{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T14:14:55Z","timestamp":1790345695256,"version":"4.1.0"},"reference-count":41,"publisher":"American Veterinary Medical Association (AVMA)","issue":"11","license":[{"start":{"date-parts":[[2025,11,1]],"date-time":"2025-11-01T00:00:00Z","timestamp":1761955200000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["ajvr"],"published-print":{"date-parts":[[2025,11,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec id=\"sc_a1\">\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To evaluate whether femoral head diameter and head-to-neck ratio (HNR) influence prosthetic impingement-free motion (IFM) in canine total hip replacement (THR) using a press-fit cementless hip system in silico.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"sc_a2\">\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>This was a descriptive study conducted from January through June 2025. Twenty-eight head-neck combinations were assembled using 3-D stereolithographic files of cementless THR implants (Universal Hip System; BioMedtrix). For each implant combination, IFM was evaluated using a custom-built computer simulation software program around 3 orthogonal axes: abduction-adduction, flexion-extension, and internal-external rotation. Impingement-free motion was also evaluated in 3-D, characterized as the envelope where the femoral neck axis has IFM. Head diameter, neck diameter, and HNR were calculated, and their effects on IFM were analyzed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"sc_a3\">\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Larger femoral head diameters were associated with increased IFM in all directions. Each increase in head size corresponded to a 16% to 33% gain in IFM. The presence of a head collar reduced 3-D IFM by 10% to 36%. The IFM loss was larger for smaller head sizes. Higher HNRs were strongly and positively associated with 3-D IFM. The IFM in internal and external rotation occurred beyond estimated physiologic hip motion when HNR was larger than 1.6.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"sc_a4\">\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Femoral head size and HNR are key determinants of IFM in the simulated canine THR model. The use of larger heads without collars improves prosthetic mobility and may reduce in vivo prosthetic impingement.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"sc_a5\">\n                    <jats:title>Clinical Relevance<\/jats:title>\n                    <jats:p>The risk of postoperative prosthetic luxation in canine THR may be reduced through proper implant selection and maximizing IFM.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.2460\/ajvr.25.06.0223","type":"journal-article","created":{"date-parts":[[2025,8,14]],"date-time":"2025-08-14T12:42:56Z","timestamp":1755175376000},"source":"Crossref","is-referenced-by-count":1,"title":["In silico modeling of total hip replacement with press-fit cementless system in dogs shows impingement-free motion is greater with larger head-to-neck ratios"],"prefix":"10.2460","volume":"86","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1135-7174","authenticated-orcid":true,"given":"Ming","family":"Lu","sequence":"first","affiliation":[{"name":"JD Wheat Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, University of California-Davis, Davis, CA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5025-2551","authenticated-orcid":true,"given":"Ching-Ho","family":"Wu","sequence":"additional","affiliation":[{"name":"Institute of Veterinary Clinical Sciences, School of Veterinary Medicine, College of Bioresources and Agriculture, National Taiwan University, Taipei, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0344-5465","authenticated-orcid":true,"given":"Po-Yen","family":"Chou","sequence":"additional","affiliation":[{"name":"JD Wheat Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, University of California-Davis, Davis, CA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brett","family":"Morgan","sequence":"additional","affiliation":[{"name":"Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California-Davis, Davis, CA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1404-7275","authenticated-orcid":true,"given":"Cheng-Chung","family":"Lin","sequence":"additional","affiliation":[{"name":"Department of Electrical Engineering, College of Science and Engineering, Fu Jen Catholic University, New Taipei City, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6596-5928","authenticated-orcid":true,"given":"Denis J.","family":"Marcellin-Little","sequence":"additional","affiliation":[{"name":"JD Wheat Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, University of California-Davis, Davis, CA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1272","reference":[{"issue":"1","key":"B1","series-title":"Vet Surg","first-page":"71","article-title":"Evaluation of functional outcome after BFX total hip replacement using a pressure sensitive walkway","author":"Lascelles BD","year":"2010","unstructured":"Lascelles BD, Freire M, Roe SC, DePuy V, Smith E, Marcellin-Little DJ. 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