The need for alternative bearings.
D000497:Alloys / Q000737:chemistry; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D019544:Equipment Failure Analysis; D006801:Humans; D007720:Knee Prosthesis; D009556:Niobium / Q000737:chemistry; D020959:Polyethylene / Q000737:chemistry; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013499:Surface Properties; D015040:Zirconium / Q000737:chemistry
D000497:Alloys; D009556:Niobium; D020959:Polyethylene; D015040:Zirconium