Knee Surgeon Mumbai, Hip Surgeon Mumbai, Top Orthopedic Surgeon Mumbai, Best Orthopedic Doctor Mumbai, CAS Surgeon Mumbai, Osteoarthritis Surgeon Mumbai, Knee Surgeon India, Hip Surgeon India, Best Orthopedic Doctor India, Top Orthopedic Surgeon India, Joint Surgery Mumbai, Joint Surgery India, Knee Surgery Mumbai, Knee Surgery India, Orthopaedic Surgeon Mumbai, Orthopaedic Surgeon India, Osteoarthritis Surgery India, CAS Surgeon India.

NEWER TRENDS - ROTATING PLATFORM KNEES

Rotating Platform

Knee joint implants work as a system and consist of femoral, tibial and patellar components. The femoral component is the upper most part of a knee system and is made of a strong polished metal. It covers the end of the thighbone, the femur, as it enters the knee joint.

The patellar component replaces the kneecap in the center of the knee.

The tibial component of the prosthesis covers the top end of the shinbone, (tibia); as it comes into the knee. In a rotating platform knee, the tibia is covered with a metal tray. The tibial component is topped with a disk-shaped polyethylene insert. The polyethylene insert sits on a highly polished surface and rotates around a conical post.

The insert lies at the point where the femoral and tibial components meet. This subjects the polyethylene to forces generated by the bending and rotation of the knee during activity. Even though the physical and mechanical properties of polyethylene are well suited to this job, wear of the insert can happen.

Studies have found that in many cases, wearing of the polyethylene in the knee component can cause tiny particles of the material to be grated off and lead to an early failure of the system. The rotating platform implants, such as DePuy's LCS® Complete Total Knee System and p.f.c.® Sigma TM RP Rotating Platform Knee System, are designed to reduce the stresses in the knee which can lead to polyethylene wear and may increase the longevity of the implant.

For more information about:

p.f.c. Sigma RP Rotating Platform Knee System, click here.

LCS Complete Total Knee System, click here.

The Differences

The difference between a rotating platform knee implant and the more traditional fixed bearing implant is mainly in the design of the tibial component. In a fixed knee prosthesis the tibial component is topped with a flat metal piece that securely holds the polyethylene insert. When the knee is in motion, the femoral component glides across the polyethylene. Since the natural shape of the end of the femur, the condyle, is not perfectly rounded, differing amounts of stress are put on the insert at different points in the movement of the knee. In the rotating platform knee prosthesis, the polyethylene insert can rotate slightly, which gives the knee implant a more natural interface between the surface of the femoral component and the polyethylene. Since the polyethylene can rotate with the femoral component, the contact between the two components can be made more even, which can lessen the stress and wear the implant may experience.

Advantages

Because many of the components of the rotating platform knee are the same as the traditional fixed knee implants, the same proven surgical procedures can be used for implanting the device. The currently used preoperative and postoperative routines for the patient are also the same.

The majority of total knees implanted are fixed bearing knees. Therefore, more clinical data exists to support them. However, the LCS Complete Total Knee from DePuy has a clinical history of over 20 years in the United States . Additionally, studies from Europe , where rotating platform knees have been more widely accepted than in the United States , have indicated performance comparable to the fixed knee systems.

Any major surgery has a potential for risk; TKA is no exception. It is important that you review these risks with your physician prior to undergoing any surgical procedure.

Reciprocal Links

Ambest Link