Objective To explore morphological classification of scapular spine based on three-dimensional reconstruction of CT and its clinical significance. Methods Three hundred and nineteen patients (179 cases of left shoulder and 140 cases of right shoulder) from the department of Radiology in the affiliated Hospital of Zunyi Medical College were scanned by CT, and then the three-dimensional reconstruction and classification of the affected scapular spine were performed. It was assumed that the point of intersection between the medial end of the scapular spine and the medial margin of the scapula was point A. The intersection of the glenoid notch and the superior margin of the scapular spine was point B. The glenoid notch was point C. The medial edge of the acromion was point D. The lateral edge of the acromion was point E. The inner 1/3 point of AB was point F. The inner 1/3 point of AC was point G. The outer 1/3 point of AB was point H, the outer 1/3 point of AC was point I, the midpoint of FG was point J, the midpoint of HI was point K, the midpoint of BC was point L. Research parameters were the following: the distance between point A and point B, point A and point C, point A and point D, point A and point E, point B and point C, point H and point I, point F and point G, and the thickness of B, H, F, L, K, J, E, I, G. Results The shape of the inferior scapular spine reconstructed by CT can be divided into 6 types: large fusiform-type, small fusiform-type, wooden club-type, thick rod-type, S-type and slender rod-type. The length of AE, BC, AC and AD in large fusiform-type, wooden club-type and thick rod-type was longer than that of small fusiform-type, S-type and slender rod-type. The length of AB in large fusiform-type was longer than that of wooden club-type and slender rod-type (P<0.05). The height of FG in large fusiform-type was higher than that in small fusiform-type. The height of HI in large fusiform-type was higher than that of all other types (P<0.05). The thickness of B, C, H, K, I, F, J and Gin large fusiform-type and thick rod-type were thicker than those of slender rod -type and small fusiform-type (P<0.05). Conclusions The scapular spine can be divided into 6 types based on the CT three-dimensional reconstruction: large fusiform-type, small fusiform-type, wooden club-type, thick rod-type, S-type and slender rod-type. Different morphological types of scapular spine provide anatomical basis for clinicians to choose internal fixation and operation methods.
Key words
Scapular spine /
Anatomic morphology /
CT three-dimensional reconstruction
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