Achieving uniformly excellent results from Total Knee Replacement is proving more difficult to achieve than from Hip Replacement and efforts to improve the operation continue. This difficulty is due to a number of factors, but much depends on implant design. The geometry of the knee is complex and movement is not just that of a simple hinge, with some side-to-side movement and rotation involved as well.
This prompts the Clinically Relevant Question from patients:
What type of knee will I get?
Even after "30 plus" years of development, there is still no complete agreement about which class of prosthesis best “mimics” normal anatomy although good results are possible with a number of implants in the right experienced hands. They fall into three broad categories, depending on the level of stability (or constraint) provided by the components:
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