抄録
The purpose of this study was to determine the stability ratio in various directions of the glenoid and to correlate them with the glenoid depth. 9 fresh frozen cadaveric shoulders were used. All soft tissues were removed and the glenoid was mounted horizontally on a 6-component load cell while the humerus was vertically clamped to a device. A 50-N compressive load was applied. Measurement was performed in 40 different directions and repeated twice. The glenoid depth was measured by a LASER sensor in 8 directions. The forces resisting translation were recorded. Then the stability ratio, defined as the peak translational force divided by the applied compressive force, was calculated. Pearson's correlation coefficient was used to evaluate the relationships between the stability ratio and the glenoid depth. The stability ratio was greater in the superoinferior direction than in the anteroposterior direction. The greatest stability ratio was detected in the inferior direction (52.9% at 180°) and the superior direction (48.3% at 10°). On the other hand, the smallest stability ratio was detected in the anterior direction (27.1% at 90°) and the posterior direction (26.2% at 280°). The glenoid concavity was deepest in the superoinferior direction and shallowest in the anteroposterior direction. A positive strong correlation was observed between the stability ratio and the glenoid depth (r=0.92, p=0.001). The stability ratio was greatest in the superoinferior direction and smallest in the anteroposterior direction. The glenoid depth was strongly correlated with the stability ratio.
