A brief review of the design principles and performance in joint replacement registries.
Joseph Maratt, MD | August 30, 2020
During a knee replacement, the arthritic and damaged joint is resurfaced with metal and plastic implants.
There are over 150 different knee replacement implants on the market today. Many of their origins can be traced back to innovative designs from the 1970s. Traditional knee replacement designs can be grouped into 2 broad categories - ones that rely on a ligament within the knee and others that substitute for it with features like a cam and post.
The medial stabilized total knee design was introduced in the early 2000s to better reproduce the functional anatomy and more closely replicate the normal movement and stability of the knee.
Research shows that the medial side of the knee is more stable than the lateral. The medial stabilized designs attempt to mimic that asymmetric stability with the medial side more stable than the lateral.
These implants have shown good long-term outcomes along with better functional outcomes in several studies.
Registries can report the real world performance of implants across institutions and users in a region. They can provide valuable and actionable data to guide practice.
A recent report of registry data showed that the medial stabilized knee replacement design has comparable survivorship to traditional designs despite the greater degree of constraint.