The elbow
Anatomy
The elbow joint is comprised of three joints, connecting the humerus, radius, and ulna. These three bones form the humero-ulnar joint, the proximal radio-ulnar joint, and the humero-radial joint. The primary point of articulation at the elbow is the trochlea of the humerus with the trochlear notch of the ulna. However, the head of the radius also articulates with the humerus, as well as with the ulna. This elbow is classified as a hinge joint due to its primary action of extension and flexion, although the proximal radio-ulnar joint also allows for rotation (forearm supination and pronation). However, the elbow can also slightly flex laterally (abduction and adduction) through the application of valgus or varus forces. Excessive and/or chronic valgus or varus force on the elbow joint can result in common conditions of the elbow, including "Tennis Elbow".
Bones of the elbow
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Ligaments of the Elbow
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The joint capsule
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