Traumatic Rupture of the Coracobrachialis Muscle

R upture of the coracobrachialis muscle is extremely rare; to the best of our knowledge, rupture of this muscle from indirect, nonpenetrating trauma has yet to be reported. This case report describes a distal coracobrachialis rupture that was caused by indirect trauma. Because of the progression of the injury and its clinical presentation, along with the rarity of a coracobrachialis rupture, the patient was initially diagnosed with a distal biceps tendon rupture at an outside institution, which delayed treatment. The coracobrachialis muscle functions as a flexor of the shoulder. Additionally, it serves as an adductor and internal rotator of the shoulder and stabilizes the shoulder joint when the arm is at the side. It inserts via a flat tendon in the middle third of the humerus, between the origins of the brachialis and triceps muscles. It is important to be aware of the rare rupture of the coracobrachialis muscle because it may be misdiagnosed as a distal biceps tendon rupture. We aim to emphasize the importance of recognizing this unusual injury and to present a surgical treatment option. The patient was informed that data concerning the case would be submitted for publication, and he provided consent.