Project 183 – Radiostereometric Analysis (RSA) of two uncemented tibial components in total knee arthroplasty

24 Jan 2019

Dr Jonathan Mulford

The knee is a hinge joint involving the thigh bone (femur) and the shin bone (tibia). Knee replacement surgery is a technique that removes a diseased knee joint and replaces it with an artificial joint (prosthesis). The most common reason for this operation is severe osteoarthritis, which causes relentless pain, joint deformity and mobility problems. Knee replacement surgery is known as ‘total knee arthroplasty’.This project aims to look at two types of knee replacements. They will compare a well established knee replacement to a new 3D printed knee replacement. The new approved 3D printed tibial base plate in theory should have less movement than the current tibial base plate. Despite the theoretical benefits there currently no RSA trials showing whether the new tibial prosthesis show less movement after surgery leading to better long-term outcomes.

To investigate the movement of the tibial base plate special markers are attached on to the two different knee replacements. This will allow special X-rays to be performed at different time periods to detect any movement of the knee replacement on the bone. Special X-rays and computer software can then interpret changes in movement over time.