What is a constrained total knee replacement?

Constraint is defined as the effect of the elements of knee implant design that provides the stability needed to counteract forces about the knee after arthroplasty in the presence of a deficient soft-tissue envelope.

What is the Journey knee replacement made of?

Unlike other implants that only available with cobalt chrome for their metal femoral components, the JOURNEY II Active Knee implant can also be made with a proprietary metal alloy called OXINIUM◊ Oxidized Zirconium.

How many two knees have been implanted globally?

Using advanced biomechanical modeling technologies; the JOURNEY BCS was the first TKA to accurately replicate the normal kinematic patterns of the healthy knee joint. Over 60,000 JOURNEY BCS knees have been implanted around the world.

What is oxidized zirconium?

Oxidized zirconium is a new material that combines the strength of a metal with the wear properties of a ceramic. It remains unknown whether implants with a zirconium femoral component can be used safely in TKA.

What is constrained prosthesis?

Constraint. definition. the ability of a prosthesis to provide varus-valgus and flexion-extension stability in the face of ligamentous laxity or bone loss.

What is a semi constrained knee replacement?

A constrained joint has the femoral portion physically attached to the tibial component and requires no ligamentous or soft tissue support. The semi-constrained TKA has two separate components that glide upon each other, but the physical characteristics of the tibial component prevent excessive femoral glide.

How long does a Smith and Nephew knee last?

How long will my partial knee implant last? It’s difficult to predict the lifespan of any individual knee implant. However, when good surgical technique and accurate instrumentation are combined with proper patient selection, the vast majority of patients remain trouble-free for up to and even beyond 10 years.

What is oxinium made of?

Oxinium™ is produced by heating zirconium alloy (97.5% zirconium + 2.5% niobium) in air. The outer 5µm of the head is oxidised to form the hard zirconium oxide.

Is the ACL preserved in TKA?

Bi-cruciate-retaining (BCR) total knee arthroplasty (TKA), which retains both the anterior (ACL) and posterior cruciate (PCL) ligaments, serves as an alternative to the traditional TKA procedure.

How long does a ceramic knee replacement last?

The new ceramic knee consists of a plastic tibial component and a metal (zirconium alloy) with a ceramic surface femoral component with a life expectancy of 20-25 years.

What is the percentage of successful knee replacements?

Surgeons have performed knee replacements for over three decades generally with excellent results; most reports have ten-year success rates in excess of 90 percent.

What is constrained condylar knee?

Constrained condylar knee (CCK) implants are commonly used in a revision setting. They are designed to fix the prosthesis to the host bone at epiphysis and diaphysis to provide good construct stability and provide flexibility to balance the knee in the coronal and sagittal planes.