Elbow joint anatomy

The elbow joint is a joint between the lower end of the humerus and upper ends of the radius and ulna. It actually includes two articulations: (a) humero-ulnar articulation, between the trochlea of the humerus and trochlear notch of the ulna, and (b) humero-radial articulation, between the capitulum of the humerus and the head of radius. On the surface, the joint line of elbow is situated 2 cm below the line joining the two epicondyles of humerus. The complexity of elbow joint is further increased by its continuity with superior radio-ulnar joint. Thus there are three articulations in the elbow region, viz. (a) humero-ulnar, (b) humero-radial, and (c) superior (proximal) radio-ulnar. These are called cubital articulations