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Medullary Nephrocalcinosis
Joseph Junewick, MD FACR
over 9 years ago
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Case History

18 year old injured playing basketball.

Case Detail

Anatomy: Musculoskeletal
Joseph Junewick, MD FACR
Diagnostic Category: Trauma
Created: over 8 years ago
Updated: over 8 years ago
Tags: PEDS
Modality/Study Types: CR
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Reveal Clinical Notes

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

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

Reveal Findings

CR – Anterior dislocation of tibia and fibula with foreshortening.

Reveal Discussion

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.

Reveal Diagnosis

Knee Dislocation

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