traumatism are rare. This joint has wide articular surfaces, and
securely joined as they are by the heavy medial and lateral ligaments
(internal and external lateral ligaments), luxation is practically
impossible. When luxation does occur, irreparable injury is usually
done. Castagné as quoted by Liautard[15], reports a case of true
luxation of the elbow joint in a horse where reduction was effected and
complete recovery took place at the end of twenty-five days. This is an
unusual case. The average practitioner does not meet with such
instances.

Anatomy.--The condyles of the humerus articulate with the glenoid
cavities of the radius and a portion of the ulna. Two strong collateral
ligaments pass from the distal end of the humerus to the head of the
radius. The capsular ligament is a large, loose membrane which encloses
the articular portion of the humerus with the radius and ulna and also
the radioulnar articulation. It is attached anteriorly to the tendon of
the biceps brachii (flexor brachii). The capsule extends downward
beneath the origin of these digital flexors. This fact should be
remembered in dealing with puncture wounds in the region, lest an error
be made in estimating their extent and an open joint be overlooked at
the initial examination.

Etiology and Occurrence.--Exclusive of specific or metastatic
arthritis, which is seldom observed except in young animals,
inflammation of the elbow joint is usually caused by injury. This
articulation is not subject to pathologic changes due to concussion or
sprains as occasioned by ordinary service, but is frequently injured by
contusion from falls, blows from the wagon-pole and kicks. Wounds which
affect the elbow joint, then, may be thought of in most cases, as
resultant from external violence. They may be contused wounds or