Abstract
The flexor hallucis longus tendon is susceptible to impingement, longitudinal tears, or ruptures throughout the whole course of the tendon. The most frequently affected site is the fibro-osseous tunnel from posterior talus to under the sustentculum tali, followed by the master knot of Henry and intersesamoid ligament. The purpose of this Technical Note is to describe the details of endoscopic resection of a sustentaculum tali bone spur that entraps the flexor hallucis longus tendon. This minimally invasive approach can avoid the extensive soft-tissue dissection of open resection.