{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T15:55:08Z","timestamp":1780502108384,"version":"3.54.1"},"reference-count":33,"publisher":"SAGE Publications","issue":"1","license":[{"start":{"date-parts":[[2019,3,6]],"date-time":"2019-03-06T00:00:00Z","timestamp":1551830400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["HIP International"],"published-print":{"date-parts":[[2020,1]]},"abstract":"<jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>Metal-on-metal total hip arthroplasty (MoM THA) is associated with the formation of pseudotumours. Studies mainly concern pseudotumour formation in large head MoM THA. We performed a long-term follow-up study, comparing pseudotumour incidence in small head metal-on-metal (SHMoM) THA with conventional metal-on-polyethylene (MoP) THA. Predisposing factors to pseudotumour formation were assessed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>From a previous randomised controlled trial comparing SHMoM (28 mm) cemented THA with conventional MoP cemented THA, patients were screened using a standardised CT protocol for the presence of pseudotumours. Serum cobalt levels and functional outcome were assessed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>56 patients (33 MoP and 23 MoM) were recruited after mean follow-up of 13.4 years (SD 0.5). The incidence of pseudotumours was 1 (5%) in the SHMoM THA cohort and 3 (9%) in the MoP THA cohort. Prosthesis survival was 96% for both SHMoM and MoP THAs. Serum cobalt levels did not exceed acceptable clinical values (&lt;5 \u00b5g\/L) whereas no differences in cobalt levels were detected at follow-up between both groups. Oxford and Harris Hip Scores were good and did not differ between SHMoM and MoP THA.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions:<\/jats:title>\n                    <jats:p>This long-term follow-up study shows a low incidence of pseudotumour formation and good functional outcome in cemented head-taper matched SHMoM and MoP THA.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/1120700019832877","type":"journal-article","created":{"date-parts":[[2019,3,6]],"date-time":"2019-03-06T08:19:45Z","timestamp":1551860385000},"page":"56-63","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":5,"title":["Pseudotumours, cobalt and clinical outcome in small head metal-on-metal versus conventional metal-on-polyethylene total hip arthroplasty"],"prefix":"10.1177","volume":"30","author":[{"given":"Hugo C","family":"van der Veen","sequence":"first","affiliation":[{"name":"Department of Orthopaedic Surgery, University Medical Centre Groningen, University of Groningen, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Inge HF","family":"Reininga","sequence":"additional","affiliation":[{"name":"Department of Traumasurgery, University of Groningen, University Medical Centre Groningen, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wierd P","family":"Zijlstra","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Medical Centre Leeuwarden, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martijn F","family":"Boomsma","sequence":"additional","affiliation":[{"name":"Department of Radiology, Isala Hospital, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sjoerd K","family":"Bulstra","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, University Medical Centre Groningen, University of Groningen, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos JAM","family":"van Raay","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Martini Hospital Groningen, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2019,3,6]]},"reference":[{"key":"bibr1-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1097\/00003086-199608001-00003"},{"key":"bibr2-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1097\/00003086-199608001-00007"},{"key":"bibr3-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1243\/095441105X69123"},{"key":"bibr4-1120700019832877","doi-asserted-by":"publisher","DOI":"10.3928\/01477447-20090527-06"},{"issue":"3","key":"bibr5-1120700019832877","doi-asserted-by":"crossref","DOI":"10.3928\/01477447-20100129-19","volume":"33","author":"Zijlstra WP","year":"2010","journal-title":"Orthopedics"},{"key":"bibr6-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.d7441"},{"key":"bibr7-1120700019832877","first-page":"A5564","volume":"156","author":"Verhaar JA.","year":"2012","journal-title":"Ned Tijdschr Geneeskd"},{"key":"bibr8-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1080\/00016470510030580"},{"key":"bibr9-1120700019832877","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-196951040-00012"},{"key":"bibr10-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.94B6.28373"},{"key":"bibr11-1120700019832877","doi-asserted-by":"crossref","first-page":"1141","DOI":"10.1007\/s00256-015-2146-0","volume":"44","author":"Boomsma MF","year":"2015","journal-title":"Skeletal Radiol"},{"key":"bibr12-1120700019832877","doi-asserted-by":"publisher","DOI":"10.3109\/17453674.2015.1022106"},{"key":"bibr13-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1533\/9780857096203"},{"key":"bibr14-1120700019832877","doi-asserted-by":"publisher","DOI":"10.2106\/JBJS.L.00716"},{"key":"bibr15-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.97B11.34541"},{"key":"bibr16-1120700019832877","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-197860020-00014"},{"key":"bibr17-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1177\/112070000901900406"},{"key":"bibr18-1120700019832877","first-page":"20","volume":"121","author":"DeLee JG","year":"1976","journal-title":"Clin Orthop Relat Res"},{"key":"bibr19-1120700019832877","first-page":"17","volume":"141","author":"Gruen TA","year":"1979","journal-title":"Clin Orthop Relat Res"},{"key":"bibr20-1120700019832877","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-199503000-00013"},{"key":"bibr21-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.90B7.20305"},{"key":"bibr22-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1016\/j.arth.2013.05.040"},{"key":"bibr23-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.98B5.35592"},{"key":"bibr24-1120700019832877","doi-asserted-by":"publisher","DOI":"10.5301\/hipint.5000269"},{"key":"bibr25-1120700019832877","unstructured":"National Institute for Health and Care Excellence. Total hip replacement and resurfacing arthroplasty for end-stage arthritis of the hip. Technology appraisal guidance [TA304]. https:\/\/www.nice.org.uk\/guidance\/ta304 (2014, accessed 27 August 2018)."},{"key":"bibr26-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1007\/s00264-013-2228-3"},{"key":"bibr27-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1016\/j.arth.2009.05.018"},{"key":"bibr28-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1016\/j.arth.2011.04.015"},{"key":"bibr29-1120700019832877","doi-asserted-by":"publisher","DOI":"10.2106\/JBJS.J.01720"},{"key":"bibr30-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1016\/j.arth.2013.06.022"},{"key":"bibr31-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1007\/s11999-015-4539-8"},{"key":"bibr32-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.96B7.32369"},{"key":"bibr33-1120700019832877","doi-asserted-by":"publisher","DOI":"10.1016\/j.arth.2010.11.004"}],"container-title":["HIP International"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/1120700019832877","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1177\/1120700019832877","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/1120700019832877","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T08:21:06Z","timestamp":1777450866000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/1120700019832877"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,3,6]]},"references-count":33,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2020,1]]}},"alternative-id":["10.1177\/1120700019832877"],"URL":"https:\/\/doi.org\/10.1177\/1120700019832877","relation":{},"ISSN":["1120-7000","1724-6067"],"issn-type":[{"value":"1120-7000","type":"print"},{"value":"1724-6067","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,3,6]]}}}