Which bearing surface is most commonly linked to wear debris and osteolysis?

• A. Metal-on-polyethylene
• B. Ceramic-on-ceramic
• C. Ceramic-on-polyethylene
• D. Metal-on-metal

Answer: (A)

Wear debris–driven osteolysis is most classically tied to polyethylene particles generated by a metal-on-polyethylene bearing. These tiny polyethylene wear particles are released into the surrounding tissue, are phagocytosed by macrophages, and trigger a chronic inflammatory response with cytokines such as TNF-alpha and IL-1. This inflammatory milieu stimulates osteoclast activity via RANKL, leading to bone resorption around the implant and eventual aseptic loosening.

Ceramic surfaces, including ceramic-on-ceramic or ceramic-on-polyethylene, produce far fewer wear particles and tend to have lower osteolysis risk. Metal-on-metal generates metal ions and local tissue reactions rather than the classic polyethylene particle–driven osteolysis, though it carries other specific complications.