20 歳以下の肩甲骨二次骨化核に対する CT 画像評価

概要

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Background: A few studies have investigated the age ranges of the appearance and fusion of the secondary ossification centers (2nd OCs) of the scapula. The purpose of this study is to examine the age ranges in which each 2nd OC of the scapula appears and fuses by CT images. Methods: This study included 41 shoulders of 27 patients of 20 years old or less (range; 9 to 20, 25 patients > 14 years old). They were 21 males and 6 females with surgery for traumatic anterior shoulder instability in most cases. CT images were analyzed for the appearance and fusion of each 2nd OC. Results: The 2nd OC of the acromion and coracoid process appeared in all shoulders except one shoulder of a 9 year-old boy and fused in 38 of 41 shoulders. The 2nd OC of the glenoid rim and scapula medial border fused in 34 and 40 shoulders, respectively. Conclusion: In past papers, the age ranges of the 2nd OC appearance were from 15 to19 years old and those of fusion were from 18 to 25 years old. This study revealed that most of the 2nd OC in the scapula of Japanese people of today, evaluated by CT images, appeared by 15 and fused by 16 years old. In cases of unfused 2nd OCs of people of 16 years or older, we need to suspect os acromiale or epiphysial injuries.