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Posterior ankle impingement

Case contributed by Mohammad A. ElBeialy
Diagnosis certain

Presentation

Posterior ankle pain.

Patient Data

Age: 17 years
Gender: Male
x-ray

Elongated posterolateral talar (stieda) process. No fracture, no other bony or articular abnormality. 

mri

Elongated lateral tubercle of the talus (Stieda process) as well as mild posterior lateral capsular thickening and synovitis with mild focal tenosynovitis involving the flexor hallucis longus. 

The posterior talofibular ligament also appears mildly thickened with intermediate T1 and T2 signal intensity.  

Focal marrow edema signal of the medial talar dome is seen with hypointense T1 and hyperintense T2 and STIR signal with likely small osteochondral lesion.

Intact collateral ligaments and tendo-achilles. No joint effusion. 

Case Discussion

Posterior ankle impingement with elongated posterolateral talar Stieda process.  

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