Convened under the auspicious of esteemed endorsers - ISTA

After thirty-eight months in vivo, the patient underwent her second revision hip arthroplasty.Although thorough irrigation had been carried out at the time of the first revision arthroplastywith six litres of saline solution through a pulse irrigator, ceramic particles which remained inthe periprosthetic tissues later migrated to the articulating surfaces, thus producing third-bodywear. The ceramic particles caused severe third-body abrasive wear on the CoCr alloy femoralhead which was no longer of spherical shape. Approximately 9% (14.3g) mass was lost fromthe CoCr femoral head due to the articulation against the ceramic particles which wereembedded into the XPE acetabular liner causing grooving wear. This large amount of massremoved caused symptomatic metallosis in the patient. The XPE acetabular liner did showobvious wear and its rim had fractured in vivo.In vivo fracture of a ceramic-on-ceramic total hip replacement has shown to create highlyabrasive third-body wear particles that can not be removed completely by irrigation duringrevision surgery. Some ceramic particles remained within the periprosthetic tissue and haveshown to migrate to the articulating surfaces and became embedded in the XPE acetabular liner.The embedded ceramic particles were approximately 6-times higher in hardness than the CoCralloy of the femoral head and thus, accelerated third-body abrasive wear. Consequently, thepatient underwent a second revision hip arthroplasty after thirty-eight months. The patientreceived a second ceramic-on-ceramic total hip replacement (Biolox, Ceramtec AG,Plochingen, Germany; Trident, Stryker Inc. Mahwah, NJ) and has been doing well after herlatest follow-up-up at twenty-four months. To avoid excessive third-body wear of the crosslinkedPE, the CoCr femoral head and thus metallosis, fractured ceramic-on-ceramic hipreplacement should only be revised with a new ceramic-on-ceramic articulation.Poster: 74Anteversion Angle of THA With Navigation System Based on the TimeCourse of the Pelvic InclinationObjectives*Shuhei Osaki - Okayama University Hospital - Okayama, JAPANKazuo Fujiwara - Okayama University Hospital - Okayama, JapanHirosuke Endo - Okayama University Graduate School of Medicine, Dentistry, andPharmaceutical Sciences - Okayama-city, JapanYoshiaki Miyake - Okayama University - Okayama, JapanToshifumi Ozaki - Okayama University Hospital - Okayama, JapanShigeru Mitani - Kawasaki Medical School - Kurashiki-city, Japan*Email: ozaking11@hotmail.comIt is difficult to evaluate the optimal angle of the cup in total hip arthroplasty. Especially theinclination of pelvis changes with posture and time course. We place the componentconsidering with the change of inclination of pelvis with its posture by CT-based navigationsystem. We analyze the perioperative pelvic inclination angles with posture change.Materials and Methodsfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]