Knee dislocation

Question 1

Why emergency?

Answer 1

Complex surrounding blood supply

Common peroneal nerve, tibial nerve

Question 2

Mechanism of injury

Answer 2

Anterior: Hyperextension (Usually limited by extensor mechanism, vascular less likely to be injured)
Posterior: Axial load to flexed knee (popliteal commonly injured)
Lateral: Valgus or varus force
Rotary: Rarest

Question 3

CF

Answer 3

1. Vascular: PTA, DP

2.

Question 4

Management

Answer 4

1. On site: splint knee extension, avoid analgesia
2. ED: Closed reduction
   3 OT: Closed or open?
   delay why? arthrofibrosis if repair early???