Comparison of Pivotal Medial Polyethylene Versus Ultra-congruent in Total Knee Arthroplasty

Total knee arthroplasty is usually effective at improving the quality of life of patients suffering from arthritis.

Over the years, patient expectations about the quality of life post-implantation continue to rise.

It is therefore essential to improve continuously surgical techniques and implants to fulfill patient expectations in terms of pain and movements.

The prosthetic device is composed of a metallic femoral unit, which imitates the articular surface of the femur, and a metallic tibial baseplate covered with a polyethylene (a highly resistant polymer) insert which articulates between the femur and the tibia. This insert can take several forms such as medial pivot or ultra-congruent.

This polymer provides an interface between the two metallic units forming the prothetic device. It has two roles: it provides a lasting contact surface and it offers stability to the knee in substitution of the ligaments.

In order to achieve this double function, a polyethylene system, called " medial pivot " was conceived.

This system mimics as close as possible the anatomical knee kinematics with a rotational movement that the " ball in socket " tries to reproduce by the mediatisation of the pivot point during knee flexion.

Currently, there are no randomized study which were conducted comparing these two types of polyethylene.

Total knee arthroplasty is usually effective at improving the quality of life of patients suffering from arthritis.

Over the years, patient expectations about the quality of life post-implantation continue to rise.

It is therefore essential to improve continuously surgical techniques and implants to fulfill patient expectations in terms of pain and movements.

The prosthetic device is composed of a metallic femoral unit, which imitates the articular surface of the femur, and a metallic tibial baseplate covered with a polyethylene (a highly resistant polymer) insert which articulates between the femur and the tibia. This insert can take several forms such as medial pivot or ultra-congruent.

This polymer provides an interface between the two metallic units forming the prothetic device. It has two roles: it provides a lasting contact surface and it offers stability to the knee in substitution of the ligaments.

In order to achieve this double function, a polyethylene system, called " medial pivot " was conceived.

This system mimics as close as possible the anatomical knee kinematics with a rotational movement that the " ball in socket " tries to reproduce by the mediatisation of the pivot point during knee flexion.

Currently, there are no randomized study which were conducted comparing these two types of polyethylene.

• knee joint mobility [Срок оценки: Day -1]
• knee joint mobility [Срок оценки: Day 45]
• knee joint mobility [Срок оценки: month 12]
• pain assessment [Срок оценки: Day -1]
• pain assessment [Срок оценки: day 45]
• pain assessment [Срок оценки: month 12]
• the Knee Society Score (KSS) [Срок оценки: Day -1]
• the Knee Society Score (KSS) [Срок оценки: Day 45]
• the Knee Society Score (KSS) [Срок оценки: month 12]
• Knee injury and Osteoarthritis Outcome Score Physical Function Short form (KOOS-PS). [Срок оценки: day -1]
• Knee injury and Osteoarthritis Outcome Score Physical Function Short form (KOOS-PS). [Срок оценки: Day 45]
• Knee injury and Osteoarthritis Outcome Score Physical Function Short form (KOOS-PS). [Срок оценки: Month 12]