Radial Collateral Ligament of the Elbow

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Definition

By Gregory R. Waryasz, MD

The radial collateral ligament of the elbow of the musculoskeletal system is characterized by its location and function. It is also known as the lateral collateral ligament of the elbow.

It is part of the elbow joint. It consists of fibrous dense regular connective tissue of collagen fibers.

Its unique structural feature is that it is a lateral and fan-like ligament that extends from the lateral humeral epicondyle to then blend with the annular ligament of the radius.

The radial collateral ligament as well as all other bones, muscles, and ligaments of the body are derived of mesodermal origin in the embryo.

The function of the radial collateral ligament is to provide support to the lateral elbow.

Common diseases include ligament tears and posterolateral rotary instability.

Posterolateral rotary instability is a condition that occurs after elbow trauma or surgery on the radial collateral ligament of the elbow.  It is not linked to throwing activities, but to trauma.  The elbow is painful, can have clicks with range of motion activities, and there can be other mechanical symptoms.

Commonly used diagnostic procedures include clinical history, physical exam, x-ray, and MRI.

It is usually treated with physical therapy and NSAIDs. Surgery can be performed if there is significant laxity in the elbow.  Posterolateral rotary instability is treated with surgery to tighten up the radial collateral ligament designed to improve joint stability.

References

Elstrom J, Virkus W, Pankovich (eds), Handbook of Fractures (3rd edition), McGraw Hill, New York, NY, 2006.

Koval K, Zuckerman J (eds), Handbook of Fractures (3rd edition), Lippincott Williams & Wilkins, Philadelphia, PA, 2006.

Lieberman J (ed), AAOS Comprehensive Orthopaedic Review, American Academy of Orthopaedic Surgeons, 2008.

Moore K, Dalley A (eds), Clinically Oriented Anatomy (5th edition), Lippincott Williams & Wilkins, Philadelphia, PA, 2006.