What type of joint is the proximal radio-ulnar joint?

It is a pivot-type synovial joint. This structure allows the radial head to rotate within a fibro-osseous ring, enabling forearm movements like supination and pronation.

What are the articular surfaces of the proximal radio-ulnar joint?

The joint involves two main components: the radial component is the circumference of the radial head, and the ulnar component is a fibro-osseous ring formed by the radial notch of the ulna and the annular ligament.

What ligaments support the proximal radio-ulnar joint?

Key ligaments include the annular ligament that encircles the radial head, the quadrate ligament for support and prevention of synovial herniation, and the capsular ligament that encloses the joint and connects to the elbow capsule.

What movements does the proximal radio-ulnar joint allow?

It enables supination and pronation of the forearm. This occurs as the radial head rotates within the annular ligament.

What is the blood and nerve supply to the proximal radio-ulnar joint?

Blood supply comes from articular branches of the lateral arterial anastomosis around the elbow. Nerve supply includes articular branches from the musculocutaneous, median, radial, and ulnar nerves.

How is the proximal radio-ulnar joint related to nearby muscles?

It is closely associated with the supinator muscle anteriorly and laterally, and the anconeus muscle posteriorly.

What is the role of the synovial membrane in this joint?

The synovial membrane lines the inner capsule and annular ligament, providing lubrication. It is continuous with the synovial membrane of the elbow joint.

Proximal Radioulnar Joint – Anatomy & Movement

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