Abstract
Objective
To examine the effect of total hip arthroplasty (THA) on ischiofemoral (IF) and quadratus femoris (QF) spaces with the hypothesis that THA does not affect ischiofemoral relationships.
Materials and methods
The study was IRB approved and complied with HIPAA guidelines. We identified consecutive MR examinations (pelvis and/or hip) obtained at our institution in adults (≥18 years old) screened for THA-related complications. Native hips from the same individuals served as controls. We collected medical record data including age, gender, surgical history, and THA designs. Two radiologists independently measured the IF-RAD and IF-MRI (IF space on radiographs and MR imaging, respectively) and QF space (on MR imaging). Groups were compared using ANCOVA controlled for gender.
Results
The study group comprised 250 hips (132 subjects; 162 post-THA and 88 native hips). Subjects were aged 59 ± 10 years, with 66 males and 66 females. Comparison of IF-MRI and QF spaces between native and post-THA hips showed no differences (P > 0.12) and IF-RAD was higher in post-THA subjects (P = 0.01). No differences in the IF-MRI and QF spaces were present between native hips and different THA designs (P > 0.4). IF-RAD of metal-on-metal THA was higher than that of native hips (P = 0.01) and trended higher than ceramic-on-polyethylene THA (P = 0.08), with the remaining comparisons showing no significant differences (P > 0.4).
Conclusions
Radiographic- and MRI-based measures in patients with standard THA do not show narrowing of IF and QF spaces.
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Oliveira, A.L., Azevedo, D.C., Eajazi, A. et al. Assessment of total hip arthroplasty as a predisposing factor for ischiofemoral impingement. Skeletal Radiol 44, 1755–1760 (2015). https://doi.org/10.1007/s00256-015-2229-y
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DOI: https://doi.org/10.1007/s00256-015-2229-y