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ORIGINAL ARTICLE
Year : 2020  |  Volume : 6  |  Issue : 2  |  Page : 121-125

Defining the anatomic axis joint center distance and anatomic axis joint center ratio of the distal femur in the coronal plane


Department of Surgical Sciences, Division of Orthopaedic Surgery, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa

Correspondence Address:
Prof. Nando Ferreira
Department of Surgical Sciences, Division of Orthopaedic Surgery, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, 7505
South Africa
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2455-3719.305862

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Background: The aim of this radiographic study was to define the anatomic axis joint center distance (aJCD) and anatomic axis joint center ratio (aJCR) of the distal femur in the coronal plane for skeletally mature individuals. Methods: A cross-sectional radiographic study was conducted to calculate the horizontal distances between the anatomical axis and the center of the knee at the level of the intercondylar notch and the joint line. Ratios relating these points to the width of the femur were then calculated. Results: A total of 164 radiographs were included: 91 male (55.5%) and 73 female patients (44.5%) with a mean age of 44.9 ± 18.1 years, with 79 right (48.2%) and 85 left (51.8%). The mean intercondylar width was 75.6 ± 6.6 mm, the mean aJCD at the notch was 3.6 ± 1.8 mm, the mean aJCD at the joint line was 4.9 ± 1.8 mm, the mean aJCR at the notch was 45.2 ± 2.4, and the mean aJCR at the joint line was 43.5 ± 2.4. The intercondylar width was significantly different (P < 0.001) between males (79.5 ± 4.8 mm) and females (70.6 ± 5.0 mm). A significant difference between the aJCR at the notch (P = 0.004) and the aJCR at the joint line (P = 0.003) was observed in males and females. No differences between the aJCD at the notch and/or aJCD at the joint line were observed between males versus females, left versus right, and those younger versus those older than 65 years. Conclusion: This is the first objective description of the aJCR of the distal femur in the coronal plane. This ratio can be used to aid the planning and execution of distal femoral deformity correction, retrograde femoral nailing, and total knee arthroplasty. Level of Evidence: IV


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