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Femoral neck-shaft angle can predict the anterior capsular thickness in patients with femoracetabular impingement syndrome

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Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

To measure the femoral neck-shaft angle (NSA) on computed tomography (CT) images in femoracetabular impingement syndrome (FAIS) patients and explore its relationship with the anterior capsular thickness (ACT).

Methods

A retrospective review of prospectively collected data from 2022 was performed. Inclusion criteria included: primary hip surgery, 18 to 55 years of age, and CT imaging of the hips. Exclusion criteria included: revision hip surgery, mild or borderline hip dysplasia, hip synovitis, and incomplete radiographs and medical records. NSA was measured on CT imaging. ACT was measured using magnetic resonance imaging (MRI). Multiple linear regression was performed to assess the association between ACT and related variables, including age, sex, body mass index (BMI), lateral center–edge angle (LCEA), alpha angle, Beighton test score (BTS), and NSA.

Results

A total of 150 patients were included. The mean age, BMI, and NSA were 35.8 ± 11.2 years, 22.8 ± 3.5, and 129.4° ± 7.7°, respectively. Eighty-five (56.7%) patients were females. Multivariable regression analysis revealed that NSA (P = 0.002) and sex (P = 0.001) were significantly negatively correlated with ACT. Age, BMI, LCEA angle, alpha angle, and BTS were not correlated with ACT.

Conclusions

This study confirmed that NSA significantly predicts ACT. A decrease in the NSA by 1° increases the ACT by 0.24 mm.

Level of evidence

Level III.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by Grants from the National Natural Science Foundation of China (Grant No.82072403, 81902205). We thank senior radiologist Yongye Chen and Zheng Wang for help in CT and MRI measurement.

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Author notes

  1. Hongjie Huang and Jianquan Wang have contributed equally to this paper.

Authors and Affiliations

  1. Department of Sports Medicine, Institute of Sports Medicine of Peking University, Peking University Third Hospital, Beijing, China

    Fan Yang, Zhu Zhang, Xin Zhang, Hongjie Huang & Jianquan Wang

  2. Beijing Key Laboratory of Sports Injuries, Beijing, China

    Fan Yang, Zhu Zhang, Xin Zhang, Hongjie Huang & Jianquan Wang

  3. Engineering Research Center of Sports Trauma Treatment Technology and Devices, Ministry of Education, Beijing, China

    Fan Yang, Zhu Zhang, Xin Zhang, Hongjie Huang & Jianquan Wang

Authors
  1. Fan Yang
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  2. Zhu Zhang
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  3. Xin Zhang
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  4. Hongjie Huang
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Corresponding authors

Correspondence to Hongjie Huang or Jianquan Wang.

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Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Ethical approval

The study was approved by the Ethics Committee of the Peking University Third Hospital (No. M2019193).

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Yang, F., Zhang, Z., Zhang, X. et al. Femoral neck-shaft angle can predict the anterior capsular thickness in patients with femoracetabular impingement syndrome. Knee Surg Sports Traumatol Arthrosc 31, 2716–2720 (2023). https://doi.org/10.1007/s00167-023-07347-6

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