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The MRI sequences demonstrate a deformity of both the glenoid cavity and the humeral head. The glenoid appears flat with loss of its posterior margin (most likely the result the pressure from the humeral head). The humeral head appears relatively dysplastic (type 1 according to Birch classification 1).
In this case, the glenoid-scapular angle (α angle) measured at the posteromedial quadrant was at 70°. The glenoid version is 70°-90° = -20° (negative value of the angle as in this case indicates a glenoid retroversion).
About two-thirds of the humeral head is posterior to the scapular line indicating posterior dislocation.