Figure 17.

Painful os peroneum syndrome with traumatic diastasis of bi- partite os peroneum in a 56-year-old woman after a fall. Sagittal short TI inversion recovery magnetic resonance (MR) image demonstrates distrac- tion and edema of the proximal and distal ossicles of bipartite os perone- um (arrowheads), equivalent to a complete peroneus longus tendon tear. The ossicles may be difficult to identify on fluid sensitive sequences due to bone contusions and surrounding soft tissue swelling. Correlation with T1-weighted MR images and radiographs is essential. The proximal stump of the torn PL tendon is retracted into the inframalleolar region