1. Subluxed dislocated peroneal tendons.
2. Peroneus brevis tear
3. Peroneus quartus muscle
Surgical repair with the following findings:
1. No intraoperative evidence of peroneus brevis tendon tear.
2. Dislocated peroneal tendons.
3. Likely symptomatic peroneus quartus.
Successful surgical repair.
While relatively uncommon, the peroneus quartus can occur in up to 10% of the population and can be an uncommon cause of lateral ankle instability.
Common findings along with peroneus quartus include a longitudinal tear in the tendon of the peroneus brevis, possible peroneal tendon subluxation or dislocation or a prominent retrotrochlear eminence.
A peroneus quartus may also be used for surgical reconstruction as needed.
Athavale, S. Anatomy of the Superior Peroneal Tunnel. J Bone Joint Surg Am, 2011 Mar 16;93(6):564-571.
Zammit J. The peroneus quartus muscle. Anatomy and clinical relevance. J Bone joint Surg Br. 2003 Nov; 85 (8): 1134-7.
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