title: Factors associated with the failure of arthroscopic surgery treatment in patients with femoroacetabular impingement: A cohort study.
abstract: OBJECTIVE
  The aim of this study was to evaluate the association of the anatomical and functional characteristics with therapeutic failure in patients with femoroacetabular impingement, who underwent hip arthroscopy.
  
  
  METHODS
  A cohort study was performed on 179 patients with femoroacetabular impingement who underwent hip arthroscopy between 2004 and 2012. The demographic, anatomical, functional, and clinical information were recorded. A logistic regression model and ANCOVA were used in order to compare the described characteristics with the treatment outcomes of the hip arthroscopy.
  
  
  RESULTS
  The median time of follow-up for symptoms was 13 months (8-30), and the mean time of follow-up after surgery was 23.83 ± 9.8 months. At the end of the follow-up 3.91% of the patients were considered as a therapeutic failure. The WOMAC score in pain and functional branches, as well as the total WOMAC score, showed significant differences (P<.05). The mean WOMAC score was higher (0 to 100 with 0 being a perfect score) in the group of patients who failed after surgery as compared with the group who meet the requirements for a successful treatment, 65.9 vs 48.8, respectively (mean difference 17.0; 95% CI; 1.3-32.6; P=.033).
  
  
  CONCLUSIONS
  The poor functional state prior to arthroscopic treatment of femoroacetabular impingement, mainly due to preoperative pain, assessed using the WOMAC scale, is associated with a higher therapeutic failure rate.
authors.affiliation: Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia. Electronic address: damian.martinez.soto@hotmail.com.
authors.forename: D
authors.initials: D
authors.lastname: Martínez
authors.affiliation: Hip Preservation Center, Baylor University Medical Center, Dallas, Texas, Estados Unidos; Grupo de investigación GRINMADE, Universidad de Antioquia, Medellín, Colombia.
authors.forename: J
authors.initials: J
authors.lastname: Gómez-Hoyos
authors.affiliation: Unidad de Ortopedia, Clínica Las Américas, Medellín, Colombia; Grupo de investigación GRINMADE, Universidad de Antioquia, Medellín, Colombia.
authors.forename: W
authors.initials: W
authors.lastname: Márquez
authors.affiliation: Posgrado de Medicina Deportiva, Universidad de Antioquia, Medellín, Colombia; Grupo de investigación GRINMADE, Universidad de Antioquia, Medellín, Colombia.
authors.forename: J
authors.initials: J
authors.lastname: Gallo
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001182:Arthroscopy; D005260:Female; D057925:Femoracetabular Impingement / Q000601:surgery*; D005500:Follow-Up Studies; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D016896:Treatment Outcome; D055815:Young Adult
keywords: Artroscopia de cadera; Choque femoroacetabular; Factores de riesgo; Femoroacetabular impingement; Fracaso del tratamiento; Hip arthroscopy; Osteoarthritis; Osteoartrosis; Risk factors; Therapeutic failure