Bilateral, Atraumatic Proximal Tibiofibular Joint Instability Treated With Suspensory Button Fixation.

Proximal tibiofibular joint (PTFJ) instability is a rare cause of lateral-sided knee pain. The authors present a case of bilateral, symptomatic PTFJ instability with peroneal nerve dysfunction in an active 16-year-old female athlete. This was addressed with peroneal nerve decompression and PTFJ stabilization using a suspensory button fixation system. This provides an alternative treatment from historical methods such as PTFJ fusion or re-approximation of the joint with tendon through bone tunnels. The surgical technique, as well as potential treatment challenges, is described in detail. The purpose of this report is to highlight PTFJ instability as a cause of lateral-sided knee pain to avoid misdiagnosis and delay in appropriate treatment. This patient had significant improvement in pain and decreased neurologic symptoms after the stabilization and nerve decompression. She was able to return to high-level activity. [Orthopedics. 2017; 40(6):e1107-e1111.].