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We treated 50 hips in 50 patients (9 male and 41 females) with cementless total hiparthroplasty(THA) in our hospital. 42 osteoarthritis hips, 4 rheumatoid arthritis hips and 4idiopathic osteonecrosis hips were included. All patients were performed THA withVectorVision Hip 2.5.1 navigation system (BrainLAB). We used AMS HA cups and PerFixstems (Japan Medical Materials, Osaka). The mean age of surgery was 63 years (43-81 years).The pelvic inclination angles were measured with anteroposterior radiography 2 months and 1year after surgery obey the Doiguchi method.ResultsAccording to preoperative planning, the average pelvic inclination angle was 1.2 degreesanteversion (15.3 degrees anteversion to 25.6 degrees retroversion). The amount of changebetween supine and standing position was 3.8 degrees prior to surgery, 1.0 degree at 2 monthsafter surgery and 1.3 degrees at 1 year after surgery. 8 patients prior to surgery, 1 patient at 2months after surgery and 1patient at 1 year after surgery changed more than 10 degrees betweensupine and standing position. The pelvic inclination angle of 9 patients prior to surgery, 22patients at 2 months after surgery, 24 patients at 1 year after surgery changed in the anteverteddirection with posture, it tended to increase after surgery.ConclusionsWhen we place the acetabular component, it is important that the pelvic inclination angle insupine position according to preoperative planning and the change of pelvic inclination anglewith posture. The amount of change of pelvic inclination angle tended to decrease at 1 yearafter surgery compared to 2 months after surgery. However, we experienced some patients theamount of change of pelvic inclination angle between supine and standing position changedmore than 10 degrees. When the pelvic inclination angle changes widely, it requires moreattention because of a narrow safe margin for placing the acetabular component.Poster: 75Influence of Impaction Forces of Ceramic Ball Heads on Proper Seating onMetal Stems for Hip ImplantsINTRODUCTION:*Thomas Pandorf - CeramTec AG - Plochingen, GermanyRoman Preuss - CeramTec AG - Plochingen, Germany*Email: t.pandorf@ceramtec.decThe advantage of a modular system is that the surgeon is able to choose the stem and a ballhead of appropriate sizes from a series of components and assembly them by using astandardized connection. Herewith, the implant can be adapted to the individual patient. In thepreoperative planning the appropriate combination is chosen but also during the surgery it ispossible to select the ideal combination. Beside the benefit of a modular connection,file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]