Annular Ligament

Description

The lateral collateral ligament complex. The lateral collateral ligament complex consists of the lateral ulnar collateral ligament (LUCL), radial collateral ligament (RCL), and annular ligament. The LUCL runs from the lateral epicondyle and inserts on the supinator crest of the ulna and is the most important stabilizer against varus instability.

Annular Ligament of the radius

A) the annular ligament, B) proximal displacement of the annular ligament

Other Names

• Orbicular ligament
• Annular Ligament of the Radius
• Radial Annular Ligament
• Annular Ligament
• Ligamentum Anulare Radii

Anatomy

• Attached by both its ends to the anterior and posterior margins of the radial notch of the ulna
• Supported by attachments to the radial collateral ligament, elbow joint capsule

Actions

• Forms the articular surface of the head and neck of the radius
• Flexibility allows the oval head of the radius to rotate freely during pronation and supination
• Prevents distal displacement of the radius
• Stabilizes the proximal radial head, radioulnar joint

Vascular Supply

• Needs to be updated

Innervation

• Needs to be updated

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Clinical Significance

• Nursemaids Elbow
• Lateral Collateral Ligament Injury (Elbow)
• Posterolateral Rotatory Instability

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See Also

• Elbow Pain Main
• Elbow Anatomy Main
• Physical Exam Elbow

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