Elbow

The elbow joint is a hinge or hinge joint. It has three joints: humerus-ulnar, between the trochlea of the humerus and the trochlear notch of the ulna, humerus-radial, between the humeral capitulum and the head of the radius, and proximal radio-ulnar, between the head of the radius and the radial notch ulna.

The articular surfaces are joined by a capsule that is thickened medially and laterally by the ulnar and radial collateral ligaments.

Articular Capsule – It surrounds the entire joint and is formed by two parts: anterior and posterior. The anterior part is a thin fibrous layer that covers the anterior surface of the joint. The posterior part is thin and membranous and consists of oblique and transverse fibers.

Ulnar Collateral Ligament – It is a thick triangular bundle consisting of two portions: anterior and posterior, joined by a thinner intermediate portion.

Radial Collateral Ligament – It is a triangular fibrous bundle, less evident than the ulnar collateral ligament.

The proximal radioulnar joint is a trochoid or pivot joint between the circumference of the head of the radius and the ring formed by the radial notch of the ulna and the annular ligament.

Annular Ligament – It is a strong bundle of fibers that surrounds the head of the radius, keeping it in contact with the radial notch of the ulna.

From the inferior border of the annular ligament, a thick bundle of fibers extends to the neck of the radius, called the quadratus ligament.

ANTERIOR VIEW OF JOINT STRUCTURES OF THE ELBOW
 Vista Anterior das Estruturas Articulares do Cotovelo
Source: NETTER, Frank H.. Atlas of Human Anatomy. 2nd edition Porto Alegre: Artmed, 2000.
SIDE AND MEDIAL VIEW OF THE JOINT STRUCTURES OF THE ELBOW
Vista Lateral e Medial das Estruturas Articulares do Cotovelo
Source: NETTER, Frank H.. Atlas of Human Anatomy. 2nd edition Porto Alegre: Artmed, 2000.
ANTERIOR AND POSTER VIEW OF JOINT STRUCTURES OF THE ELBOW
Vista Anterior e Posterior das Estruturas Articulares do Cotovelo
Source: NETTER, Frank H.. Atlas of Human Anatomy. 2nd edition Porto Alegre: Artmed, 2000.



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