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. 2023 Sep 15;15(11):2993–2999. doi: 10.1111/os.13879

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© 2023 The Authors. Orthopaedic Surgery published by Tianjin Hospital and John Wiley & Sons Australia, Ltd.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Plain radiograph of the hip joint showing the seven femoral zones and the three acetabular zones 18 months after operation. Radiolucent line in zone 3 and cortical hypertrophy in zone 2 were observed with no stem subsidence.