Anterior annular ligament

Anterior Annular Ligament

The Anterior annular ligament is a fibrous band of tissue that encircles the radius, one of the two bones of the forearm. It is part of the elbow joint and plays a crucial role in the stability and flexibility of the joint.

Anatomy

The anterior annular ligament is a strong band of fibers that encircles the head of the radius. It is attached anteriorly to the anterior margin of the radial notch of the ulna, and posteriorly to the base of the coronoid process and the olecranon. The ligament is lined by a thin layer of synovial membrane, which lubricates the joint to reduce friction and wear.

Function

The primary function of the anterior annular ligament is to hold the radius in place within the elbow joint, allowing it to rotate during pronation and supination of the forearm. This rotation is essential for many daily activities, such as turning a doorknob or using a screwdriver.

Clinical Significance

Injury to the anterior annular ligament can result in a condition known as radial head subluxation, also known as "nursemaid's elbow". This is a common injury in young children and occurs when the radius slips out of the ligament. Symptoms include pain, inability to move the elbow, and holding the arm in a bent position. Treatment typically involves a procedure known as a reduction, in which a healthcare provider manually manipulates the radius back into place.

See Also

• Elbow
• Radius (bone)
• Ulna
• Radial head subluxation