Choosing a Knee Implant / Prosthesis - BoneSmart®

The metal prosthetic device in knee joint.A Closer Look At Above Knee Prosthetics.

Choosing a Knee Implant / Prosthesis

Even as researchers and surgeons continue to offer more options in prostheses and surgical procedures, Garino says the current technology is hard to beat. A hip or knee replacement is likely to last 20 years, he says. "The average patient takes a million steps a year. I challenge you to go home and find something in your house that you use a million times a year that has lasted for 20 years with no maintenance."

Of all prosthetic components, the knee system is arguably the most complex.

Below Knee | Prosthesis | Amputation

Although the metal in a prosthesis is highly polished and the polyethylene is intended to be wear-resistant, the daily rubbing of these surfaces against each other during normal movements creates tiny particles of debris. After many years, these wear particles may damage the surrounding bone, loosen the prosthesis, and require another knee or hip joint replacement.

A below-knee (BK) leg prosthesis typically consists of a custom-made socket, a pylon and a foot.

Surgical Techniques
While prosthesis makers are changing designs, materials, and manufacturing methods to try to lengthen the life of artificial knees and hips, surgeons are refining techniques or developing new ones to try to improve the outcomes. Doing surgery through smaller incisions and performing less radical surgeries are among these efforts.

C-Leg above knee prosthetic leg

A cemented prosthesis is held in place using an epoxy type cement that attaches the metal to the bone. An uncemented prosthesis has a fine mesh of holes on the surface that allows the bone to grow into the mesh and attaches the prosthesis to the bone. During the operation, trial components—the same size as the actual components used for your knee—will be tested for stability, range of motion and tracking of the kneecap.

A knee prosthesis lets your knee bend easily again

Xray from the front compared with illustration of knee prosthesis. The xray shows the knee implants including a tibial tray supporting the tibial plate, plus a femoral rocker fitted onto the end of the femur.

The kneecap, or patellar, part of the prosthesis is usually ..

Total knee replacement (TKR) is a surgical procedure in which the arthritic or damaged surfaces of the joint are removed and replaced with an artificial joint called a prosthesis. The artificial joint is designed to move just like a healthy human joint.

(kneecap) portion of the prosthesis is commonly cemented into place.

There are two main types of artificial knee replacement prosthesis—cemented and uncemented. Both types are widely used. In many cases, a combination of the two types are used. The kneecap, or patellar, part of the prosthesis is usually cemented into place. The choice to use a cemented or uncemented prosthesis is usually made by the surgeon based on your age and lifestyle, and your surgeon’s experience.

US5330532A - Knee joint prosthesis - Google Patents

One size does not fit all during total knee replacement surgery. Knee implants come in different sizes to accommodate various body sizes, types and needs. Several manufacturers make joint implants. Your knee replacement surgeon will select the implant that best fits your needs. The weight of the prosthesis will be more than the weight of the bone that is removed. The weight will vary according to your size, but in general may weigh one to two pounds. You will not notice the weight in your knee.

An improved total knee joint prosthesis having femoral, ..

Both are still widely used. In many cases a combination of the two types is used. The patellar (kneecap) portion of the prosthesis is commonly cemented into place. The decision to use a cemented or uncemented artificial knee is usually made by the surgeon based on your age, your lifestyle, and the surgeon's experience.