腱板断裂肩および外傷性前方不安定症肩における肩甲骨関節窩の応力分布 : -CT osteoabsorptiometry法による推測・preliminary study -

概要

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CT osteoabsorptiometry is a method of predicting the long-standing stress distribution by measuring the pattern of subchondral bone density. The purpose of this study was to predict the stress distribution of the glenoid in a normal, rotator cuff tear, and traumatic anterior instability of the shoulder using this method. Sixteen shoulders with rotator cuff tear, 3 contralateral shoulders of which, 5 shoulders with traumatic anterior instability and 8 shoulders as control were prepared for this study. CT values of the glenoid were measured in each coordinate point and mapping data depicted by gray scale were created. The quantitative analysis was based on the ratio of the high bone density area for each zone (central, antero-superior, antero-inferior, postero-superior, postero-inferior) of the glenoid. The high bone density area was located in the antero-inferior and postero-superior zone in the control group. In the cuff tear group, it was located in antero-superior and postero-superior zone. In the anterior instability group, the high bone density area was located in the antero-superior and antero-inferior zone, however, not in the postero-inferior zone. There were different stress distribution patterns between the cuff tear, the anterior instability and the control group. The changes of kinematics of the gleno-humeral joint due to an abnormal condition were considered to be the cause of the difference.
日本肩関節学会の論文