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Fig. 4 | Journal of Orthopaedic Surgery and Research

Fig. 4

From: Analysis of factors that affect the precision of the radiographic lateral femoral bowing angle using a three-dimensional computed tomography-based modelling technique

Fig. 4

Plane a: axial plane; Plane b: coronal plane ; Plane c: sagittal plane ; Plane d: arc plane. Angle A: angle between arc plane and coronal plane; Angle B: angle between arc plane and sagittal plane. The arc plane is the formed by the fitted arc of central point and the femoral medullary cavity; thus, the arc is commonly influenced by both the femoral anterior bowing and lateral bowing. For the femur, the lateral bowing is often accompanied by anterior bowing; therefore, it is not appropriate to analyse each one of them at a time. The angle between the femoral sagittal plane and the arc plane (defined as 3D lateral femoral bowing index) can clearly reflect the lateral bowing degree of the femur. That is, the larger the femoral anatomy of the lateral bowing, the greater the 3D lateral femoral bowing index. While the angle between the arc plane and the coronal plane of the femur reflects the anterior arch degree of the femur. That is, the larger the anterior arch of the femur, the greater the angle between the arc plane and the coronal plane

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