non-union
H - non union due to excess mobility or strain at fracture site. Blood supply is good.
A - Due to poor blood supply (due to initial injury or surgical intervention)
What is a fracture?
A soft tissue injury with an associated broken bone
Considering the definition of a fracture, what principle should be used when treating a pt with one?
Treat the soft tissues with care and the broken bone will heal well
What are the 4 principles of modern fracture reduction and treatment?
- Reduce and fix fractures to restore anatomical relationships
- Stabilise with fixation or splinting as required
- Presvere the blood supply with the above gentle techniques
- Early and safe mobilization of the part and pt
What is the cheapest and easiest way to reduce a fracture?
Casting
What can we do to immobilise a fracture prior to definitive management?
Half casts, or back-slabbing
What are the complications of casting?
Cast problems (loosening, pressure areas) Thromboembolic events Coverage of wounds Skin breakdown Compartment syndorme
What injuries of the phalanges and metacarpals can occur?
Extra-articular - shaft fractures and base fractures
Dislocations - thumb MCPJ, PIP
Neck fracture (metacarpal)
How do thumb injuries usually occur?
Direct blow, or forced opposition
How do metacarpal injuries usually occur?
“punch” injury - Friday night, or boxers fracture
How do distal phalanx injuries usually occur?
Crush injury
How do proximal and middle phalanx injuries usually occur?
Direct blow, or twisting
PIP dislocation - What is the Edinburgh position, and why is it good?
MC joint immobilised in 90 degree flexion, and PIPJ in extension, and wrist at 30 degrees.
Ligaments are stretched to the max while immobile so the pt doesnt end up with a flexion deformity.
What is the mechanism of a scaphoid fracture?
Fall onto outstretched hand (forced dorsiflexion)
What is the sign of effusion in a scaphoid fracture?
Anatomical snuffbox feels full
Where is tender in a scaphoid fracture? 2 sites
- Anatomical snuffbox (dorsal)
- Tubercle of scaphoid (volar)
How do we investigate a ?scaphoid facture?
Scaphoid series radiograph films
How do we treat a scaphoid fracture?
Below elbow cast in neutral position for 8-12 weeks
If displaced >1mm or angulated -> Open reduction with internal fixation (ORIF)
What are the complications of scaphoid fracture?
- Non union
- Avascular necrosis (esp. with proximal or displaced fractures)
- Degenerative change
After scaphoid, what is the next most commonly fractured carpal bone?
Hamate fracture
How are distal radius and ulna fractures usually obtained?
Fall on an outstretched hand
How common are distal radius or ulna fractures?
Very - makes up 1 in 6 of all fractures
When I say that distal radius/ulna #s are bimodal in incidence, what do I mean?
There are 2 peaks of incidence, one in childhood (6-10) and one in early old age (60-70)
What can accompany #distal radius/ulna?
Scaphoid and ligamentous wrist injuries
What is a Colles fracture?
The most common radial fracture - the wrist and hand (i.e. all structures distal to the #) are displaced posteriorly
What is seen on examination of a colles fracture?
Dinner fork deformity - on lateral view of affected wrist, the posterior displacement of distal structures causes a curve like a fork to be seen on the palmar surface
What is a Smith’s fracture?
of radius that is the opposite of a Colles. The wrist and hand (i.e. all structures distal to the #) are displaced anteriorly
Having made you learn what Colles, Barton’s and Smiths #s are, what is the safest way to describe a #?
By radiological/anatomical features
What is a Barton’s fracture?
Intra-articular distal radius # with associated dislocation of radio-carpal joint. Can be volar or dorsal.
What are the characteristics that we can describe in a #?
Site - which bone, where in that bone? Pattern Displacement Angulation Dislocated/In joint
What is important to remember when looking at a radiograph of a #?
Theres should be 2 views!! AP and lateral
What # patterns can there be?
Transverse Oblique Spiral Comminuted Multi-fragmented Segmental
How can radial/ulnar shaft fractures be caused?
Fall on outstretched hand
Direct blow to forearm
What often happens if the ulna or radius is fractured on its own?
The other bone is dislocated
What do we call a proximal ulnar fracture with proximal radial head dislocation?
Monteggia fracture
What do we call a distal radial fracture with distal radio-ulna joint dislocation?
Galaezzi fracture
How are the vast majority of R/U shaft fractures managed in adults?
Above elbow cast if undisplaced.
If displaced - open reduction and compression plate fixation
Closed reduction is impossible/insufficient.
Where can the humerous fracture in adults?
Shaft
Condyles
Olecranon
Radial head
How do humeral shaft #s usually occur?
Fall with torsion or direct blow
What would we suspect if a humeral shaft # occured after a low energy blow?
Osteoporosis
What nerve is at risk from a humeral shaft fracture? Why?
Radial nerve - it runs down the radial groove on the posteroir aspect of the humerus
What else should we get x-rays of with a humeral shaft #? Why?
Joint above and below i.e. shoulder and elbow
In case of intra-articular extension/floating elbow/shoulder
If the radial nerve is involved in a humeral shaft #, what signs do we get?
Wrist drop
Sensory loss to dorsal aspect of lateral 3.5 digits
(depending on site) ?weakened extension of arm
How are humeral shaft #s usually managed?
Conservatively
When would surgical intervention be indicated for a humeral shaft #?
Open fracture
Vascular injury
Floating shoulder/elbow
Intra-articular extension
What can a pt do if they fall onto their elbow?
Humeral condylar #
What is the mechanism for humeral condylar #s?
Olecranon driven into the humerus -> condyle splits into “T” or “Y” shape
What is the most common type of humeral condylar #?
Intercondylar - fracture line goes from articular surface to supracondylar region (T or Y shape)
There are 3 other types of humeral condylar #. What are they?
- Supracondylar
- Isolated medial or lateral condyle fracture
- Isolated capitellum #
What is the Colton classification?
Classification of olecranon fractures according to whether it is displaced.
What is a type one and a type two colton fracture?
1 - undisplaced
2 - displaced
How can a radial head # occur?
FOOSH with the forearm in pronation
Which system do we use for radial head # classification?
Mason classification
What complications can occur as a result of elbow fractures?
Joint stiffness
Osteoarthritis
Heterotopic ossification
Neurovascular injury
What is the terrible triad of the elbow?
Posterior elbow dislocation w/ radial head fracture + coronoid process fracture + lateral collateral ligament tear
By what mechanism does the clavicle #?
Fall, or direct blow to lateral shoulder
What % of all #s do clavicle #s make up?
5-10%
Where do the majority of clavicle #s occur?
Middle 3rd (i.e. 2/3rds from sternum)
WRT displacement, how are clavicle #s assessed?
WRT the sternoclavicular joint
How are the majority of clavicle fracture treated?
Conservatively
How do most scapula #s occur?
Direct trauma, usually a RTA
What other injuries should be considered/ruled out when a scapula # is present?
- Rib #
- Pulmonary contusion
- Pneumo/haemothorax
- Ipsilateral clavicle #s
In the shoulder region, what can dislocate?
Sternoclavicular joint Acromioclavicular joint Glenohumeral joint (anterior or posterior)
Which shoulder dislocation is the most common?
Anteroir dislocation of glenohumeral joint - 95% of dislocations
Are sternoclavicular joint dislocations common?
Noop
Who is at risk of reoccuring shoulder dislocations?
Pts whos shoulder dislocates first at a young age
Why do shoulder dislocations reoccur?
Bankart lesions or capsular redundancy
When do single rib #s typically occur?
Direct injury such as a fall
Apart from trauma, when can lower ribs #?
With coughing