Hip resurfacing has become highly concentrate dto a very small number of centers and surgeons(Figure 16). Only 63 hospitals submitted resurfacing procedures. Three of those hospitals (Hospital A, B,and C) accounted for n=443 (42.7%) of all resurfacing procedures. There were three surgeons who performed most or all of these resurfacing procedures (data not shown).  One surgeon each at Hospitals A and B performed 100% of the resurfacing procedures and another surgeon performed 90% of procedures at Hospital C. Furthermore, Figure 17 shows that the majority (82.2%) of hip resurfacing procedures were conducted on male.