The Scapula : Osseous Dimensions and Gender Dimorphism in Thais

Abstract

Anatomic and morphometric study of the scapula in Thais was aimed to provide fundamental information for surgical procedures such as fixation device selection, arthrocopic portal placement, prosthetic design and positioning. Therty measurements were carried in 97 scapulas, 25 pairs from female and 23 pairs and one left side from male cadavers. The average age at the time of death was 69.82 years. The average length of scapula measured from the superior angle to the inferior angle was 13.93 ± 1.11 cm. (mean+standard deviation). The thickness of the lateral border taken from the midpoint and 1 cm. from the edge was 0.82 ± 0.20 cm. thicker than the medial border taken in the same manner (0.12 ± 0.08 cm.). The inferior angle was more acute at 40.88 ± 5.29 degrees and thicker than the superior angle (84.29 ± 9.43 degrees). The superior border was thin and sharp; the suprascapular notch was presented on the border medial to the root of the coracoid process. The depth and shape of the suprascapular notch were variable. The length of the spin measured from the tip of the acromion process to its medial edge was 12.89 ± 0.94 cm. The anteroposterior width of the spine measured were 0.60 ± 0.15 and 1.78 ± 0.29 cm. taken from 1 and 4 cm. away from its medial edge, respectively, and 4.15 ± 0.43 cm. width meansured in the plane of the spinoglenoid notch. The dimensions of the acromion of the acromion process were 4.41 ± 0.47 cm. X 2.50+0.37 cm. (L x W x T). The distance between the acromion and coracoid processes was 3.11 ± 0.41 cm. The coracoids measurements were 4.04 ± 0.41 cm. X 1.46 ± 0.19 cm. X 0.74 ± 0.12 cm. (L x W x T). The distance measured from the tip of the coracoid process to the bottom of suprascapular notch was 4.84 ± 0.39 cm. The glenoid dimensions were 3.58+0.35 (superoinferior) and 2.73 ± 0.31 cm. (anteroposterior). The thickness of the scapula neck was 1.91 ± 0.37 and 1.02 ± 0.27 cm. at 1 and 2 cm. away from the glenoid rims. Scapulas from male cadavers were significantly larger than those from female cadavers in 27 meansurements.