Femoral Neck Anteversion Measured Using a 3D CT Scan Perpendicular to the Mechanical Axis of the Femur
기계적 축에 수직으로 재구성된 삼차원 단층 촬영 영상을 이용하여 측정한 대퇴 경부 전염각의 측정
Kim, KK; Roh, JY; Kim, SB; Lee, WS; Won, YY; Chae, DS
Taehan Ko Kwanjŏl Hakhoe chi, 23(1):47-53, 2011
Taehan Ko Kwanjŏl Hakhoe chi; The Journal of the Korean Hip Society; 대한고관절학회지
Purpose: We wanted to measure the femoral neck anteversion (FNA) angles using a 3D CT scan that perpendicularly cut the mechanical axis of the femur and to assess the accuracy and reproducibility of different measuring methods. Materials and
Methods: We obtained 95 cases of 3D CT images of the cross-section perpendicular to the mechanical axis of the femur. The methods used to measure the FNA angles included a method using the CT image of the area where the femoral neck is confluent to the greater trochanter (method 1), a method using the CT image taken from the neck base immediately prior to the beginning of the area of the lesser trochanter (method 2) and a method by which measurements are made after putting 3D bone models on a horizontal plane in virtual space (method 3). The reference axes of the distal femur we used were the anatomical transepicondylar axis, the surgical transepicondylar axis and the real posterior condylar axis.
Results: The FNA angles measured by method 1 were 4.79±6.41。to the anatomical transepicondylar axis (ATEA), 6.09±6.58。to the surgical transepicondylar axis (STEA) and 7.96±6.81。to the real posterior condylar axis (rPCA). The FNA angles measured by method 2 were 16.01±8.31。to the ATEA, 19.52±8.38。to the STEA and 21.79± 8.52。to the rPCA. The FNA angles measured by method 3 were 20.15±12.89。to the rPCA.
Conclusion: The measurement of the FNA angle using a 3D CT scan perpendicular to the mechanical axis is reproducible. The measurement method on the neck base level is more reliable than the one on the proximal neck confluence, and more similar to the measurement method by classic definition. Key Words: Femur, Anteversion angle, Mechanical axis, Computed tomography
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