Die Daten der hier verwendete Prothesenform lässt beide Schaft-Designs sinnvoll erscheinen. Im Vergleich mit der Literatur für zementfreie Hüftgelenksendoprothesen kam jedoch kein eindeuticher Vorteil für die Kombination aus minimalinvasiver Zugang,Hydroxylapatit-Beschichtung und optimierten Schaftvolumen dargestellt werden. Die untersuchten zementfreien Hüftgelenkstotalendoprothesen fixieren im Gegesatz zur Theorie nicht proximal metaphysär sondern epiphysär. Die Knochendichtemessung eignet sich im Beobachtungszeitraum nicht, Qualitäts-Unterschiede verschiedener Prothesendesigns aufzudecken.     «

Die Daten der hier verwendete Prothesenform lässt beide Schaft-Designs sinnvoll erscheinen. Im Vergleich mit der Literatur für zementfreie Hüftgelenksendoprothesen kam jedoch kein eindeuticher Vorteil für die Kombination aus minimalinvasiver Zugang,Hydroxylapatit-Beschichtung und optimierten Schaftvolumen dargestellt werden. Die untersuchten zementfreien Hüftgelenkstotalendoprothesen fixieren im Gegesatz zur Theorie nicht proximal metaphysär sondern epiphysär. Die Knochendichtemessung eignet sic...     »

Introduction This prospective 12 months dual energy X-ray absorptiometry (DEXA) study evaluated differences in periprosthetic bone mineral density in 40 patients undergoing cementless total hip arthroplasty (THA) by a minimally invasive anterior approach (AMIS), using Medacta AMIStem or Quadra stems. Both stems are straight rectangular: AMIStem shows a reduced lateral flare and length in comparison to Quadra. Objectives The main goal of the study is to verify if the bone mineral density is equivalent with the AMIStem and Quadra femoral component. Methods Forty (40) patients were allocated randomly to the Quadra and AMISstem groups Three patients were lost to follow-up and revision surgery was performed on one patient due to periprosthetic fracture after a car accident. Patients were examined clinically and underwent DEXA preoperatively and at one week, six weeks, six months and one year after THA. Patients enrolled had one lower limb arthroplasty and no osteoporosis. Results The Harris Hip Score increased significantly for Quadra stem 51,3±14,1 and AMIStem 41,0±13,4. The High Activity Hip Score increased significantly for Quadra stem 3,8±2,2 and AMIStem 4,1±2,4. Considering 0,15 mg/cm2 as acceptable treatment difference, bone mineral density for AMIStem and Quadra groups was statistically equivalent. A limited remodeling process with slight bone loss in the proximal calcar region R7, as expected after implantation of uncemented components, was observed for both stems. Conclusions The study demonstrates that the two stems are statistically equivalent in all zones at any time-point.      «

Introduction This prospective 12 months dual energy X-ray absorptiometry (DEXA) study evaluated differences in periprosthetic bone mineral density in 40 patients undergoing cementless total hip arthroplasty (THA) by a minimally invasive anterior approach (AMIS), using Medacta AMIStem or Quadra stems. Both stems are straight rectangular: AMIStem shows a reduced lateral flare and length in comparison to Quadra. Objectives The main goal of the study is to verify if the bone mineral density is eq...     »