Retrospective non-randomized in-vivo comparison of different levels of femoral rollback in the ATTUNE total knee arthroplasiy system (rotating platform CR high level roll back vs. rotating platform CR low level roll back) on the basis of fluoroscopic and marker-based motion capture evaluation. How do different levels of intra-operatively observed femoral rollback correlate to postoperative kinematics under weight bearing conditions? Does the modified design of the Attune Knee System influence the extent of the femoral rollback compared to the PFC Sigma Knee System? Does the femoral rollback maintain over a period of 12 months follow up or is it reduced by, for example, remodelling of the posterior cruciate ligament?
Name: ATTUNE® Knee System
Name: PFC® SIGMA® Knee System
Description: We intend to collect tibio-femoral anterior-posterior translation during active movement in order to analyse the different extent of femoral rollback (fluoroscopy and gait analysis including lunge activity) at 12 months post operative. Therefore, the femoral rollback will be classified to high level (l) and low level (ll) according to intraoperatively documented findings and postoperative radiographs.
Measure: tibio-femoral anterior-posterior translation Time: at 12 months post operativeDescription: We intend to collect the following secondary objective data pre operatively and '12 months post operative: - PKIP
Measure: quality of life Time: at 12 months post operativeDescription: We intend to collect the following secondary objective data pre operatively and '12 months post operative: - KOOS
Measure: quality of life Time: at 12 months post operativeDescription: We intend to collect the following secondary objective data pre operatively and '12 months post operative: - WOMAC
Measure: quality of life Time: at 12 months post operativeDescription: We intend to collect the following secondary objective data pre operatively and '12 months post operative: - SF 36
Measure: quality of life Time: at 12 months post operativeParallel Assignment
There is one SNP
Here, we use an infra-red optical motion capture system (10 T20S cameras, Vicon, Oxford, UK; system accuracy \-0.3-0.5 mm), tracked at120Hz, as well as 2 force plates (AMTI 0R6, Watertown, MA, USA) in order to assess the external forces while performing active movements. --- T20S ---