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Articular Capsule of Carpometacarpal Joint of Thumb
Connective Tissue

Articular Capsule of Carpometacarpal Joint of Thumb

Capsula articulationis articulationis carpometacarpalis pollicis

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Anatomical Relations

The articular capsule of the carpometacarpal joint of thumb is the membranous sac enclosing the articular surfaces of the base of the first metacarpal and trapezium. It is composed of an outer fibrous membrane and an inner synovial membrane. The ligaments of the carpometacarpal joint of the thumb, i.e., the palmar, lateral, and dorsal carpometacarpal ligaments reinforce the articular capsule.

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Function

The articular capsule of the carpometacarpal joint of the thumb ensures that the joint is sealed, thus, keeping the lubricating synovial fluid within the joint. It provides passive stability to the joint by limiting the joint movement. Additionally, it provides active stability but containing numerous proprioceptive nerve endings which relay mechanical information back to the central nervous system (Ralphs and Benjamin, 1994).

References

Ralphs, J. R. and Benjamin, M. (1994) 'The joint capsule: structure, composition, ageing and disease', Journal of Anatomy, 184(Pt 3), pp. 503-509.

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Carpometacarpal Joint

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The carpometacarpal joints of the fingers are synovial plane joints that serve as the articulation between the carpals and the metacarpals and allow articulation of the bases of the metacarpal bones with one another.

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