title: Assessment of total hip arthroplasty as a predisposing factor for ischiofemoral impingement.
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.
  
  
  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.
authors.affiliation: Division of Musculoskeletal Imaging and Intervention, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
authors.forename: Adriana L
authors.initials: AL
authors.lastname: Oliveira
authors.affiliation: Division of Musculoskeletal Imaging and Intervention, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
authors.forename: Debora C
authors.initials: DC
authors.lastname: Azevedo
authors.affiliation: Division of Musculoskeletal Imaging and Intervention, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
authors.forename: Alireza
authors.initials: A
authors.lastname: Eajazi
authors.affiliation: Division of Musculoskeletal Imaging and Intervention, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
authors.forename: William E
authors.initials: WE
authors.lastname: Palmer
authors.affiliation: Department of Orthopedics, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
authors.forename: Young-Min
authors.initials: YM
authors.lastname: Kwon
authors.affiliation: Division of Musculoskeletal Imaging and Intervention, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
authors.forename: Miriam A
authors.initials: MA
authors.lastname: Bredella
authors.affiliation: Division of Musculoskeletal Imaging and Intervention, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA. mtorriani@mgh.harvard.edu.|Division of Musculoskeletal Imaging and Intervention Department of Radiology, Massachusetts General Hospital, 55 Fruit Street-YAW 6048, Boston, MA, 02114, USA. mtorriani@mgh.harvard.edu.
authors.forename: Martin
authors.initials: M
authors.lastname: Torriani
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000706:statistics & numerical data*; D001900:Boston / Q000453:epidemiology; D015984:Causality; D005260:Female; D057925:Femoracetabular Impingement / Q000175:diagnosis* / Q000453:epidemiology*; D006801:Humans; D015994:Incidence; D008279:Magnetic Resonance Imaging / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis* / Q000453:epidemiology*; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D014057:Tomography, X-Ray Computed / Q000706:statistics & numerical data; D016896:Treatment Outcome
keywords: Hip; Impingement; Ischiofemoral; MRI; Quadratus femoris; Total hip arthroplasty