Abstract
Purpose
To verify the relationship between muscle volumelateral centre-edge angle (LCEA)alpha angle (AA)body mass index (BMI) and Beighton score with stiffness coefficient (SC). To analyse the difference of traction force at different physical states of hip joint capsule.
Methods
Thirty-six patients who underwent hip arthroscopy operation were included. The volumes of some related muscles were measured in MRI images by 3D Slicer. We recorded and tested differences in traction force of five joint capsule physical statesincluding before (State 1) and after joint capsule puncture (State 2)after the establishment of anterolateral and mid-anterior approaches (State 3) and after incision of the joint capsule through these two approaches (States 45). The correlation between muscle volumeBMILCEAAA and SC was verified by Spearman test. Poisson regression was used to explain confounding variables.
Results
The average force at State 1 was 531.8 N. There were significant differences in traction force between these five states (p < 0.001). There was a significant positive correlation between muscle volumes and SC (p < 0.001). BMI had no correlation with SC (n.s.). The preoperative LCEA of the affected side was correlated with SC (p = 0.043). AA and SC were not correlated (n.s.).
Conclusion
The physical states of the hip joint capsule affected traction force. Muscle volume rather than BMI is an ideal index to estimate preoperative traction force. LCEA affected traction forcewhilst AA and Beighton score did not. Measuring the muscle volume can help estimate the most suitable traction force for the patient.
Levels of evidence
IV.



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Data Availability Statement
The datasets generated during and analysed 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 Clinical Medicine Plus X—Young Scholars ProjectPeking Universitythe Fundamental Research Funds for the Central Universities (No. PKU2022LCXQ005; PKU2022LCXQ015) and the National Natural Science Foundation of China (No. 81902205No. 82072403).
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Partial financial support was received from funds of the Sports Medicine Department of the Third Hospital of Peking University. There are no any relevant conflicts of interest. The authors declare they have no financial interests. The authors have no relevant financial or non-financial interests to disclose.
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This study was approved by the Ethics Committee of Peking University Third HospitalBeijingChina (Approval number IRB-M2019193).
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YinY.XueS.ZhangX. et al. The traction force of the pulled limb in hip arthroscopic surgery is determined by stiffness coefficient which is significantly related to muscle volume. Knee Surg Sports Traumatol Arthrosc 312708–2715 (2023). https://doi.org/10.1007/s00167-022-07261-3
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DOI: https://doi.org/10.1007/s00167-022-07261-3


