Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (24): 3779-3783.doi: 10.12307/2021.079

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A new method for measuring the anteversion angle of the femoral neck by constructing the three-dimensional digital model of the femur 

Liu Jianyou1, Jia Zhongwei2, Niu Jiawei1, Cao Xinjie1, Zhang Dong1, Wei Jie2    

  1. 1Shanxi Medical University, Taiyuan 030001, Shanxi Province, China; 2Department of Orthopedics, People’s Hospital Affiliated to Shanxi Medical University, Taiyuan 030012, Shanxi Province, China
  • Received:2020-10-10 Revised:2020-10-13 Accepted:2020-11-21 Online:2021-08-28 Published:2021-03-05
  • Contact: Wei Jie, Professor, Chief physician, Master’s supervisor, Department of Orthopedics, People’s Hospital Affiliated to Shanxi Medical University, Taiyuan 030012, Shanxi Province, China
  • About author:Liu Jianyou, Master candidate, Shanxi Medical University, Taiyuan 030001, Shanxi Province, China
  • Supported by:
    Joint Cultivation Base for Postgraduate Students of Shanxi Education Department, No. 2017JD20 (to WJ)

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Abstract: BACKGROUND: The accuracy of prosthesis placement in total hip arthroplasty is very important. The classic femoral neck anteversion should be transformed into the relative position of bone markers, and the relevant bone markers may be missing in total hip arthroplasty or revision. We hope to put forward a new method to measure the anterior inclination of the femoral neck, which can be used conveniently in order to improve the accuracy of prosthesis placement.
OBJECTIVE: To propose a new method for measuring the anteversion of the femoral neck through the three-dimensional digital model of the femur, combined with the classical anteversion angle of the femoral neck, to provide anatomical data for the implantation of the femoral stalk prosthesis during complex hip arthroplasty and revision, and to improve the accuracy of prosthesis placement.
METHODS: A total of 82 normal femurs from 41 patients who underwent CT with bilateral femurs aged from 50 to 80 years old were selected as subjects. After the three-dimensional digital model of the femur was reconstructed by software, the surface formed by the most prominent points on the medial epicondyle, the lateral epicondyle, the greater trochanter and the axis of the femoral neck was selected, and the angle between them was our new method for measuring the anteversion of the femoral neck. This new angle was called New Anteversion angle. The corresponding points were taken to measure the New Anteversion angle and the classical anteversion angle on the reconstructed femoral model, and the data were collected and statistically analyzed to find out the relationship between them. 
RESULTS AND CONCLUSION: (1) The data of 82 cases of femur were independently analyzed by t-test according to sex and orientation groups after point measurement. There was no significant difference in the classical anteversion angle between different genders and different sides (P > 0.05), and there was no significant difference in the New Anteversion angle between different genders and different sides (P > 0.05). (2) The average New Anteversion angle was (7.96±1.11)°; the average classical anteversion angle was (13.21±1.28)°. The linear regression equation was: classical anteversion angle = 10.42 ° + 0.35 × New Anteversion angle. (3) It is concluded that both the New Anteversion angle and the classical anteversion angle of the femoral neck can reflect the anteversion of the femoral neck, and there is a corresponding relationship between them in a certain range, and the combination of the two can show the true anteversion of the femoral neck in many dimensions.

Key words: femoral anteversion, hip, total hip arthroplasty, revision, prosthesis implantation, digitization

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