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. 2023 Jan 18;9:1097302. doi: 10.3389/fsurg.2022.1097302

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© 2023 Wen, Wang, Ma and Zhao.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Femoral sizing and rotational positioning (A for MA; B for KA). (A) Standard MA rotational positioning device. The measured resection technique was applied for the external rotational positioning in the distal femur depending on Whiteside line (green arrow), transcondylar line (blue double arrow), or setting to 3° external rotation (yellow arrow). (B) Femoral sizer and positioning device of the specific KA instrument. Place the femoral sizer against the resected surface of the distal femur with the posterior feet of the sizer contacting the posterior condyles. The gold slider (blue arrow) is used to size the femur, and the pairs of pin holes (red arrow) on the silver component are posterior reference design parallel to the PCA to ensure an equal resection of the posterior condyles.