Humeroradial articulation

Humeroradial articulation consists of the concave head of the radius articulating with the convexshaped capitellum of the humerus. Motion of this articulation must accompany humeroulnar flexion-extension. This angular motion is accompanied by ventral and dorsal translatory slide of the radius on the humerus dorsal radial slide with extension and ventral radial slide with flexion (Fig. 81-2). Extension stress is the major cause of posterior radial head somatic dysfunction. 

The distal end of the humerus articulates with the ulna and radius, forming two articulations the humeroulnar, between the trochlea of the humerus and the trochlear notch of the ulna, and the humeroradial, between the capitellum of the humerus and the head of the radius (Fig. 81-1). 

---