ABSTRACT
Objective To observe the anatomical structure of spinoglenoid notch of scapula by 3D reconstruction of normal adult scapula by computed tomography (CT), and to provide reference for clinical assessment of suprascapular nerve compression risk, suprascapular nerve compression treatment and shoulder joint operation. Methods Totally 335 cases of normal adult scapula were reconstructed by CT, and classified according to the anatomical shape of spinoglenoid notch; the spinoglenoid notch width (MN), spinoglenoid notch depth (OP), spinoglenoid notch thickness (XY), spinoglenoid notch angle (Z.M0N), distance from 0 point to the inner upper corner of scapula (0A), distance from 0 point to medial lateral edge of scapula (OB), distance from 0 point to inferior angle of scapula (OC) and distance from 0 point to the lowest point of suprascapular notch (OD) were observed and analyzed. Results 1. The morphology of spinoglenoid notch was divided into four types; U type (41. 79%), fin type (42. 99%), L type (8. 36%) and ladder type (6. 86%). U type and fin type were the most common types. Comparison of the four shapes; fin type was the narrowest (11.58 ± 1.74) mm and the deepest (14.58 ± 1.81) mm, the /_ M0N was the smallest (45.62 ± 6.43) ° and the ladder type was the widest (14. 20 ± 2. 67) mm and the shallowest (10. 80 ± 0. 79) mm, the Z.MON was maximum (57. 69 ± 2. 22) ° and the least prone to suprascapular nerve compression. 2. There was no significant difference in MN, OP, XY, zlMON, OA, OB, 0C and OD between left and right sides. 3. The data of MN, OP, XY, OA, OB, OC and OD of men were larger than those of women significantly, but Z. MON was smaller than that of women, indicating that men' s spinoglenoid notch was thicker, wider and deeper, and scapula was wider and longer than that of women. Conclusion The measurement of the morphological and anatomical characteristics of spinoglenoid notch with CT three-dimensional reconstruction is helpful to evaluate the risk of suprascapular nerve compression, the treatment of suprascapular nerve compression, and provide guidance for clinical shoulder surgery.
ABSTRACT
Suprascapular nerve injury restricted to the infraspinatus muscle is an uncommon condition. We present a 29 year-old man who complained of right shoulder pain and weakness for 8 months. Physical examination revealed atrophy of right infraspinatus muscle and T2 weighted MRI of the right shoulder revealed a mass with homogeneous high intensity at the spinoglenoid notch and atrophy of right infraspinatus muscle. EMG study revealed abnormal spontaneous activities and reduced recruitment pattern of motor units in right infraspinatus muscle. Symptoms improved after the excision of a mass which was a ganglion cyst by pathologic examination. We were reporting a case of suprascapular nerve injury restricted to the infraspinatus muscle.