A 40 year old male who slipped on a step and developed sudden pain on the lateral aspect of the ankle.
A normal X-Ray.
The ultrasound shows that all the ligaments surrounding the ankle joint are intact.
A complete tear is noted of the retinuculum over the peroneus tendons.
Note the dislocation of peroneus longus over the lateral malleolus on dynamic viewing with dorsi-flexion.
Fluid is seen surrounding both the tendons.