In knee arthroplasty, which statement accurately describes cemented versus cementless bearing components?

• A. Cemented components are fixed with bone cement; cementless rely on press-fit and osseointegration through porous surfaces; both aim for durable fixation with different revision considerations.
• B. Cemented components are used only in pediatric knees.
• C. Cementless components do not require sterilization.
• D. Cemented components cannot be revised.

Answer: (A)

In knee arthroplasty, the fixation method distinguishes cemented from cementless bearing components. Cemented components are anchored with bone cement (PMMA) to achieve immediate, stable fixation. Cementless components rely on a press-fit into the bone and a porous surface that encourages bone to grow into the implant (osseointegration) for long-term stability. Both approaches aim for durable fixation, but they differ in revision considerations: cemented implants are typically easier to revise because the cement mantle can be removed, whereas cementless implants depend on bone ingrowth and can be more challenging to revise due to the need to deal with integrated bone and porous coating. Hence, a statement that cemented components use bone cement and cementless rely on press-fit and osseointegration, with different revision implications, best describes the relationship.