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Poster: 35Patellar Clunk Syndrome in Mobile-Bearing Total Knee Arthroplasty*Yasuo Higuma - Shinbeppu Hospital - Beppu, JapanKazuhide Tomari - Shinbeppu Hspital - Beppu, JapanMakoto Kondo - Shinbeppu-Hspital - Beppu, JapanTakahiro Noguchi - Shinbeppu Hospital - Beppu, Japan*Email: Higuma@shinbeppu-hosp.jpThe patellar clunk syndrome is one of the complications of posterior stabilized total kneearthroplasty and is related to the intercondylar box of the femoral component. The etiology ofthis syndrome is multifactorial. We investigated the incidence of patellar clunk syndrome aftermobile-bearing posterior stabilized total knee arthroplasty and considered the causative factorsof this syndrome.A total of 243 patients (192 women, 51 men; average age, 74.1 years) in whom 330 consecutivemobile-bearing total knee arthroplasties were performed using Vanguard RP (Biomet, Warsaw,IN) were examined after the operation to check for the presence of patellar clunk during kneeextension. The patella had been resurfaced in 252 knees and not resurfaced in 78 knees.Radiographic analysis was performed in patients with patellar clunk.Six knees were diagnosed with patellar clunk syndrome (incidence, 1.8%). The patella had beenresurfaced in all of these patients. The mean period of onset of symptoms was 4.5 months(range, 3 to 6 months), and the mean postoperative flexion angle was 120.8 degrees (range, 110to 125 degrees). No specific joint line changes were observed, and the patellar height was withinnormal range. The mean tilting angle of the patella in patients with patellar clunk was 0.3degrees (range, -3 to 2 degrees).Vanguard RP allows hyperextension of 12 degrees and prevents post from impinging againstanterior margin of intercondylar box. However, the position of the box seemed to be one of thefactors affecting the patellar clunk syndrome. Further, an excellent range of motion is anotherimportant factor.Poster: 36Effect of M/L Taper Kinectiv Stem to Reduce Impingement With DDHPatients During Primary Total Hip ArthroplastyPurpose:*Kazuo Hirakawa - Shonan Kamakura Joint Reconstruction Center - Kamakura, JapanKoji Tsuji - Shonan Kmakura Joint Reconstruction Center - Kamakura, JAPAN*Email: Osteolysis@aol.comNeck and cup impingement resulted in producing larger amount of wear debris and risk forfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]