Chapter 101 - Knee Dislocations and Patella Fractures

Question 1

how to monitor common peroneal nerve palsy after knee dislocation

Answer 1

emg at 4-6 weeks for baseline, then again at 3 months

Question 2

salvage procedure for common peroneal nerve injury

Answer 2

tibialis posterior transfer to restore ankle dorsiflexion

Question 3

treatment for irreducible posterolateral knee dislocations with medial femoral condyle buttonholed thru what?

Answer 3

treatment is emergent OR reduction
medial femoral condyle is buttonholed thru the medial capsule

Question 4

what complication about the femur is unique to knee dislocations

Answer 4

osteonecrosis of the medial femoral condyle

Question 5

bipartate patella most commonly involves what portion?

Answer 5

superolateral

Question 6

how does the patella inccrease the power of the extensor mechanism?

Answer 6

increases by 30% by anteriorly displacing the extensor mechnism away from the knee center of rotation -> increased moment arm

Question 7

principle arterial supply to the patella enters where?

Answer 7

inferomedially
geniculate a forming a vascular ring