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(A) Bilateral IIIA defects are seen. The THAs were performed in 1978 when the patient was 32 years old. (B) The right hip is 4 years postoperative, and the left 3 years. Note the use of bipolar heads over the retained nonmodular femoral component. The less than 1 mm gap in Zone C of the left acetabulum (arrow) is being monitored.
