{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T08:48:37Z","timestamp":1777884517925,"version":"3.51.4"},"reference-count":30,"publisher":"SAGE Publications","issue":"3","license":[{"start":{"date-parts":[[1998,3,1]],"date-time":"1998-03-01T00:00:00Z","timestamp":888710400000},"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":[[1998,3,1]]},"abstract":"<jats:p>Previous studies have suggested that a controlled stiffness prosthesis is required to address the conflicting requirements of minimizing stress shielding and micromotion. The design for a controlled stiffness prosthesis is proposed and a preliminary analytical investigation performed to assess its predicted performance before fabrication of a prototype component. The novel prosthesis consisted of a cobalt-chrome core and a flexible composite outer layer. Varying the composite layer thickness allowed the prosthesis stiffness to be controlled. Three variants of the controlled stiffness prosthesis were critically assessed using the finite element method and their predicted performance compared with those of conventional prosthesis designs. The potential for stress shielding was assessed by examining the periosteal strain energy and the potential for migration assessed by examining the endosteal minimum principal cancellous bone stresses.<\/jats:p>\n                  <jats:p>Both the conventional and controlled stiffness implants performed poorly as press-fit prostheses. All the press-fit prostheses generated high cancellous bone stresses, suggesting that excessive migration of these implants would be likely. The controlled stiffness implants performed better than the conventional implants when bonded to the surrounding bone. Although the controlled stiffness implants did not eliminate stress shielding of the calcar, they produced higher strain energies than the conventional designs.<\/jats:p>\n                  <jats:p>The findings of this study are that osseointegrated controlled stiffness implants may perform better than current osseointegrated cementless prostheses and therefore it is worth while progressing to the next stage, of prototyping an implant.<\/jats:p>","DOI":"10.1243\/0954411981533944","type":"journal-article","created":{"date-parts":[[2002,10,1]],"date-time":"2002-10-01T19:24:52Z","timestamp":1033500292000},"page":"165-175","source":"Crossref","is-referenced-by-count":7,"title":["Preliminary investigation of a novel controlled stiffness proximal femoral prosthesis"],"prefix":"10.1177","volume":"212","author":[{"given":"J A O","family":"Sim\u00f5es","sequence":"first","affiliation":[{"name":"University of Aveiro Department of Mechanical Engineering Portugal"}]},{"given":"M","family":"Taylor","sequence":"additional","affiliation":[{"name":"University of London IRC in Biomedical Materials, Queen Mary and Westfield College"}]},{"given":"A T","family":"Marques","sequence":"additional","affiliation":[{"name":"University of Porto Department of Mechanical Engineering and Industrial Management Portugal"}]},{"given":"G","family":"Jeronimidis","sequence":"additional","affiliation":[{"name":"University of Reading Department of Engineering"}]}],"member":"179","published-online":{"date-parts":[[1998,3,1]]},"reference":[{"key":"bibr1-0954411981533944","doi-asserted-by":"publisher","DOI":"10.3109\/17453679308994602"},{"key":"bibr2-0954411981533944","doi-asserted-by":"crossref","first-page":"77","DOI":"10.1097\/00003086-198306000-00010","volume":"176","author":"Morscher E. W.","year":"1983","journal-title":"Clin. Orthop. and Related Res."},{"key":"bibr3-0954411981533944","doi-asserted-by":"publisher","DOI":"10.3109\/17453678809149357"},{"key":"bibr4-0954411981533944","doi-asserted-by":"crossref","first-page":"220","DOI":"10.1097\/00003086-199108000-00031","volume":"269","author":"Nistor L.","year":"1991","journal-title":"Clin. Orthop."},{"key":"bibr5-0954411981533944","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.75B4.8331120"},{"key":"bibr6-0954411981533944","doi-asserted-by":"crossref","first-page":"127","DOI":"10.1097\/00003086-198605000-00025","volume":"206","author":"Andrew T. A.","year":"1986","journal-title":"Clin. Orthop. and Related Res."},{"key":"bibr7-0954411981533944","first-page":"301","volume":"92","author":"Trager D.","year":"1989","journal-title":"Unfallchirurg"},{"issue":"2","key":"bibr8-0954411981533944","doi-asserted-by":"crossref","first-page":"191","DOI":"10.1002\/j.1097-4636.1987.tb00018.x","volume":"21","author":"Chrisi el P.","year":"1987","journal-title":"J. Biomed. Mater. Res., Appl. Biomater."},{"key":"bibr9-0954411981533944","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.76B3.8175844"},{"key":"bibr10-0954411981533944","doi-asserted-by":"publisher","DOI":"10.3109\/17453679408994626"},{"key":"bibr11-0954411981533944","doi-asserted-by":"crossref","first-page":"103","DOI":"10.1097\/00003086-198607000-00023","volume":"208","author":"Pilliar R. M.","year":"1986","journal-title":"Clin. Orthop. and Related Res."},{"key":"bibr12-0954411981533944","unstructured":"Kuiper J. H. Numerical optimization of artificial hip joint designs. PhD thesis, Katholieke Universitcit Nijmegen, The Netherlands, 1993."},{"key":"bibr13-0954411981533944","first-page":"76","volume-title":"Computer Methods in Biomechanics and Biomedicine","author":"Kuiper J. H.","year":"1993"},{"key":"bibr14-0954411981533944","first-page":"477","volume-title":"Composite Science and Technology","author":"Sim\u00f5es J. A. O.","year":"1996"},{"key":"bibr15-0954411981533944","doi-asserted-by":"publisher","DOI":"10.1016\/0021-9290(89)90063-8"},{"key":"bibr16-0954411981533944","unstructured":"Katoozian H., Davy D. T. Three-dimensional shape optimization of femoral components of total hip prostheses. In 1993 ASME Bioengineering Conference, BED, Vol. 24, 1993, pp. 552\u2013555."},{"key":"bibr17-0954411981533944","doi-asserted-by":"crossref","unstructured":"Blake T. A., Davy D. T., Saravanos D. A., Hopkins D. A. Numerical optimization of composite hip endoprostheses. In Proceedings of 4th AIAA\/USAF\/ NASA\/OAI Symposium on Multidisciplinary Analysis and Optimization, 1992, pp. 119\u2013129.","DOI":"10.2514\/6.1992-4703"},{"key":"bibr18-0954411981533944","doi-asserted-by":"publisher","DOI":"10.1016\/0021-9290(89)90231-5"},{"key":"bibr19-0954411981533944","volume-title":"ABQUS Users Manual","year":"1996"},{"key":"bibr20-0954411981533944","doi-asserted-by":"publisher","DOI":"10.1007\/BF00134322"},{"key":"bibr21-0954411981533944","doi-asserted-by":"publisher","DOI":"10.1016\/1350-4533(95)00018-I"},{"key":"bibr22-0954411981533944","first-page":"127","volume-title":"Simulation Modelling in Bioengineering","author":"Sim\u00f5es J. A. O.","year":"1996"},{"key":"bibr23-0954411981533944","doi-asserted-by":"crossref","first-page":"27","DOI":"10.1097\/00003086-199012000-00006","volume":"261","author":"Huiskes R.","year":"1990","journal-title":"Clin. 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