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Table 2 Radiographic classification of glenohumeral deformity (Waters and Peljovich).

From: Does preoperative abduction value affect functional outcome of combined muscle transfer and release procedures in obstetrical palsy patients with shoulder involvement?

Type I Normal glenoid (<5° retroversion difference versus contralateral normal)
Type II Minimal deformity (>5° retroversion difference)
Type III Moderate deformity (posterior humeral head subluxation)
Type IV Severe deformity (posterior humeral head subluxation with false glenoid)
Type V Severe flattening of humeral head and glenoid +/- complete dislocation
Type VI Infantile glenohumeral dislocation
Type VII Proximal humeral growth arrest