Interpretation of ischiofemoral impingement via a clinical test using hip triaxial dynamic magnetic resonance imaging

Quantitative Imaging in Medicine and Surgery

article

Yu-Ping Li¹  Gui-Ping Li¹  Kang Liu¹  Fan Zhao¹  Jia-Jia Zhao¹  Guan-Nan Wang¹  Chang Liu¹ 

[1]Department of Radiology , The Affiliated Hospital of Chengde Medical College

关键词: Hip joint;    ischiofemoral impingement (IFI);    MR;    triaxial motion;    impingement;   

DOI  :  10.21037/qims-21-292

学科分类：外科医学

来源: AME Publications

【 摘 要 】

Background: The present study aimed to use magnetic resonance (MR) to explore the dynamic changes of the ischiofemoral space (IFS) under the triaxial motion of the hip joint and verify the clinical test mechanism for ischiofemoral impingement (IFI). Methods: A prospective design was used to screen 37 patients with clinically confirmed IFI, which included a total of 67 lateral hips, and 39 healthy controls with a total of 69 lateral hips. A dynamic MR examination was performed in positions designed by a simulated IFI test (adduction, adduction with 30° external rotation, 30° internal rotation, supine with 30° flexion, and prone with 30° backward extension). The IFS (mm) and quadratus femoris space (QFS, mm) were measured in different positions. All the data were evaluated independently by three musculoskeletal radiologists. The differences between the two groups were compared using the two-tailed t-test. Results: The IFS and QFS in the case group were smaller than those in the control group. The IFS and QFS were significantly reduced in the prone with backward extension and adduction with external rotation positions of the hip. The correlation coefficients of the IFI test and long-stride walking (LSW) test were –0.621 and –0.715 for IFS and –0.653 and –0.696 for QFS, respectively. Conclusions: In this study, the mechanism of the IFI-specific clinical examination (IFI and LSW tests) was verified by triaxial dynamic MR imaging of the hip joint, which provided a dynamic imaging basis for the clinical application of the IFI-specific impingement test. The IFI impingement test can be used as a specific clinical test for IFI screening.

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