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Abstract
A total hip simulator was used to determine the friction and wear properties of Charnley-type (316L stainless-steel balls and sterile ultrahigh-molecular-weight polyethylene cups) hip prostheses. Three different sets of specimens were tested to 3.95 × 105, 10.15 × 105, and 23.31 × 105 walking cycles, respectively. All tests were run unlubricated, at ambient conditions (22° to 26°C, 30 to 50 percent relative humidity), at 30 walking cycles per minute, under a dynamic load simulating walking.
Polyethylene cup wear rates ranged from 1.4 to 3.9 × 10−13 m3/m which corresponds to dimensional losses of 4.0 to 11 μm per year. Although these wear rates are lower than those obtained from other hip simulators and from in vivo X-ray measurements, they are comparable when taking run-in and plastic deformation into account. Maximum tangential friction forces ranged from 93 to 129 N under variable load (267 to 3090 N range) and from 93 to 143 N under a static load of 3090 N.
Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference in San Diego, California, October 22–24, 1984
Notes
Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference in San Diego, California, October 22–24, 1984