CT画像を用いたゼロポジション肢位における肩甲上腕関節内外旋可動域計測

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Total rotational angle of the gleno-humeral joint is considered to decrease as the arm is elevated. Meanwhile the shoulder rotates widely from the external position to the internal position around the Zero position during throwing. Measurement of true rotational angle of the gleno-humeral joint is considered to be difficult using goniometer because of the scapular motion. The purpose of this study is to measure the rotational angle of the shoulder at the Zero position (RAZ) on digital photo, CT images and using in vivo motion analysis system. Ten shoulders of 10 healthy volunteers (all men, mean age 28.7 years old) were evaluated. Digital photos of the shoulder and CT images were taken with the arm in the maximum external and internal rotation at the Zero position in supine position. Exterior total (E-ROM) was measured on the digital photo. The true RAZ of the gleno-humeral joint was measured on the sagittal reconstructed CT images (CT-ROM) and using in vivo motion analysis system (3D-ROM). The average E-ROM was 102.7 degrees (range, 78.0-125.0degrees). The average CT-ROM was 63.9 degrees (range, 40.0-96.8degrees). The average 3D-ROM was 72.0 degrees (range, 46.3-87.7degrees). E-ROM/CT-ROM ratio averaged 0.62 (range, 0.40-0.78). E-ROM/3D-ROM ratio averaged 0.70 (range, 0.46-0.88). In conclusion, measurement using CT image showed relatively large rotational angle of the gleno-humeral joint at the Zero position with relatively large individual variations.

CT画像を用いたゼロポジション肢位における肩甲上腕関節内外旋可動域計測

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