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Issue title: A Selection of Papers from the International Symposium on Advanced Bio-Materials and Engineering '93 (ISABE '93)
Article type: Research Article
Authors: Mejia, Lito C. | Brierley, Thomas J.
Affiliations: MTS Systems Corporation, Minneapolis, Minnesota, USA
Abstract: A multistation (8-station) hip simulator has been designed and tested that provides a practical imitation of the motions and loads seen by the hip joint during a typical walking cycle. A biaxial rocking motion of ±23 degrees is synchronized with the respective resultant forces of the extension-flexion (heel-strike to toe-off) movements of the leg. This particular simulator provides a practical engineering in vitro implementation of the walking cycle. It also provides a realistic and practical compromise between general wear screening devices (such as pin-on-disk systems) and the intensive research accomplished through full scale simulation (full 6 degree-of-freedom systems) and modeling. Evaluation of system performance shows that control of rpm (revolutions-per-minute) for the desired axial rotation of 1 Hz was kept to 60 cpm ± 1 cpm for axial loads (per actuator) as high as 4500 Newtons. Although loading error was 2% in the peak load areas of interest (3000 Newton), station-to-station load control variability was less than .6%. Baseline wear studies with this simulator using ultra-high-molecular-weight polyethylene and Cobalt-Chromium (UHMWPE/CoCr) hip systems indicate an average specimen-to-specimen wear variability of less than 7% range after 5 million test cycles. Testing was performed in a calf serum environment at an equilibrium temperature of 33°C.
Keywords: prosthetic hips, joint simulator wear testing, implantable biomaterials, fatigue and wear of biomaterials, wear of polyethylene
DOI: 10.3233/BME-1994-4402
Journal: Bio-Medical Materials and Engineering, vol. 4, no. 4, pp. 259-271, 1994
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