{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T15:41:47Z","timestamp":1784907707014,"version":"3.55.0"},"reference-count":18,"publisher":"SAGE Publications","issue":"8","license":[{"start":{"date-parts":[[2011,6,2]],"date-time":"2011-06-02T00:00:00Z","timestamp":1306972800000},"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":["Proc Inst Mech Eng H"],"published-print":{"date-parts":[[2011,8]]},"abstract":"<jats:p>With fluoroscopic analysis of knee implant kinematics the implant contour must be detected in each image frame, followed by estimation of the implant pose. With a large number of possibly low-quality images, the contour detection is a time-consuming bottleneck. The present paper proposes an automated contour detection method, which is integrated in the pose estimation.<\/jats:p>\n                  <jats:p>In a phantom experiment the automated method was compared with a standard method, which uses manual selection of correct contour parts. Both methods demonstrated comparable precision, with a minor difference in the Y-position (0.08\u2009mm versus 0.06\u2009mm). The precision of each method was so small (below 0.2\u2009mm and 0.3\u00b0) that both are sufficiently accurate for clinical research purposes.<\/jats:p>\n                  <jats:p>The efficiency of both methods was assessed on six clinical datasets. With the automated method the observer spent 1.5 min per image, significantly less than 3.9 min with the standard method. A Bland\u2013Altman analysis between the methods demonstrated no discernible trends in the relative femoral poses.<\/jats:p>\n                  <jats:p>The threefold increase in efficiency demonstrates that a pose estimation approach with integrated contour detection is more intuitive than a standard method. It eliminates most of the manual work in fluoroscopic analysis, with sufficient precision for clinical research purposes.<\/jats:p>","DOI":"10.1177\/0954411911407669","type":"journal-article","created":{"date-parts":[[2011,6,3]],"date-time":"2011-06-03T01:40:56Z","timestamp":1307065256000},"page":"753-761","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":6,"title":["Integrated contour detection and pose estimation for fluoroscopic analysis of knee implants"],"prefix":"10.1177","volume":"225","author":[{"given":"A H","family":"Prins","sequence":"first","affiliation":[{"name":"Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B L","family":"Kaptein","sequence":"additional","affiliation":[{"name":"Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B C","family":"Stoel","sequence":"additional","affiliation":[{"name":"Division of Image Processing, Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R G H H","family":"Nelissen","sequence":"additional","affiliation":[{"name":"Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J H C","family":"Reiber","sequence":"additional","affiliation":[{"name":"Division of Image Processing, Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E R","family":"Valstar","sequence":"additional","affiliation":[{"name":"Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands"},{"name":"Department of Biomechanical Engineering, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Delft, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2011,6,2]]},"reference":[{"key":"bibr1-0954411911407669","doi-asserted-by":"publisher","DOI":"10.1109\/10.495283"},{"key":"bibr2-0954411911407669","doi-asserted-by":"publisher","DOI":"10.1109\/ACV.1996.572053"},{"key":"bibr3-0954411911407669","doi-asserted-by":"publisher","DOI":"10.1109\/42.811310"},{"key":"bibr4-0954411911407669","doi-asserted-by":"publisher","DOI":"10.1016\/S0021-9290(03)00002-2"},{"key":"bibr5-0954411911407669","doi-asserted-by":"publisher","DOI":"10.1016\/j.jbiomech.2004.02.025"},{"key":"bibr6-0954411911407669","doi-asserted-by":"publisher","DOI":"10.1097\/01.blo.0000062384.79828.3b"},{"key":"bibr7-0954411911407669","doi-asserted-by":"publisher","DOI":"10.1007\/s00167-002-0330-y"},{"key":"bibr8-0954411911407669","doi-asserted-by":"publisher","DOI":"10.1115\/1.1691448"},{"key":"bibr9-0954411911407669","doi-asserted-by":"publisher","DOI":"10.1016\/j.jbiomech.2004.04.026"},{"key":"bibr10-0954411911407669","doi-asserted-by":"publisher","DOI":"10.1002\/jor.20141"},{"issue":"4","key":"bibr11-0954411911407669","first-page":"692","volume":"124","author":"Fregly B.","year":"2005","journal-title":"Trans. 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