title: Midterm outcomes in patients with cam femoroacetabular impingement treated arthroscopically.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the midterm outcomes of patients with cam-type femoroacetabular impingement treated arthroscopically.
  
  
  METHODS
  Outcomes were measured with the Nonarthritic Hip Score (NAHS), visual analog scale pain scores, and satisfaction levels preoperatively; at 6 weeks and 3, 6, 12, and 24 months postoperatively; and at final follow-up. Two hundred one procedures were available for final assessment with a minimum follow-up of 36 months (mean, 46 months). Ninety-nine percent of hips had a preoperative Tönnis grade of 1 or less.
  
  
  RESULTS
  The NAHS significantly improved from a mean of 56.1 to 78.2 (P < .001). Visual analog scale pain scores improved from a mean of 6.8 to 2.7 (P < .001). Preoperative to postoperative satisfaction levels improved from 0.5% to 75% of procedures. Twelve patients required hip arthroplasty during the follow-up period and had a higher incidence of grade 4 acetabular chondral defects versus those without arthroplasty (P < .03). Patients with pincer resections had significantly poorer results versus the remainder of the cohort (P < .01).
  
  
  CONCLUSIONS
  We have shown satisfactory results using a validated hip scoring system, showing improvement in NAHS, pain scores, and satisfaction levels in a large cohort of patients with cam-type femoroacetabular impingement followed up for a mean of 46 months. The results have shown improvement and stability throughout a range of 36 to 70 months' follow-up. There was no difference in preoperative to postoperative NAHS between age groups. There was a larger percentage of grade 4 acetabular chondral defects in those patients who needed conversion to hip arthroplasty. Patients with associated pincer pathology had poorer results after acetabular rim resection.
  
  
  METHODS
  Level IV, therapeutic case series.
authors.affiliation: St. Croix Orthopaedics, PA, Stillwater, Minnesota, USA. palme024@aol.com
authors.forename: David H
authors.initials: DH
authors.lastname: Palmer
authors.forename: Vishal
authors.initials: V
authors.lastname: Ganesh
authors.forename: Thomas
authors.initials: T
authors.lastname: Comfort
authors.forename: Penny
authors.initials: P
authors.lastname: Tatman
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D001182:Arthroscopy / Q000379:methods*; D005260:Female; D057925:Femoracetabular Impingement / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D005500:Follow-Up Studies; D006621:Hip Joint / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D017060:Patient Satisfaction / Q000706:statistics & numerical data*; D016059:Range of Motion, Articular; D017678:Sex Distribution; D016896:Treatment Outcome; D055815:Young Adult