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- W1590189283 abstract "Theory, supported by some experimental evidence, suggests that metal-on-metal (m-m) hip implants can have protective elastohydrodynamic lubrication films during continuous walking that may reduce wear. A simple transient model indicated that such films were remarkably constant during continuous motion and could prevent surface contact of smooth, low clearance implants. However, these films could both form and breakdown rapidly during intermittent motion in vivo. Thus, a more representative simulator motion protocol was specified involving repeated cycles of Stopping, dwelling with a constant load for 1 minute and starting 10 minute sessions that applied continuous walking conditions. An automatic control system was designed and to implement this protocol in a hip simulator. Six implants were tested for about 3 million cycles (Mc) under the developed stop-dwell-start motion protocol. Compared with continuous motion testing of similar implants, the wear at 3 Mc approximately doubled (from about 0.6 to 1.2 mm3) and wear rates showed considerable increase (from 0.04 to 0.19 mm3/Mc). The simulator wear of m-m hip implants should be investigated during intermittent as well as continuous motions. Ultimately, designs should address the issue of wear during stop-dwell-start motion protocols." @default.
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- W1590189283 date "2002-01-01" @default.
- W1590189283 modified "2023-09-25" @default.
- W1590189283 title "Stop-dwell-start motion: a novel simulator protocol for the wear of metal-on-metal hip implants" @default.
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- W1590189283 doi "https://doi.org/10.1016/s0167-8922(02)80041-4" @default.
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