Discussion and Conclusions Introduc0on Results It is unknown if morphological abnormali5es of the hip are compa5ble with lifelong hip func5on and avoidance of osteoarthri5s (OA). Our purpose was to inves5gate the prevalence of radiographic findings consistent with developmental dysplasia of the hip (DDH) and femoroacetabular impingement (FAI) in senior athletes with wellfunc5oning hips. Pa0ents and Methods The Prevalence of Hip Morphologic Abnormali0es in a Highly Ac0ve Senior Popula0on University of Utah Orthopaedics, Salt Lake City, Utah Lucas Anderson MD, Ashley Kapron Phd, Stephen Aoki MD, Jesse Chrastil MD, Mike B. Anderson MS ATC, Ray Grijalva MD, Jill Erickson PAC, Christopher L. Peters MD Disclosures are listed in the AAOS program and website. There are no conflicts with this topic. Overall Hip Morphology Pa5ents with OA were more likely to have radiographic features of FAI • OR 3.7, 95% CI 1.6 – 8.8, p=0.003 Male pa5ents were more likely to have radiographic features of FAI • OR 10.7, 95% CI 5.4 – 21.1, p<0.001 Breakdown of OA by hip morphology Breakdown of subjects with FAI DDH Lateral Center Edge Angle (LCEA) < 20° Cam FAI Alpha angle (AA) ≥50° on Frog Leg Lateral or AP views Pincer FAI LCEA > 39°, Acetabular Index (AI) < 0° and/or crossover sign present OA Tönnis Grade 2 or 3 • 55% Male, Mean Age 67 yrs (5091 yrs) • 93% Caucasian • 5 hips excluded (prior THA or Fx) 1087 Na5ve Hip Xrays were reviewed from 546 Senior Athletes at the Huntsman World Senior Games (St. George, Utah) Radiographic Measures and Associated Cutoffs to Determine Prevalence of Hip Pathomorphology Morphologic abnormali5es (91%), par5cularly FAI (82%), were more prevalent than an5cipated in these senior athletes. Rate of radiographic osteoarthri5s was rela5vely low (16%) but strongly correlated with FAI. While radiographic prevalence of FAI is high (82%) only 20% of FAI hips showed signs of Tönnis grade 2 or 3. While FAI and dysplasia have historically been associated with development of early OA, this study suggests that there may be other factors, such as gene5cs and car5lage type, which may play a joint preserving role despite presence of pathomorphology in this series of high func5oning senior athletes. 91% of hips had radiographic features of pathomorphology Histogram shows different historical cutoffs yield varied prevalences of cam FAI.