Collateral ligament of interphalangeal joints of hand

Gray's anatomy image 338

The collateral ligaments of the interphalangeal joints of the hand are crucial structures that provide stability to the joints between the phalanges. These ligaments are found on both the radial and ulnar sides of each interphalangeal joint, which includes both the proximal and distal interphalangeal joints.

Anatomy

The collateral ligaments are composed of strong, fibrous connective tissue. Each interphalangeal joint has two collateral ligaments:

• The radial collateral ligament is located on the side of the joint closest to the thumb.
• The ulnar collateral ligament is located on the side of the joint closest to the little finger.

These ligaments attach from the head of one phalanx to the base of the adjacent phalanx, crossing the joint obliquely. They are taut when the joint is in extension and become even more taut during flexion, providing lateral stability and preventing excessive side-to-side movement.

Function

The primary function of the collateral ligaments is to stabilize the interphalangeal joints during movement. They prevent lateral dislocation and ensure that the joints move in a controlled manner. This stability is essential for the fine motor functions of the hand, such as gripping and manipulating objects.

Clinical Significance

Injuries to the collateral ligaments of the interphalangeal joints can occur due to trauma, such as a fall or direct blow to the finger. Common injuries include sprains, tears, and avulsions. Symptoms of collateral ligament injuries include pain, swelling, and instability of the affected joint. Treatment may involve rest, splinting, physical therapy, or, in severe cases, surgical repair.

Related Structures

• Flexor digitorum superficialis
• Flexor digitorum profundus
• Extensor digitorum
• Volar plate
• Metacarpophalangeal joint

See Also

• Hand anatomy
• Ligament
• Joint stability
• Finger injuries

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