Comparative measurement study of Glenoid Fossa and humeral head in recurrent, traumatic shoulder dislocation and control group

The causative factors of shoulder dislocation are variable and complex. Among these factor, the author studied retrospectively the significance of G/H ratio in three groups; recurrent dislocation, traumatic dislocation and normal contrast group. The results were as follows; 1. The mean value of G/H ratio was 74.1±4.7% in 59 cases of recurrent dislocation, 75.9±3.2% in 11 cases of traumatic dislocation and 78.2±4.6 % in 148 case of control group. 2. There was no significant difference in G/H ratio between recurrent dislocation and traumatic dislocation. (P> 0.05) 3. There was significant difference in G/H ratio between recurrent dislocation and control group.(P< 0.01) 4. There was significant difference in G/H ratio between traumatic dislocation and control group.(P< 0.05) Therefore, small glenoid compared with humeral head (low G/H ratio) was meaningful as one of causative factors in shoulder dislocation