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The Gruen classification is a system for evaluating periprosthetic bone changes around the femoral stem 27 . There are seven areas in this classification system: Zone 1, greater trochanter; Zone 2, proximal lateral; Zone 3, distal lateral; Zone 4, tip; Zone 5, distal medial; Zone 6, proximal medial; and Zone 7, calcar region. With the help of specialized software, DEXA can be used to analyze BMD changes in these zones automatically.
Copyright and License information: ©2021 The Authors. published by Chinese Orthopaedic Association 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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