Knee replacements may be “cemented” or “cementless” depending on the type of fixation used to hold the implant in place.
The majority of knee replacements are generally cemented into place. Cemented knee replacements have been used successfully in all patient groups for whom total knee replacement is appropriate, including young and active patients with advanced degenerative joint disease. 15 years of clinical reports support this conclusion.
Implant designs were introduced in the 1980’s that were intended to attach directly to the bone without the use of cement. Cementless designs rely on bone growth into the surface of the implant for fixation. Most implant surfaces are textured or coated so that the new bone actually grows into the surface of the implant. Screws or pegs may also be used to stabilize the implant until bone ingrowth occurs. Because they depend on new bone growth for stability, cementless implants may require a longer healing time than cemented replacements.
Each case is individual and your surgeon will evaluate your situation carefully before making any decisions. Do not hesitate to ask what type of fixation will be used in your situation, and why that choice is appropriate for you.