150度挙上位における肩関節回旋可動域について

抄録

The purpose of this study was to investigate the relation of the rotation angle, sports activity and instability of the shoulder. Three hundred and fifty eight shoulders (one hundred and seven males and eighty-one females; average twenty-two years old) were examined with rotation angle and instability. The rotation measurements were made with patients supine and the shoulder at 150 degrees flexion. The range of rotation (ROR) was defined as the sum of the external rotation angle (ER) and internal one (IR) in this position. The ROR, ER and IR angles (92.9, 51.0, 41.9 degrees) of the atraumatic shoulder instability were significantly larger than those (69.6, 46.3, 23.4) of the stable ones (p<0.01). In stable shoulders, the ROR was larger as their ages became younger (10s; 73.7,20s; 70.0,30s; 60.6 degrees). Additionally, the ER angle of the stable dominant shoulder with overhead sports (53.7) was larger than one with no sports (48.6) (p<0.03). Furthermore the ROR of a stable not-dominant shoulder with overhead sports (76.3) was larger than one with no sports (67.1) (p<0.03). In conclusion, the ROR of shoulder was large in the young and increased by instability and / or overhead sports.