The metacarpophalangeal joint (MCPJ) of the long fingers exhibits complex joint kinematics, including flexion-extension, lateral movements, and axial rotation. It functions through a balance between mobility on one hand and stability and joint congruence on the other. The anatomical structures that ensure this balance through adaptive biomechanical mechanisms are the articular surfaces, the capsuloligamentous system, and the musculotendinous system [1].