Dislocations

Question 1

most common dislocation

Answer 1

GHJ

Question 2

98% of GHJ dislocations are

Answer 2

anterior

Question 3

trauma mechanism that causes GHJ dislocation

Answer 3

severe external rotation and fall on elbow

Question 4

2 signs of axillary nerve palsy

Answer 4

badge patch numb and decreased deltoid function

Question 5

detachment of anterior labrum and shoulder capsule =

Answer 5

Bankart lesion

Question 6

in <20yo with GHJ dislocation __% redislocate so offer __

Answer 6

80

Sx stabilisation

Question 7

management of majority of GHJ dislocations =

Answer 7

3 wk sling -> physio

Question 8

mechanism of injury for posterior GHJ dislocation

Answer 8

posterior force on adducted and internally rotated shoulder

perhaps due to a seizure

Question 9

light bulb sign on xray

Answer 9

posterior GHJ dislocation

Question 10

ACJ dislocation mechanism of injury

Answer 10

fall onto shoulder

Question 11

Rx of ACJ dislocation

Answer 11

coracoclavicular lig intact = conservative

not = reconstruction

Question 12

possible complications of posterior sternoclavicular J dislocation

Answer 12

compress trachea, oesophagus, brachiocephalic vein

Question 13

Rx for posterior sternoclavicular dislocation =

Answer 13

reduce - clamp bone and pull

Question 14

empty cup sign =

Rx =

Answer 14

lunate with capitate not in it - perilunate dislocation

urgent reduction and wire stabilisation

Question 15

most common finger dislocation

common in __+__

Answer 15

dorsal PIPJ dislocation

rugby and cricket

Question 16

swan neck deformity if ___ disrupted

Answer 16

volar plate

Question 17

native hip dislocation often ass with ___ and sometimes ____

Answer 17

posterior acetabulum wall #

femoral head avulsion # from lig teres

Question 18

risks after native hip dislocation =

Answer 18

AVN (up to 2yrs later)

heterotrophic ossification

Question 19

Rx of native hip dislocation =

Answer 19

emergency reduction

may need internal fixation if # ass is large

Question 20

1st time hip replacement dislocation Rx =

Answer 20

closed reduction and knee splint (decrease hip flexion and ext rotation)

Question 21

___ hip replacement decreases ROM and dislocation rate but may need replaced sooner

Answer 21

constrained cup

Question 22

mechanism of lateral patellar dislocation

Answer 22

sudden quad contraction +/- direct blow

Question 23

predispositions to patellar dislocations

Answer 23

F
<20yo
ligament laxity
valgum
femoral neck anteversion
shallow trochlea

Question 24

Rx of patellar dislocations

Answer 24

reduce > 3 wk splint > physio

Question 25

recurrent patellar dislocations may mean need ___

Answer 25

MPFL reconstruction

Question 26

Risks ass with knee dislocation =

Answer 26

popliteal artery / common fibular nerve damage

compartment

Question 27

Rx of knee dislocation =

Answer 27

emergency reduction, externally fixate +/- revascularise

usually need multilig reconstruction

Question 28

subtalar dislocation usually displaces ___

high risk of ___

Answer 28

medially

AVN

Question 29

aviators astragalus =

Answer 29

subtalar dislocation + talar neck #

Question 30

mechanism of tarso-metatarsal dislocation

Answer 30

rotation of hyperplantarflexed foot

Question 31

Diagnose lisfranc # dislocation

Answer 31

CT +/- stress xray

Question 32

Rx of lisfranc # dislocation =

Answer 32

internally fix immediately