title: Poorer Arthroscopic Outcomes of Mild Dysplasia With Cam Femoroacetabular Impingement Versus Mixed Femoroacetabular Impingement in Absence of Capsular Repair.
abstract: OBJECTIVE
  To compare outcomes of mild dysplasia with cam femoroacetabular impingement (FAI) vs mixed FAI with hip arthroscopy without capsular repair.
  
  
  METHODS
  A retrospective review of a 2009 to 2010 multicenter prospective outcome study was performed comparing a cohort with mild dysplasia and cam femoroacetabular impingement (cohort D) to a cohort with mixed FAI (cohort M). Outcome measures included Nonarthritic Hip Score (NAHS) and satisfaction with minimum 2-year follow-up.
  
  
  RESULTS
  Of 150 patients/159 hips enrolled in the initial prospective outcome study, 10 patients/10 hips had acetabular dysplasia and 8 patients met the inclusion criteria. Cohort D had 8 patients (5 female) of mean age 49.6 years with mean lateral center-edge angle (LCEA) of 19° (range, 16°-24°) demonstrating a mean change in NAHS of +20.00 at 3 months (P = .25), +14.33 at 12 months (P = .03), and -0.75 at 24 months (P = .74). Mean satisfaction was 2.88 out of 5. Cohort M had 69 patients (32 female) of mean age 38.6 years with a mean LCEA of 33° (range, 25°-38°) demonstrating a mean change in NAHS of +12.09 at 3 months (P < .0001), +20.39 at 12 months (P < .0001), and +21.99 at 24 months (P < .0001). Mean satisfaction was 3.58 out of 5. Cohort D demonstrated significantly less improvement in NAHS (P = .002) and a difference of -31.06 points compared to cohort M at minimum 2-year follow-up. Dysplasia was the only statistically significant predictor of poorer outcomes.
  
  
  CONCLUSIONS
  The common combination of mild dysplasia and cam FAI has poorer outcomes than mixed FAI following arthroscopic surgery without capsular repair.
authors.affiliation: Department of Orthopedics, DISC Sports and Spine Center, Marina del Rey, CA. dmatsuda@discmdgroup.com.
authors.forename: Dean K
authors.initials: DK
authors.lastname: Matsuda
authors.forename: Nikhil
authors.initials: N
authors.lastname: Gupta
authors.forename: Monti
authors.initials: M
authors.lastname: Khatod
authors.forename: Nicole A
authors.initials: NA
authors.lastname: Matsuda
authors.forename: Faith
authors.initials: F
authors.lastname: Anthony
authors.forename: Joshua
authors.initials: J
authors.lastname: Sampson
authors.forename: Raoul
authors.initials: R
authors.lastname: Burchette
mesh_terms: D000328:Adult; D005260:Female; D057925:Femoracetabular Impingement / Q000150:complications / Q000601:surgery*; D006617:Hip Dislocation / Q000150:complications / Q000601:surgery*; D006621:Hip Joint / Q000601:surgery*; D006801:Humans; D017746:Joint Capsule / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D017060:Patient Satisfaction; D011446:Prospective Studies; D012189:Retrospective Studies; D016896:Treatment Outcome