title: Does previous hip arthroscopy negatively influence the short term clinical result of total hip replacement?
abstract: BACKGROUND
  The risk that hip preserving surgery may negatively influence the performance and outcome of subsequent total hip replacement (THR) remains a concern. The aim of this study was to identify any negative impact of previous hip arthroscopy on THR.
  
  
  METHODS
  Out of 1271 consecutive patients who underwent primary THR between 2005 and 2009, 18 had previously undergone ipsilateral hip arthroscopy. This study group (STG) was compared with two control groups (CG, same approach, identical implants; MCG, paired group matched for age, BMI and Charnley categories). Operative time, blood loss, evidence of heterotopic bone and implant loosening at follow-up were compared between the STG and the MCG. Follow-up WOMAC were compared between the three groups.
  
  
  RESULTS
  Blood loss was not found to be significantly different between the STG and MCG. The operative time was significantly less (p < 0.001) in the STG. There was no significant difference in follow-up WOMAC between the groups. No implant related complications were noted in follow-up radiographs. Two minor complications were documented for the STG and three for the MCG.
  
  
  CONCLUSIONS
  We have found no evidence that previous hip arthroscopy negatively influences the performance or short-term clinical outcome of THR.
authors.affiliation: Department of Orthopaedics, Balgrist, University of Zurich, Forchstrasse 340, Zurich, Switzerland. patrick.zingg@balgrist.ch
authors.forename: Patrick O
authors.initials: PO
authors.lastname: Zingg
authors.forename: Alex
authors.initials: A
authors.lastname: Schallberger
authors.forename: Hannes A
authors.initials: HA
authors.lastname: Rüdiger
authors.forename: Vaughan
authors.initials: V
authors.lastname: Poutawera
authors.forename: Claudio
authors.initials: C
authors.lastname: Dora
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D001182:Arthroscopy / Q000009:adverse effects; D016063:Blood Loss, Surgical; D005260:Female; D006621:Hip Joint / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009999:Ossification, Heterotopic / Q000209:etiology; D011475:Prosthesis Failure / Q000209:etiology