Anatomic study on anteromedial approach exposure of coronoid process fracture

Purpose: This study aimed to measure anteromedial-approach exposure of coronoid process fracture via anatomy in order to provide anatomic foundation of clinical operations. Methods: A total of 20 adult upper limb specimens (12 male side limbs and 8 female side limbs) were dissected. Each value was measured separately. Superficial layer: Humeral medial epicondyle is point A, the intersection between connecting line of medial & lateral epicondyle and medial edge of median nerve is point B, distance between A and B was measured. Middle layer: distance of point A is from bifurcation (D) and muscle entering point (E) of pronator teres of median nerve. The intersection is point C between ulnar artery and ulnar nerve. Bifurcation between ulnar recurrent artery and ulnar artery is point F. Deep layer: The apex of coronoid process is 0, the bifurcation between articular surface plane and lateral border of ulnar collateral ligaments is as M. Results: AB was (10.37±2.67) cm and BC was (10.19±2.57) cm, AC was (3.03±0.84) cm, AD was (3.53±1.55) cm, AE was (4.61±1.55) cm, AF was (4.96±1.74) cm, BF was (4.51±1.56) cm, AM was (2.75±0.57) cm, OM was (1.59±0.26) cm. Conclusion: This study provided anatomy application foundation for anteromedial-approach exposure of coronoid process fracture and structured a safe zone for anteromedialapproach exposure of coronoid process fracture surgery.