This cadaveric and histologic study maps the anatomy that stabilizes the long head of biceps at the rotator interval. It examines how the SGHL, CHL, and superiormost subscapularis tendon interact to keep the LHB in its groove. The goal was a unified explanation for how these structures resist anteromedial biceps dislocation.
When you see an unstable or medially subluxed long head of biceps, look hard at the subscapularis. This study reframes biceps pulley stability as a team effort rather than a single ligament. The SGHL spirals around the LHB, but it depends on the superiormost subscapularis insertion buttressing it from behind, plus tension conveyed from the CHL.
The practical consequence: an articular-sided or full-thickness subscapularis tear destroys the tendinous slip that anchors the SGHL, so the biceps loses its support and dislocates anteromedially. That mental model, medial biceps subluxation should trigger a search for a hidden subscapularis lesion, is directly testable and clinically useful.
For repair, the authors emphasize fixing subscapularis tissue widely onto the uppermost margin of the lesser tuberosity to restore the buttress.
This cadaveric and histologic study maps the anatomy that stabilizes the long head of biceps at the rotator interval. It examines how the SGHL, CHL, and superiormost subscapularis tendon interact to keep the LHB in its groove. The goal was a unified explanation for how these structures resist anteromedial biceps dislocation.
When you see an unstable or medially subluxed long head of biceps, look hard at the subscapularis. This study reframes biceps pulley stability as a team effort rather than a single ligament. The SGHL spirals around the LHB, but it depends on the superiormost subscapularis insertion buttressing it from behind, plus tension conveyed from the CHL.
The practical consequence: an articular-sided or full-thickness subscapularis tear destroys the tendinous slip that anchors the SGHL, so the biceps loses its support and dislocates anteromedially. That mental model, medial biceps subluxation should trigger a search for a hidden subscapularis lesion, is directly testable and clinically useful.
For repair, the authors emphasize fixing subscapularis tissue widely onto the uppermost margin of the lesser tuberosity to restore the buttress.