Hosting 718 files, 2916 images, and 4 contributors.

 
Random Case

Choroid Plexus Carcinoma
Joseph Junewick, MD FACR
over 7 years ago
Enter A Workflow
Standard2   Academic2

Please choose a workflow. A standard workflow allows you to browse the repository with full case detail; the academic workflow allows you to browse the repository with limited case detail revealed. Double click on the images to launch image viewer.

ARSt Case Repository

Knee Dislocation

Case Detail

Anatomy: Musculoskeletal
Junewick
Joseph Junewick, MD FACR
Diagnostic Category: Trauma
Created: over 7 years ago
Updated: over 7 years ago
Tags: PEDS
Modality/Study Types: CR
Activities:
Adobe32 PDF Imagej32 ImageJA

History

18 year old injured playing basketball.


Case Images


Diagnosis

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.

Findings

CR – Anterior dislocation of tibia and fibula with foreshortening.

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.

Reference

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.



Corporate Office: 616.363.7272, 3264 North Evergreen Drive, Grand Rapids, MI 49525

Spectrum Health Helen Devos Childrens Hospital GE HealthCare