The Calcaneal Groove For The Tendon Of The Flexor Hallucis Longus, Medial View

Description

Medial hindfoot anatomy comes into focus on the calcaneus, highlighting the calcaneal groove (sulcus tendinis musculi flexoris hallucis longi) coursing inferior to the sustentaculum tali. The sequence tracks the concavity as it runs obliquely on the medial surface of the calcaneal body, posterior to the subtalar articular surface and superior to the plantar tuber. As the camera settles, the relationship to adjacent bony landmarks becomes clear: the sustentaculum tali forms a superior buttress while the groove guides the flexor hallucis longus tendon toward the plantar midfoot. Clinically, this is the bony channel that redirects the flexor hallucis longus (FHL) tendon after it passes posterior to the talus and under the sustentaculum tali, a frequent site of stenosing tenosynovitis in dancers and running athletes. Seeing the groove in motion helps explain why tendon excursion during hallux flexion can provoke posteromedial ankle and heel pain when the tendon sheath thickens or when a prominent sustentaculum tali narrows the passage. It also frames the regional anatomy relevant to hindfoot endoscopy and posterior ankle arthroscopy, where working portals must respect the FHL as a medial landmark while addressing posterior impingement or os trigonum pathology. Use this animation in gross anatomy and musculoskeletal anatomy teaching to anchor the concept of osteofibrous pulleys in the tarsal region, and in orthopaedic or podiatric education when discussing posterior tibial tendon complex differentials versus FHL tendinopathy. It also suits surgical atlases and CME modules that cover posteromedial ankle pain, subtalar approaches, or tendon-sheath pathology with an emphasis on palpable and intraoperative bony landmarks. Anatomical accuracy verified by SciePro's Medical Advisory Board.