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Poster: 70Outcome of Ceramic-Ceramic Total Hip Arthroplasty in Patients YoungerThan 50 YearsAndrew Murphy - ctr for computer assisted and reconstructive surgery - boston, usaSimon Steppacher - New England Baptist Hospital - Boston, USAMoritz Tannast - ctr for computer assisted and reconstructive surgery - boston, usa*Stephen Murphy - New England Baptist Hospital - Boston, USA*Email: stephenbmurphymd@gmail.comOutcome Of Ceramic-Ceramic Total Hip ArthroplastyIn Patients Younger Than 50 YearsAndrew C. Murphy 1 , Simon D. Steppacher MD 2 , Moritz Tannast MD 2 , Stephen B. MurphyMD 11 Center for Computer Assisted and Reconstructive Surgery, New England Baptist Hospital,Boston, University of Bern, Bern Switzerland 2Introduction: Historically, patients who are less than 50 years old at the time of total hiparthroplasty (THA) have had higher failure rates than older patients. The current investigationprospectively assessed the survivorship and clinical results of alumina ceramic-ceramic THA inpatients younger than 50 years.Methods: 267 consecutive hips in 228 patients with a mean age at operation of 41 years (range18 ​50 years) underwent alumina ceramic-ceramic THA. The preoperative Merle d​Aubigné score was 11.1 ± 1.6 (6 ​15). The preoperative diagnosis included primaryosteoarthritis or impingement (128 hips, 48%), developmental dysplasia of the hip (85 hips,32%), osteonecrosis of the femoral head (19 hips, 7%), posttraumatic osteoarthrosis (19 hips,7%), and others (16 hip, 6%). The mean cup diameter was 51.8 ± 3.7 (range, 46 ​60 mm). 73(31%) bearings were 28 mm and 165 (69%) bearings were 32 mm.(31%) bearings were 28 mm and 165 (69%) bearings were 32 mm.Results: At mean follow-up of 6.1 years (range 2 ​12 years), the mean Merle d​Aubignéscore was 17.4 ± 0.9 (14 ​18). There were no radiographic signs of osteolysis. There were 5revisions for implant-related complications (0.2%): 1 acetabular liner fracture, 1 femoral headfracture (poly-trauma), 2 failures of osseointegration (1 stem and 1 cup) and 1 cupdislodgement. The 10-year Kaplan Meier survivorship is 97.6% (95% confidence interval 95.4-99.8%). There were no hip dislocations.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]