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An abnormal femoral anteversion angle is associated with a variety of clinical problems ranging from in-toeing gait in early childhood to disabling osteoarthritis of the hip and knee in adulthoods. Accurate evaluation of femoral anteversion is essential to inform the decision for surgical correction. In children, the indication for surgery is an age of eight years or older with the measured anteversion above 50 degrees and medial hip rotation above 85 degrees [1]. Many imaging methods have been used to measure femoral anteversion, such as two-dimensional (2D) computed tomography (CT), magnetic resonance (MR) or ultrasound (US) imaging, and three-dimensional (3D) modeling [2-9]. More recently, measurement of axial-oblique reformations parallel to the long axis of the femoral neck was introduced and reported to lead to more accurate measurement of femoral anteversion than conventional 2D imaging [10-12]. However, there is still no consensus on the imaging modality of choice. This study aimed to define a more accurate CT scanning method for measurement of the anteversion angle of the femoral neck. Received: March 24, 2020 Revised: May 13, 2020 Accepted: May 15, 2020

Computed Tomography in Evaluation of Femoral Anteversion: Transverse Section Versus Axial Oblique Section