Objective: To testify the spatial relationship between the subscapularis muscle splitting window and the axillary nerve in modified arthroscopic Latarjet procedure, which could provide anatomical basis for the modification of the subscapularis muscle splitting.
Methods: A total of 29 adult cadaveric shoulder specimens were dissected layer by layer, and the axillary nerve was finally confirmed to walk on the front surface of the subscapularis muscle. Keeping the shoulder joint in a neutral position, the Kirschner wire was passed through the subscapularis muscle from back to front at the 4 : 00 position of the right glenoid circle (7 : 00 position of the left glenoid circle), and the anterior exit point (point A, the point of splitting subscapularis muscle during Latarjet procedure) was recorded. The vertical and horizontal distances between point A and the axillary nerve were measured respectively.
Results: In the neutral position of the shoulder joint, the distance between the point A and the axillary nerve was 27.37 (19.80, 34.55) mm in the horizontal plane and 16.67 (12.85, 20.35) mm in the vertical plane.
Conclusion: In the neutral position of the shoulder joint, the possibility of axillary nerve injury will be relatively reduced when radiofrequency is taken from the 4 : 00 position of the right glenoid (7 : 00 position of the left glenoid circle), passing through the subscapularis muscle posteriorly and anteriorly and splitting outward.
目的: 通过尸体标本确定改良关节镜下Latarjet术中肩胛下肌劈裂窗口与腋神经的空间关系，为改良肩胛下肌劈裂方法提供解剖学依据。.
方法: 选取29具成人防腐肩关节标本，逐层解剖并最终确认腋神经于肩胛下肌前方表面走行方向。保持肩关节中立位，用克氏针于右肩关节盂圆4 : 00位置（左肩关节盂圆7 : 00位置）由后往前穿过肩胛下肌，记录前方穿出点（A点，即Latarjet手术过程中肩胛下肌劈裂点），分别测量A点与腋神经的垂直及水平距离。.
结果: 肩关节中立位下，A点与腋神经的水平距离为27.37（19.80，34.55）mm，垂直距离为16.67（12.85，20.35）mm。.
结论: 于肩关节中立位时，采取射频从右肩关节盂圆4 : 00位置（左肩关节盂圆7 : 00位置），由后向前穿过并向外劈裂肩胛下肌时，损伤腋神经的可能性相对较小。.
Keywords: Latarjet procedure; arthroscopy; axillary nerve; glenoid; subscapularis muscle splitting.