Abstract:

Objective　To explore anatomic features of the brachialis insertion and provide basis for the placement of the coronoid plate.　Methods　8 normal adult fresh elbow specimens were dissected. The insertion site of brachialis, the length and width of the insertion, the distance from the insertion to the attachment of anterior bundle of medial collateral ligament, and the distance from the proximal edge of brachialis insertion to coronoid tip, were measured and analyzed respectively.　Results　For all cases, two brachialis insertions could be detected, which was in the medial side of the line of olecranon-coronoid tip, with the insertion length of (21.79±2.70)mm. The width of the superficial head insertion was about (4.11±1.12)mm, constituted with aponeurosis。The width of the deep head insertion was about (11.25±3.07)mm, constituted with aponeurosis and muscle. The widths of the radial and ulnar aponeurosis were (1.77±0.46)mm and (2.75±0.57)mm respectively. The width of the muscle between two insertions was (6.82±2.08)mm. The distance from brachialis insertion to the attachment of anterior bundle of medial collateral ligament was about (4.14±0.49)mm, and the length from the proximal edge of brachialis insertion to coronoid tip was about (9.30±1.51)mm. Conclusions　(1) The interval between the brachialis insertion and the attachment of the anterior bundle of medial collateral ligament is adaptive for coronoid plate placement. (2) The interval will be extended to 6.89mm once the the ulnar aponeurosis is released, and even reach about 13.71mm after releasing muscle between two insertions, which is enough for placing coronoid plate.

Key words: Brachialis insertion, Coronoid process fracture, Plate, Applied anatomy