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Spinous Process Apophyseal Avulsion
Joseph Junewick, MD FACR
over 8 years ago
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Knee Dislocation

Case Detail

Anatomy: Musculoskeletal
Joseph Junewick, MD FACR
Diagnostic Category: Trauma
Created: over 10 years ago
Updated: over 10 years ago
Tags: PEDS
Modality/Study Types: CR
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18 year old injured playing basketball.

Case Images


Knee Dislocation

Clinical Notes

CT angiogram demonstrated intact popliteal artery with no dissection or occlusion.

MR demonstrated disrupted anterior and posterior cruciate and medial collateral ligaments.


CR – Anterior dislocation of tibia and fibula with foreshortening.


Dislocations of the knee are rare. Most dislocations reduce prior to initial orthopedic evaluation. Dislocations may be anterior, posterior, rotary, medial or lateral. Anterior dislocation often is caused by severe knee hyperextension. Cadaver research has shown that approximately 30 degrees of hyperextension is required before dislocation will occur. Popliteal artery and peroneal nerve injuries are common.

The knee is a very stable joint generally requiring high-energy trauma to produce dislocation. At least 3 major ligaments typically rupture for dislocation to occur. Nearly all dislocations will result in disruption of the cruciate ligments and, often, injury of the collateral ligaments. An injury to the popliteal tendon denotes a more severe injury. Common mechanisms of injury include the following: motor vehicle accidents, motor vehicle versus pedestrian, industrial accidents, falls and athletic injuries.


Yu JS, Goodwin D, Salonen D, Pathria MN, Resnick D, Dardani M, Schweitzer M.
Complete dislocation of the knee: spectrum of associated soft-tissue injuries depicted by MR imaging. AJR (1995); 164, 135-139.

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