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The annular ligament (orbicular ligament) is a strong band of fibers that encircles the head of the radius, and retains it in contact with the radial notch of the ulna. [1] Per Terminologia Anatomica 1998, the spelling is "anular", [2] but the spelling "annular" is frequently encountered.
In this movement the ulna, which is connected to the humerus by a simple hinge-joint, remains stationary, while the radius rotates, carrying the wrist and hand with it. To allow this rotation, the proximal (elbow) end of the radius is held in proximity to the ulna by a ligament known as the annular ligament.
the annular ligament (AL), from the posterior to the anterior margins of radial notch on the ulna, encircles the head of radius and holds it against the radial notch of ulna. [5] the accessory lateral collateral ligament (ALCL), from the inferior margin of the annular ligament to the supinator crest.
It occurs between the circumference of the head of the radius and the ring formed by the radial notch of the ulna and the annular ligament. [2] The interosseous membrane of the forearm and the annular ligament stabilise the joint. [2] A number of nerves run close to the proximal radioulnar joint, including: median nerve; musculocutaneous nerve ...
The annular ligament binds the head of the radius to the radial notch of the ulna, preventing any separation of the two bones laterally.Therefore, the humeroradial joint is not functionally a ball and socket joint, although the joint surface in itself allows movement in all directions.
During activities such as overhand baseball pitching, this ligament is subjected to extreme tension, which places the overhand-throwing athlete at risk for injury. [4] Acute or chronic disruption and/or attenuation of the ulnar collateral ligament often result in medial elbow pain, valgus instability, and impaired throwing performance. There ...
Ulnar collateral ligament injuries can occur during certain activities such as overhead baseball pitching. Acute or chronic disruption of the ulnar collateral ligament result in medial elbow pain, valgus instability, and impaired throwing performance. There are both non-surgical and surgical treatment options.
The supinator consists of two planes of fibers, between which passes the deep branch of the radial nerve.The two planes arise in common—the superficial one originating as tendons and the deeper by muscular fibers [2] —from the supinator crest of the ulna, the lateral epicondyle of the humerus, the radial collateral ligament, and the annular radial ligament.
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