title: Arthroscopic treatment of global pincer-type femoroacetabular impingement.
abstract: OBJECTIVE
  Few studies have evaluated the role of hip arthroscopy in patients with coxa profunda. The purposes of this study are to (1) report functional hip outcomes after arthroscopic treatment of patients with femoroacetabular impingement (FAI) associated with radiographic coxa profunda and (2) evaluate factors associated with poor hip function at minimum 2 years following surgery in this specific cohort.
  
  
  METHODS
  This retrospective review included patients with radiographic sign of coxa profunda who underwent hip arthroscopy to treat FAI. Preoperative and post-operative radiographs were reviewed to determine changes in lateral centre-edge angle (CEA), the presence and correction of Cam deformity, and Tönnis grade of osteoarthritis. Hip functional scores, including modified Harris Hip Score, Hip Outcome Score, and IHOT score, were obtained at a minimum of 2 years following surgery.
  
  
  RESULTS
  The study cohort included 46 patients with a mean preoperative CEA of 39.9 (±2.4)° which decreased to a mean of 30.8 (±1.8)° post-operatively. At a mean follow-up of 2.5 years (±0.5), the mean mHHS and IHOT scores were 79.5 (±20.2) and of 69.7 (±28.3), respectively. Increased preoperative (p = 0.02) and post-operative (p = 0.001) Tönnis Osteoarthritis Grade was associated with a lower mHHS.
  
  
  CONCLUSIONS
  Patients with coxa profunda can achieve similar functional scores to more traditional FAI cohorts after arthroscopic treatment. Baseline osteoarthritis is predictive of lower hip function after hip arthroscopy. This study demonstrates that patients with global over-coverage can benefit from hip arthroscopy and may influence surgeons to treat these patients with less invasive arthroscopic techniques which avoid the morbidity of open surgical procedures.
  
  
  METHODS
  Retrospective case series, Level IV.
authors: Departments of Orthopedic Surgery and Sports Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA.
authors: Thomas L
authors: http://orcid.org/0000-0001-7741-9692
authors: TL
authors: Sanders
authors: Departments of Orthopedic Surgery and Sports Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA.
authors: Patrick
authors: P
authors: Reardon
authors: Departments of Orthopedic Surgery and Sports Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA.
authors: Bruce A
authors: BA
authors: Levy
authors: Departments of Orthopedic Surgery and Sports Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA. krych.aaron@mayo.edu.
authors: Aaron J
authors: AJ
authors: Krych
mesh_terms: D000328:Adult; D001182:Arthroscopy / Q000379:methods; D015331:Cohort Studies; D005260:Female; D057925:Femoracetabular Impingement / Q000000981:diagnostic imaging / Q000601:surgery*; D006617:Hip Dislocation / Q000000981:diagnostic imaging / Q000601:surgery*; D006621:Hip Joint / Q000601:surgery*; D006801:Humans; D008297:Male; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D016896:Treatment Outcome
keywords: Center edge angle; Coxa profunda; Femoroacetabular impingement; Pincer