Effect of wear, acetabular cup inclination angle, load and serum degradation on the friction of a large diameter metal-on-metal hip prosthesis

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Saikko, Vesa
dc.date.accessioned 2019-04-02T06:57:38Z
dc.date.available 2019-04-02T06:57:38Z
dc.date.issued 2019-03-01
dc.identifier.citation Saikko , V 2019 , ' Effect of wear, acetabular cup inclination angle, load and serum degradation on the friction of a large diameter metal-on-metal hip prosthesis ' CLINICAL BIOMECHANICS , vol. 63 , pp. 1-9 . https://doi.org/10.1016/j.clinbiomech.2019.02.005 en
dc.identifier.issn 0268-0033
dc.identifier.other PURE UUID: d02719e9-6581-4369-af74-1caccd08849e
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/effect-of-wear-acetabular-cup-inclination-angle-load-and-serum-degradation-on-the-friction-of-a-large-diameter-metalonmetal-hip-prosthesis(d02719e9-6581-4369-af74-1caccd08849e).html
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85061571263&partnerID=8YFLogxK
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/37387
dc.description.abstract Background: The large-scale clinical problem caused by unacceptable tribological behaviour of certain large diameter metal-on-metal prosthetic hips has directed attention to adverse condition testing. High metal-on-metal wear is connected with adverse reaction to metal debris. Friction is important because high friction may be associated with high wear, risk the fixation of the cup, and cause detrimental heating of periprosthetic tissues. Methods: A friction measurement system was added to a multidirectional, established hip joint wear simulator, and its functionality was evaluated. In preliminary tests, a 50 mm diameter metal-on-metal prosthesis was tested in an optimal acetabular cup inclination angle (48°) and in a steep angle (70°) using a normal peak load (2 kN) and an increased peak load (3 kN). The test length was 100 h. Long-term adverse condition tests of 3 million cycles were run for three 52 mm metal-on-metal prostheses. The lubricant was diluted calf serum at 37 °C. Findings: In the 100 h tests, metal-on-metal frictional torque was not highly sensitive to the angle, load and serum degradation, and it was close to that of a conventional 28 mm prosthesis with a polyethylene cup, mostly below 5 Nm. However, a manyfold higher frictional torque (10 to 20 Nm) was observed in long-term metal-on-metal tests with substantial wear. Interpretation: To obtain a realistic prediction of the frictional behaviour of a hip design, long-term, multidirectional wear tests are necessary. The friction should preferably be measured during the wear test. In addition to normal conditions, adverse condition testing is strongly recommended. en
dc.format.extent 9
dc.format.extent 1-9
dc.language.iso en en
dc.publisher Elsevier Limited
dc.relation.ispartofseries CLINICAL BIOMECHANICS en
dc.relation.ispartofseries Volume 63 en
dc.rights embargoedAccess en
dc.subject.other Biophysics en
dc.subject.other Orthopedics and Sports Medicine en
dc.subject.other 216 Materials engineering en
dc.title Effect of wear, acetabular cup inclination angle, load and serum degradation on the friction of a large diameter metal-on-metal hip prosthesis en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Engineering Design
dc.contributor.department Department of Mechanical Engineering en
dc.subject.keyword Acetabular cup position
dc.subject.keyword Artificial joint
dc.subject.keyword Frictional torque
dc.subject.keyword Hip simulator
dc.subject.keyword Joint mechanics
dc.subject.keyword Metal-on-metal
dc.subject.keyword Biophysics
dc.subject.keyword Orthopedics and Sports Medicine
dc.subject.keyword 216 Materials engineering
dc.identifier.urn URN:NBN:fi:aalto-201904022518
dc.identifier.doi 10.1016/j.clinbiomech.2019.02.005
dc.date.embargo info:eu-repo/date/embargoEnd/2020-03-01


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