Carpometacarpal and Intermetacarpal Joints Type of Joint Plane Type Synovial Joints- EXCEPT the Carpometacarpal Joint of the Thumb, Which Is a Saddle Type Joint

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Carpometacarpal and Intermetacarpal Joints Type of Joint Plane Type Synovial Joints- EXCEPT the Carpometacarpal Joint of the Thumb, Which Is a Saddle Type Joint

This document was created by Alex Yartsev ([email protected]); if I have used your data or images and forgot to reference you, please email me. Carpometacarpal and Intermetacarpal joints Type of joint Plane type synovial joints- EXCEPT the carpometacarpal joint of the thumb, which is a saddle type joint Articulating surfaces Distal surfaces of the carpal bones articulate with the bases of the metacarpals The important thumb joint is the articulation between the trapezium and the bease of the first metacarpal The INTERMETACARPAL joints ar adjacent metacarpals articulating with each other’s bases Articular capsule The medial four carpometacarpal joints, and the three intermetacarpal joints, are all enclosed by the same articular capsule. The thumb CMC joint has its own capsule Ligaments All thse bones are united by the palmar and dorsal carpometacarpal ligaments, and by the intermetacarpal ligaments. The DEEP TRANSVERSE METACARPAL LIGAMENT and the SUPERFICIAL TRANSVERSE METACARPAL LIGAMENT (which is part of the palmar aponeurosis) both work to prevent separation of the metacarpal bases Stability factors The above ligaments are he major stability factors Movements Almost no movement at the CMCs of the 2nd and 3rd fingers, Slight movement at the 4th CMC Moderate movement of the 5th CMC (flexion, extension and rotation) Blood supply Periarticular arterial anasomoses of the wrist and hand (basically, the arterial arches) Nerve supply Anterior interosseous branch of the median nerve, posterior interossous branch of the radial nerve, and dorsal and deep branches of the ulnar nerve The carpometacarpal joint of the thumb is independent – it has its own synovial capsule .

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