Posterior cruciate ligament retaining (CR) TKA

Posterior cruciate ligament retaining (CR) TKA

Posterior cruciate ligament retaining (CR) TKA has been advocated for its beneficial effect on femoral translation on the tibial plateau, improving flexion, increasing the efficiency of the quadriceps muscle, improving joint stability, and reducing tibial shear forces. Data from the National Joint Replacement Registry (NJR) of the United Kingdom in 2018 showed that 57% of all primary knee arthroplasties were posterior cruciate ligament retaining (CR) TKA and fixed with bone cement, while the American Joint Replacement Registry (AJRR) showed that 40.4% of primary knee arthroplasties were posterior cruciate ligament retaining (CR) TKA in 2017 (Fig. 1).

During normal knee movement, posterior cruciate ligament (PCL) bears a lot of load, so it plays an important role in function; PCL can cause the femur to move backward relative to tibia or "roll back" during knee flexion. In the high flexion state, the anterolateral bundle of PCL is considered to limit the medial and lateral displacement of the tibia, while the posteromedial bundle limits the anteroposterior translation of the tibia.

Different from the posterior cruciate ligament substituting (PS) knee prosthesis, the cam column mechanism is used to achieve the knee joint roll back, The posterior cruciate ligament (PCL) retaining, combined with effective PCL balance and appropriate choice of tibial bearing, can increase the range of motion (ROM), reduce the shear force between implant and bone, and maintain proprioception on the basis of ensuring the femoral roll back. Therefore, the appropriate design of CR or PS total knee prosthesis can be selected according to the judgment of ligament degeneration, implant type and doctor's preference.

JUST SKII provides PS and CR total knee joint system to realize the integration of multiple mechanisms and meet the different needs of doctors and patients.