CTを用いた上腕骨後捻角計測：第5報−関節窩傾斜角との関係−

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The purpose of this study was to examine the correlation between the humeral head retroversion and the glenoid tilting angle measured using computed tomography (CT). CTs were done on 64 shoulders of 32 healthy volunteers and 50 shoulders (normal side) of the 50 patients with unilateral posttraumatic recurrent anterior dislocation. The humeral head retroversion was determined with the humeral head axis and the cubital axis. We adopted our original measuring method utilizing Nobuharas anatomical axis to draw the humeral head axis. The cubital axis was drawn as the tangent to the articular surface. We adopted Randellis method to determine the glenoid version. The glenoid tilting angle was recorded as a positive value if the glenoid was open anteriorly (anteversion). We also examined the differences between the dominant and non-dominant sides. The mean value of the humeral head retroversion was 32.3±9.5°(12.4∼57.2°), and that of the glenoid tilt was -0.7±3.4°(0∼7.0°). There was no evident correlation between them as evaluated with Spearmans rank correlation (rs=0.31, p=0.01). There were 30 cases of right-handed and 2cases of left-handed. The mean value of the retroversion on the dominant side was larger than that of the non-dominant side. There was a significant difference between them as evaluated with unpaired t-test (p<0.01). In the non-dominant side group, there was moderate correlation between the humeral head retroversion and the glenoid tilt (rs=0.55, p=0.001), on the other hand, in the dominant side group, there was no evident correlation between them (rs=0.20, p=0.46). It is possible that some acquired elements affect the development of humeral torsion other than the glenoid tilt.
日本肩関節学会の論文

CTを用いた上腕骨後捻角計測：第5報−関節窩傾斜角との関係−

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