metacarpophalangea

The metacarpophalangeal joints, often abbreviated as MCP joints, are the joints located in the hand between the metacarpal bones and the proximal phalanges. These are the knuckles of the hand, connecting the palm to the fingers. There are five MCP joints in each hand, corresponding to each of the five digits. Each MCP joint is a synovial joint, specifically a condyloid or ellipsoid type, allowing for a variety of movements.

These movements include flexion, extension, abduction (spreading of the fingers), adduction (bringing the fingers together), and circumduction. The primary movements of the MCP joints are flexion and extension, which are crucial for grasping and releasing objects. The collateral ligaments of the MCP joints provide stability, preventing excessive side-to-side movement. The joint capsule encloses the articulation, and it is lined with synovial membrane which produces lubricating fluid. Injuries to the MCP joints, such as dislocations or fractures, can significantly impair hand function. Conditions like rheumatoid arthritis commonly affect these joints, leading to inflammation and stiffness.