#Kinematics input to postview software

The cohort will also be compared with data of normal knee kinematics, as reported in current literature.Īt 6 months follow-up, dynamic fluoroscopy will be used to analyze implant kinematics (i.e. The objective of the present study is to determine the contact areas and their movement through a 0-140° arc of motion in both the anteroposterior (AP) and ML directions. In the present study, the investigators will use a postoperative bi-planar imaging method in weight-bearing motor tasks with active muscle contraction, to determine the in vivo contact areas on the tibial articulating surface of a PS TKA during flexion of the knee.

#Kinematics input to postview software

This implant has been claimed to reduce midflexion instability and improve joint kinematics, because of a particular multiradius shape of the condylar surface.įor intra-operative kinematic acquisition, a commercial navigation system (BLUIGS, Orthokey Italia srl, Firenze, Italy) with a dedicated software for kinematic tests will be used. Recently an improved implant design of fixed bearing PS DePuy implant has been anticipated to early users. The mid-flexion instability may be the cause of joint instability, paradoxical femoral rollback, surgical variation. Implant design can influence final kinematic results. One of the most debated topics in TKA is the effectiveness of the prosthesis to reproduce physiological kinematics at the replaced knee, usually expressed in terms of patterns of joint rotation in the three anatomical planes, of the functional axis, and of the tibio-femoral contact points on the medial and lateral condyles, that is, femoral roll-back. Kinematic tests will be performed to analyze femoral rotation patterns and translation patterns of the medial and femoral condyle respect to the tibial plateau during different daily life motor tasks.ĭespite reportedly good implant survival rates, not all patients are fully satisfied after total knee arthroplasty (TKA). A prospective study will be performed on a new implant: the DePuy ATTUNETM fixed-bearing (FB) posterior-stabilized (PS) knee prosthesis. Data will be collected during the surgery with a Computer Assisted Surgery system and in the post operative follow up phase using the dynamic RSA focusing.

The main goal of this study is to investigate the effect of a new implant design on the postoperative active knee kinematics on mid-flexion instability of the joint. Condition or diseaseĭevice: Primary Total Knee Arthroplasty (ATTUNE Knee System) A prospective randomized study will be performed on a new implant: the DePuy ATTUNETM fixed-bearing (FB) posterior-stabilized (PS) knee prosthesis. The purpose of this study is to investigate the effect of a new implant design on the post-operative active knee kinematics, focusing on mid-flexion instability of the joint. Our dynamic RSA technique allows producing real time x-ray video of TKA in weight-bearing (WB) conditions with active muscle contraction. However these are often static, because of even most advanced x-ray film exchanger limit the number of pictures taken to less than 10 per second. In vivo the gold standard for obtaining reliable 3D measurements is RSA. Furthermore, it has been reported that up to 25% of patients are not satisfied with the functional results of their TKA. As the number of younger patients is increasing, there has been a shift in focus in total Knee Replacement (TKR) outcome, with post-operative function and implant longevity being the important issues for quality of patient care. However, for patients younger than 60 years, approximately one out of 10 will require revision total knee arthroplasty within 10 years of surgery. Statistics indicate that for patients over 60 year old approximately one out of 20 will require corrective reoperations within 10 years after surgery.

Why Should I Register and Submit Results?īackground: Across the European Union there are 535,000 Total Knee Arthroplasty (TKA)per year.