Fig. 6

A representative case of borderline DDH These images are of a 47-year-old woman with borderline DDH with cam deformity in the right hip and borderline DDH without cam deformity in the left hip. The CE angle in the right hip was 21° and that in the left was 24° (a). The alpha angle in the right hip was 67° (b) and that in the left was 51° (c). Impingement points are identified by arrows (d, e). The preoperative maximum internal rotation angle for both hip joints was 49°. The internal rotation angle in the right hip after slight resection was 53°, whereas that after sufficient resection was 65° (d). The final improvement in the internal rotation angle of the right hip joint was 16°. However, the internal rotation angle in the left hip after sufficient resection was 52° (e). Thus, the final improvement in the internal rotation angle of the left hip joint was 3°