Functional Elbow Joint This functional elbow joint model provides a graphic demonstration of the anatomy and mechanics of the joint, allowing better doctor-patient or teacher-student understanding of the anatomy of the elbow joint. Use this life-size and fully flexible, bendable elbow joint to demonstrate abduction, anteversion, retroversion, internal/external rotation and much more. Elbow joint consists of portion of humerus, complete ulna and radius as well as joint ligaments. Functional elbow joint on removable stand.