At the exit of the tunnel, it trifurcates into a deep peroneal nerve, a superficial peroneal nerve, and an articular branch, which extends to the proximal tibiofibular joint
Involvement of the lower extremities is much less common,1 and the compression of the peroneal nerve at the level of the knee and proximal tibiofibular joint has been described scarcely.
The cyst was seen to arise from the anterior aspect of the proximal tibiofibular joint with a distinct pedicle.
The pathogenesis of these cysts has been the subject of controversy, but the hypothesis of articular (synovial) origin from the proximal tibiofibular joint seems to be most likely.
Ganglion cysts occur along a tendon sheath, such as the semimembranosus tendon, or near the proximal tibiofibular joint
Synovial chondromatosis of four compartments of the knee: medial and lateral tibiofemoral spaces, patellofemoral joint and proximal tibiofibular joint
RADIOLOGIC DIAGNOSIS: This is a case of osteochondromiatosis of the proximal tibiofibular joint
with associated bone bruise and degenerative osteophytosis.