Highly cross-linked polyethylene used in modern total hip arthroplasty is produced by subjecting conventional ultra-high molecular weight polyethylene to which process?
- A Gamma irradiation followed by thermal treatment ✓
- B Autoclave sterilization under high pressure
- C Ethylene oxide gas sterilization
- D Plasma coating with titanium particles
Correct answer: A. Gamma irradiation followed by thermal treatment
Explanation
Highly cross-linked polyethylene is produced by irradiating UHMWPE with gamma or electron beam radiation, which creates cross-links between polymer chains. This is followed by thermal treatment (annealing or remelting) to eliminate free radicals that would otherwise cause oxidation. This process dramatically reduces wear rates compared to conventional polyethylene.
Reference: Orthopaedic Basic Science, 5th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.