Stability at the thumb CMC joint is maintained by a capsuloligamentous complex which allows greater joint mobility and consists of five main components: the anterior oblique, or “beak”, ligament (AOL), the dorsoradial ligament (DRL), the dorsal central ligament (DCL), the posterior oblique ligament (POL) and the intermetacarpal ligament ...

Dec 10, 2021 · The anterior oblique ligament of the thumb is located at the ulnar volar aspect of the first carpometacarpal joint and the main task of the ligament is to prevent dorsal translocation.

Aug 1, 2024 · The anterior oblique ligament (AOL), dorsoradial ligament, and intermetacarpal ligament (IML) have been extensively studied in terms of their anatomy and relative contribution to thumb CMC joint stability.

Mar 18, 2025 · Thumb CMC Dislocations are rare injuries that occur due to axial force on a flexed thumb. Diagnosis is clinical and can be confirmed by orthogonal radiographs. Treatment is …

In this study we used cadaveric limbs and custom made biomechanical testing to measure the influence AOL has in stabilising the thumb against subluxation in three planes: radial, dorsal and dorsoradial.

This acts to reconstruct the stability of the AOL, DRL, and radial collateral ligaments and to correct the injury hypermobility. 17 These ligaments were chosen because the initial thought was that the AOL acted as the primary stabilizer of the thumb CMC joint.

The thumb carpometacarpal (CMC) joint or the trapeziometacarpal joint is a complex joint resembling two reciprocally opposed saddles whose transverse axes are perpendicular. 1 This morphology offers the CMC joint three planar motions; flexion–extension, abduction–adduction, and pronation–supination or opposition–retropulsion. 1 The ...

Mar 1, 2018 · The AOL; often called the beak ligament extends from the ulnar volar base of the first metacarpal to the trapezium. The AOL is described as an intra-articular ligament. As the closest ligament to the center of the joint, the AOL is a pivot point for pronation as it relates to thumb opposition.11, 12 The intra-articular

The exact ligaments that stabilise and prevent the thumb from the pull of APL causing dorsoradial subluxation remain unknown, although the anterior oblique ligament (AOL) has been implicated. The aim of this study was to measure the direction of subluxation resisted by the AOL.

During extension, flexion, abduction and adduction of the thumb, the anterior oblique (AOL), intermetacarpal (IML), posterior oblique (POL) and dorsal radial (DRL) ligaments were evaluated...