Commonest dangerous complication of posterior dislocation of knee is-

Dislocation of the knee- *This rare injury results from severe violence to the knee so that all of its suppoing ligaments are torn. *It is a major damage to the joint, and is often associated with injury to the popliteal aery. *Treatment is by reduction followed by immobilization in a cylinder cast. Clinical evaluation : (vascular exam) -Measure Ankle-Brachial Index (ABI) if ABI >0.9 >>>> then monitor with serial examination if ABI <0.9 >>>> -If pulses are absent or diminished confirm that the knee joint is reduced or perform immediate reduction and reassessment - Immediate surgical exploration if pulses are still absent following reduction &;schema time >8 hours has amputation rates - If pulses present after reduction then measure ABI then consider observation vs. angiography Clinical evaluation : (vascular exam) -Priority is to rule out vascular injury on exam both before and after reduction serial examinations are mandatory. - Palpate the dorsalis pedis and posterior tibial pulses if pulses are present and normal , >> it does not indicate absence of aerial injury. Ref: Maheshwari 9th ed p.142