Cemented or Cementless Fixation
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.
|