{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T08:50:38Z","timestamp":1777884638396,"version":"3.51.4"},"reference-count":27,"publisher":"SAGE Publications","issue":"5","license":[{"start":{"date-parts":[[2008,5,1]],"date-time":"2008-05-01T00:00:00Z","timestamp":1209600000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Proc Inst Mech Eng H"],"published-print":{"date-parts":[[2008,5,1]]},"abstract":"<jats:p>\n                    The wear of metal-on-metal bearings is affected by various design parameters, such as the clearance or surface roughness. It would be very useful to have a significant indicator of wear according to these design parameters, such as the \u039b ratio. Three different batches of cast high- and low-carbon cobalt\u2014chromium hip implants (28 mm, 32 mm, and 36 mm diameters) were tested in a hip joint simulator for 2 \u00d7 10\n                    <jats:sup>6<\/jats:sup>\n                    cycles. Bovine calf serum was used as lubricant, and the samples were weighed at regular intervals during the test. The predictive role of the \u039b ratio on the wear behaviour was investigated. Three different configurations were tested to explore the wear rate for a broad range of \u039b ratios. The results of these studies clearly showed that the femoral heads of 36 mm diameter had the best wear behaviour with respect to the other two smaller configurations tested. From a predictive point of view, the \u039b ratios associated with the configurations tested could clearly indicate that the femoral heads of 36 mm diameter worked in the mixed-lubrication regime (\u039b&gt;1); all the smallest configurations (28 mm size) had \u03bb&lt; 1, thus showing their aptitude to work in the boundary lubrication regime, with substantially higher volume depletion due to wear. The \u039b values associated with the 32 mm size varied in a range around 1 (0.95&lt;\u039b&lt;1.16), suggesting the possibility of operating in the mixed-lubrication regime.\n                  <\/jats:p>","DOI":"10.1243\/09544119jeim370","type":"journal-article","created":{"date-parts":[[2008,7,17]],"date-time":"2008-07-17T08:19:26Z","timestamp":1216282766000},"page":"617-628","source":"Crossref","is-referenced-by-count":12,"title":["Predictive role of the \u039b ratio in the evaluation of metal-on-metal total hip replacement"],"prefix":"10.1177","volume":"222","author":[{"given":"S","family":"Affatato","sequence":"first","affiliation":[{"name":"Laboratorio di Tecnologia Medica, Istituti Ortopedici Rizzoli, Bologna, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M","family":"Spinelli","sequence":"additional","affiliation":[{"name":"Laboratorio di Tecnologia Medica, Istituti Ortopedici Rizzoli, Bologna, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M","family":"Zavalloni","sequence":"additional","affiliation":[{"name":"Laboratorio di Tecnologia Medica, Istituti Ortopedici Rizzoli, Bologna, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"W","family":"Leardini","sequence":"additional","affiliation":[{"name":"Laboratorio di Tecnologia Medica, Istituti Ortopedici Rizzoli, Bologna, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M","family":"Viceconti","sequence":"additional","affiliation":[{"name":"Laboratorio di Tecnologia Medica, Istituti Ortopedici Rizzoli, Bologna, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2008,7,16]]},"reference":[{"key":"bibr1-09544119JEIM370","unstructured":"1 Ministero S. Programmazione sanitaria e qualit\u00e0ricoveri ospedalieri 2007, available from http:\/\/www.ministerosalute.it\/programmazione\/sdo\/sdo.jsp."},{"key":"bibr2-09544119JEIM370","unstructured":"2 Doorn P. F., Campbell P., Amstutz H. C. Particle disease in metal-on-metal total hip replacements. In Metasul - a metal-on-metal bearing (Eds Rieker C., Windler M., Wyss U.), 1999, pp. 113\u2013119."},{"key":"bibr3-09544119JEIM370","unstructured":"3 Case P. Accumulation of wear debris in the human body. In Metasul - a metal-on-metal bearing (Eds Rieker C., Windler M., Wyss U.), 1999, pp. 133\u2013148."},{"key":"bibr4-09544119JEIM370","doi-asserted-by":"publisher","DOI":"10.1016\/0142-9612(80)90016-2"},{"key":"bibr5-09544119JEIM370","unstructured":"5 Fisher J., Ingham E., Stone M. H., Wroblewski B. M., Besong A. A., Tipper J., Firkins P., Minakawa H., Matthews J. B., Green T. Wear particle morphologies in artificial hip joints: Particle size is critical in the response of macrophages. In Metasul - a metal-on-metal bearing (Eds Rieker C., Windler M., Wyss U.), 1999, pp. 121\u2013124."},{"key":"bibr6-09544119JEIM370","first-page":"94","volume":"319","author":"Jacobs J. J.","year":"1995","journal-title":"Clin. Orthop. 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