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Thursday, October 7, 2010, 14:00-14:40Session A5: Hip MechanicsOutcome of Ceramic-Ceramic Total Hip Arthroplasty in Patients WithDevelopmental Dysplasia of the HipSimon 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 Arthroplasty In Patients With DevelopmentalDysplasia Of The Hip S.D. Steppacher, M. Tannast, S.B. Murphy New England BaptistHospital, 125 Parker Hill Avenue, 02120 Boston, USATotal hip arthroplasty (THA) in patients with developmental dysplasia of the hip (DDH) hasbeen associated with increased rates of complications and revision. Hip instability and wearinducedosteolysis are among the more common and serious of these problems. The currentinvestigation prospectively assessed the survivorship and clinical results of patients with DDHtreated by alumina ceramic-ceramic THA.We investigated 161 consecutive hips in 145 patients with DDH classified as Crowe type I (131hips, 81%), II (26 hips, 16%), III (2 hips, 1%), and IV (2 hips, 1%). All patients had anuncemented titanium acetabular component with a flush mounted alumina ceramic-ceramicbearing. The mean age at operation was 48.0 ± 12.2 years (range, 18 – 79 years). Thepreoperative Merle d’Aubigné score was 11.4 ± 1.7 (6 – 15). 27 hips (17%) had at least oneprevious surgical procedure. 92 hips (57%) were replaced with the use of surgical navigation foracetabular component positioning. The mean cup diameter was 49.9 ± 3.4 mm (46 – 60 mm). 88(55%) bearings were 28mm and 73 (45%) bearings were 32mm.At a mean follow-up of 6.1 ± 2.5 years (2 – 11.3 years), the mean Merle d’Aubigné score was17.4 ± 0.9 (14 – 18). There were no cases of osteolysis or dislocation. There was onereoperation of an early displaced cup. In addition, there was one calcar crack that wascerclaged, one intraoperative trochanteric fracture also repaired at surgery. No patientcomplained of squeaking. 94 patients with 100 hips (61%) completed a questionnairespecifically asking for squeaking. None of these patients reported squeaking. The 10-yearKaplan Meier survivorship of the implants (revision of any component for any reason) was99.4% (95% confidence interval 98.2-100%).Results of ceramic-ceramic THA in young patients with low to middle graded DDH after two toeleven years follow-up are promising with no radiographic signs of osteolysis or dislocation.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]