Can Anatomic Measurements of Stem Anteversion Angle Be Considered as the Functional Anteversion Angle?

Stem anteversion angle is important in the combined anteversion theory to avoid implant impingement after total hip arthroplasty (THA). However, anatomic measurements of stem anteversion angle may not represent functional anteversion of the femur if the femur undergoes axial rotation. Herein, the fe...

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Bibliographic Details
Published in:The Journal of arthroplasty 2018-02, Vol.33 (2), p.595-600
Main Authors: Uemura, Keisuke, Takao, Masaki, Otake, Yoshito, Koyama, Koki, Yokota, Futoshi, Hamada, Hidetoshi, Sakai, Takashi, Sato, Yoshinobu, Sugano, Nobuhiko
Format: Article
Language:English
Subjects:
2D-3D registration
Aged
Arthroplasty, Replacement, Hip - methods
axial rotation
Bone Anteversion - diagnostic imaging
Bone Anteversion - physiopathology
Case-Control Studies
Female
femoral anteversion
Femur - anatomy & histology
Femur - diagnostic imaging
Femur - surgery
functional femoral anteversion
Hip Prosthesis
Humans
Male
Middle Aged
Osteoarthritis, Hip - diagnostic imaging
Osteoarthritis, Hip - physiopathology
Osteoarthritis, Hip - surgery
Retrospective Studies
Rotation
stem anteversion
Tomography, X-Ray Computed
total hip arthroplasty
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Summary:Stem anteversion angle is important in the combined anteversion theory to avoid implant impingement after total hip arthroplasty (THA). However, anatomic measurements of stem anteversion angle may not represent functional anteversion of the femur if the femur undergoes axial rotation. Herein, the femoral rotational angle (FRA) was measured in supine and standing positions before and after THA to evaluate the difference between anatomic and functional measurements. A total of 191 hips (174 patients) treated with THA for osteoarthritis were analyzed in this retrospective, case-controlled study. The FRA was measured as the angle between the posterior condylar line and the line through the bilateral anterior superior iliac spines (positive for external rotation) and was measured preoperatively and postoperatively in supine and standing positions with computed tomography segmentation and landmark localization of the pelvis and the femur followed by intensity-based 2D-3D registration. The number of cases in which the absolute FRA remained
ISSN:0883-5403
1532-8406
DOI:10.1016/j.arth.2017.09.027