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Patella shift was defined as the distance between the intercondylar sulcus and the median ridge of the patella. Pre‐ and postoperative patellar shift angles were also measured in Merchant's view, taken with the knee joint flexed at 30°, 60°, and 90°. When the median ridge of the patella was on the lateral side relative to the intercondylar sulcus, we defined the shift as a positive value; otherwise, it was considered a negative value 24 . We defined the patellar shift more than ±5 mm as patellar maltracking.
Copyright and License information: ©2021 The Authors. Orthopaedic Surgery 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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