Peroneus brevis tendon dislocation

Case contributed by Dr Salem Bauones


Acute ankle injury (torsion).

Patient Data

Age: 25
Gender: Female

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.
Annotated image

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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Case information

rID: 26656
Published: 1st Jan 2014
Last edited: 16th Jul 2018
Inclusion in quiz mode: Included

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