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Abstract Objective To investigate the clinical effect of rotatory osteotomy at the base of femoral neck assisted by 3D printing osteotomy guide and femoral head rotation angle measuring device.Methods From June 2019 to June 2022，a total of 3 male patients were included in the study.One patient had a right-sided lesion，while two had left-sided lesions.Their ages were 48，31，and 41 years，respectively.Prior to surgery，the rotation axis of the femoral neck and the rotation angle of the necrotic area of the femoral head were precisely calculated.Based on the principles of reverse engineering，a customized surgical dislocation guide and basal femoral neck osteotomy template were designed.Intraoperatively，the necrotic area of the femoral head was rotated precisely using a self-developed femoral head rotation angle measuring device.The intraoperative blood loss，operation time，and any postoperative complications were carefully recorded.The hip function of each patient was evaluated using the Harris hip score both before surgery and at the final follow-up after surgery.Results The application of the 3D printing-guided osteotomy template and femoral head rotation angle measuring device resulted in successful rotatory osteotomy in all three patients.The follow-up durations were 24 months，20 months，and 35 months，respectively.Intraoperatively，the blood loss was 300 mL，and the operation times were 130 minutes，180 minutes，and 205 minutes.Preoperatively，the Harris hip scores were 83，74，and 78 points，respectively.At the final follow-up，the Harris hip scores had improved to 94 points，86 points，and 83 points.Postoperative X-ray images revealed excellent rotation and fixation positions，and no complications were observed.Conclusion The combined use of a 3D printed guide and a femoral head rotation angle measuring device has the potential to transform traditional orthopedic surgery into a more quantifiable and standardized precision operation.This approach offers surgeons an effective new method for rapid positioning and precise osteotomy，promising to enhance the overall clinical outcomes of orthopedic procedures.
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Corresponding Authors:
Chen Liang
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