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Using Anatomic Landmarks to Locate Schöttle’s Point Was Accurate Without Fluoroscopy During Medial Patellofemoral Ligament Reconstruction

  • Hai-Jun Wang
    Affiliations
    Sports Medicine Department, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, Beijing, China. Institute of Sports Medicine of Peking University, Beijing, China
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  • Yi-Fan Song
    Affiliations
    Sports Medicine Department, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, Beijing, China. Institute of Sports Medicine of Peking University, Beijing, China
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  • Xin Yan
    Affiliations
    Sports Medicine Department, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, Beijing, China. Institute of Sports Medicine of Peking University, Beijing, China
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  • Fei Wang
    Affiliations
    Department of Joint Surgery, The Third Hospital of Heibei Medical University, Shijiazhuang, China
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  • Jian Wang
    Affiliations
    Sports Medicine Department, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, Beijing, China. Institute of Sports Medicine of Peking University, Beijing, China
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  • Yong-Jian Wang
    Affiliations
    Sports Medicine Department, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, Beijing, China. Institute of Sports Medicine of Peking University, Beijing, China
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  • Lin Lin
    Affiliations
    Sports Medicine Department, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, Beijing, China. Institute of Sports Medicine of Peking University, Beijing, China
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  • Yang Liu
    Affiliations
    Sports Medicine Department, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, Beijing, China. Institute of Sports Medicine of Peking University, Beijing, China
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  • Song-Bo Han
    Affiliations
    Department of Radiology, Peking University Third Hospital, Beijing, China
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  • Jia-Kuo Yu
    Correspondence
    Address correspondence to Jia-Kuo Yu, M.D., Sports Medicine Department, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, Beijing, China. Institute of Sports Medicine of Peking University, Beijing, China, No. 49 North Garden Road, Haidian, Beijing, China 100191.
    Affiliations
    Sports Medicine Department, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, Beijing, China. Institute of Sports Medicine of Peking University, Beijing, China
    Search for articles by this author
Published:February 01, 2021DOI:https://doi.org/10.1016/j.arthro.2021.01.041

      Abstract

      Purpose

      The purpose of the present study was to analyze the anatomic landmarks of Schöttle’s point and establish a locating method for identification.

      Methods

      From 2013 to 2016, patients undergoing medial patellofemoral ligament (MPFL) reconstruction for patellofemoral instability were enrolled. Inclusion criteria: at least 2 episodes of patellar dislocation. Exclusion criteria: previous knee surgeries, open physes, severe trochlear dysplasia, tibial tuberosity lateralization, or patella alta. Group A: From January 2013 to December 2013, preoperative 3-dimensional computed tomography (3D-CT) images were obtained. Anatomic features of Schöttle’s point were measured on the 3D-CT images. A Schöttle’s point locating method with 2 distinct landmarks was established. Group B: From January 2014 to January 2016, consecutive MPFL reconstructions were performed. The placement of Schöttle’s point was following the established method without fluoroscopy. The accuracy of femoral tunnel positions was assessed on the 3D-CT images postoperatively.

      Results

      CT images of 53 knees were obtained in group A. Forty-seven MPFL reconstructions were performed in group B. No significant difference was found between the 2 groups regarding to demographic characteristics. The intraclass correlation coefficients were excellent for all measures (r = 0.97). In group A, Schöttle’s point was 8.1 ± 0.2 mm (95% confidence interval [CI], 7.7-8.5) distal to the apex of the adductor tubercle and 8.0 ± 0.3 mm (95% CI, 7.4-8.6) anterior to the posterior edge. Apex of the adductor tubercle was defined as the most convex point, and posterior edge was defined as the edge of the posteromedial cortex in the transition area between the medial condyle and femoral shaft. In group B, 44 of 47 femoral tunnels (93.6%) were considered localized in the proper zone.

      Conclusions

      Schöttle’s point was approximately 8 mm distal to the apex of the adductor tubercle and 8 mm from the posterior edge. Schöttle’s point locating method without fluoroscopy had high accuracy.

      Level of Evidence

      Level IV, case series.
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