Related Experiment Video
Updated: Sep 9, 2026

Ultrasound-Guided Needle Release Combined with Corticosteroid Injection for the Treatment of Supinator Syndrome
Published on: May 26, 2023
The effect of partial removal of proximal ulna on elbow constraint
Abstract:
Accepted clinical practice allows the resection of up to 80% of the olecranon in comminuted fractures. Although this procedure is well-established, its effect on the static stability of the ulnohumeral joint has not been studied. An experiment was designed to study the amount of the greater sigmoid fossa of the ulna that can be removed before significant static ulnohumeral instability may occur. In eight fresh specimens, tested both in extension and at 90 degrees of flexion, changes in constraint were studied in four displacement, two torsional, and two axial modes. The constraint of the ulnohumeral joint appeared linearly proportional to the area of remaining articulation and was not provided solely by the distal 25%. The proximal portion of the olecranon has a greater effect on joint constraint than is generally appreciated.
More Related Videos
Related Concept Videos
Bones of the Upper Limb: Ulna
Bones of the Upper Limb: Radius
The radius has a nail-shaped head, and a short...
Muscles that Move the Forearm
Forearm Flexors
The biceps brachii, brachialis, and brachioradialis are forearm flexors. The biceps brachii is made up of two heads. Its long head originates at the supraglenoid tubercle of the scapula, whereas that of the short head is...
Muscles of the Forearm that Move the Hand and Fingers
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi radialis,...
Arteries of the Upper Limbs
Temperature Dependent Deformation

