Collateral ligament of interphalangeal articulations of hand

The collateral ligament of interphalangeal articulations of hand are fibrous bands located on each side of the fingers' interphalangeal joints. These are diagonally placed and act as hinge joints, specifically for flexion and extension movements. There are two sets of collateral ligament of interphalangeal articulations of hand: proximal interphalangeal joints and distal interphalangeal joints. The proximal interphalangeal joints are located between the hand's proximal (first) and intermediate (second) dorsal phalanges. The distal interphalangeal joints are located near the fingers' palmar margins, or between the hand's distal second and third phalanges. The proximal and distal interphalangeal joint articulations are anatomically similar. Their minor differences are in the segmentation of their flexor tendon sheaths and in the proximal attachment of their volar plates. Their major difference is that the distal joint has reduced mobility and is smaller. Flexion is restricted by 20 degrees in the distal interphalangeal joint. The collateral and volar ligaments limit extension. The collateral ligament of interphalangeal articulations of hand is the joint that breaks most easily out of all of the body's joints.
Written and medically reviewed by the Healthline Editorial Team
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In Depth: Collateral ligament of interphalangeal articulations of hand

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