Metacarpophalangeal joint of thumb

The metacarpophalangeal (MCP) joints are the knuckle joints where the metacarpal bones of the hand meet the proximal phalanges of the fingers. These synovial joints allow flexion, extension, abduction, adduction, and limited rotation, enabling fine motor movements. They are supported by collateral ligaments, the volar plate, and the extensor hood, contributing to joint stability and…