Radial collateral ligament of elbow joint

Radial collateral ligament of elbow joint

Ligaments of the elbow joint. Anterior view.
Latin	ligamentum collaterale radiale articulationis cubiti

The radial collateral ligament of the elbow joint is a key ligament that provides lateral stability to the elbow. It is one of the major ligaments that support the elbow joint, along with the ulnar collateral ligament of elbow joint and the annular ligament of radius.

Anatomy

The radial collateral ligament originates from the lateral epicondyle of the humerus, a bony prominence on the outer side of the elbow. It extends distally to blend with the annular ligament of the radius, which encircles the head of the radius. This anatomical arrangement allows the radial collateral ligament to stabilize the elbow joint during various movements, particularly those involving supination and pronation of the forearm.

Function

The primary function of the radial collateral ligament is to resist varus stress, which is the inward angulation of the distal segment of the limb. It helps maintain the alignment of the elbow joint and prevents excessive lateral movement that could lead to dislocation or injury.

Clinical Significance

Injuries to the radial collateral ligament are less common than injuries to the ulnar collateral ligament but can occur due to trauma or repetitive stress. Such injuries may result in pain, swelling, and instability of the elbow joint. Diagnosis is typically confirmed through physical examination and imaging studies such as MRI, which can reveal tears or other abnormalities in the ligament.

MRI showing an unimpaired radial collateral ligament and extensor tendon.

Surgical Considerations

In cases where the radial collateral ligament is severely damaged, surgical intervention may be necessary. This can involve ligament repair or reconstruction using grafts. Post-surgical rehabilitation is crucial to restore full function and strength to the elbow joint.

Also see

• Ulnar collateral ligament of elbow joint
• Annular ligament of radius
• Elbow joint
• Lateral epicondylitis

References

• Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2013). Clinically Oriented Anatomy. Lippincott Williams & Wilkins.
• Netter, F. H. (2014). Atlas of Human Anatomy. Elsevier.