Presentation
Acute ankle injury (torsion).
Patient Data
Age: 25
Gender: Female
From the case:
Peroneus brevis tendon dislocation
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US images of peroneal tendons show:
- heterogeneous, thickened hypoechoic appearance of the fibular insertion of the superior peroneal retinaculum.
- dislocation (luxation) of the peroneus brevis tendon occured with resisted eversion of the hind foot as it moves anteriorly over the lateral malleolus.
- ultrasonographic snapping of the peroneal tendons. (real time US sign)
- fluid accumulation (effusion) in the peroneal synovial sheath.
From the case:
Peroneus brevis tendon dislocation
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The peroneus brevis (PB) tendon is moving anteriorly over the lateral malleolus.
The peroneus loongus (PL) tendon is in its retromalleolar place.
Note the thickened disinserted superior peroneal retinaculum is indicated by the blue arrow.
Case Discussion
The findings are consistent with superior peroneal retinaculum disinsertion and premalleolar dislocation of peroneus brevis tendon.
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