Ulnar collateral ligament of thumb

Ulnar Collateral Ligament of Thumb

The Ulnar Collateral Ligament of Thumb (UCL) is a key anatomical structure in the human hand, specifically located in the metacarpophalangeal (MCP) joint of the thumb. It plays a crucial role in the stability and functionality of the thumb, particularly in pinching and gripping actions.

File:Ulnar Collateral Ligament of Thumb.jpg

Ulnar Collateral Ligament of Thumb

Anatomy

The UCL is a small band of fibrous tissue that connects the metacarpal bone of the thumb to the proximal phalanx. It is located on the ulnar side of the MCP joint, hence its name. The ligament is divided into two parts: the proper collateral ligament and the accessory collateral ligament.

Function

The primary function of the UCL is to provide stability to the thumb, preventing excessive abduction and extension. It also aids in the thumb's ability to pinch and grip objects.

Injuries

Injuries to the UCL, commonly known as Gamekeeper's thumb or Skier's thumb, are often caused by a sudden force that pulls the thumb away from the palm of the hand. This can result in a sprain or a complete tear of the ligament.

Diagnosis and Treatment

Diagnosis of a UCL injury typically involves a physical examination and imaging tests such as X-rays or an MRI. Treatment options can range from non-surgical methods like splinting and physical therapy, to surgical repair in more severe cases.

See Also

• Hand anatomy
• Ligament
• Gamekeeper's thumb
• Skier's thumb