{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,6]],"date-time":"2026-06-06T15:21:01Z","timestamp":1780759261155,"version":"3.54.1"},"reference-count":28,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2011,11,16]],"date-time":"2011-11-16T00:00:00Z","timestamp":1321401600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Knee surg. sports traumatol. arthrosc."],"published-print":{"date-parts":[[2012,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>The objective of this study was to determine the effect of patellar morphology and implant design on patellofemoral contact stress in total knee arthroplasty (TKA) without patellar resurfacing.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p><jats:italic>Radiographic investigation:<\/jats:italic> One hundred and fifty\u2010seven knees of 127 patients were included in the study. Implants used in the present series were Low Contact Stress (LCS), Genesis II and NexGen. The relationship between the pre\u2010operative patellar facet angle and newly identified post\u2010operative osteosclerosis was assessed. <jats:italic>Finite element analysis:<\/jats:italic> Using patient\u2010specific patellar three\u2010dimensional finite element models, the relationship between the patellar facet angle and mean von Mises stress within the patella was calculated at flexion angles of 15\u00b0, 45\u00b0, 75\u00b0 and 105\u00b0.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p><jats:italic>Radiographic investigation:<\/jats:italic> Post\u2010operative osteosclerosis was observed with decreasing patellar facet angle in the Genesis II (odds ratio = 0.72; 95% confidence interval, 0.55\u20130.93; <jats:italic>P<\/jats:italic> = 0.012) and NexGen implants (odds ratio = 0.87; 95% confidence interval, 0.77\u20130.99; <jats:italic>P<\/jats:italic> = 0.029). Patients treated with the Genesis II had significantly more advanced osteosclerosis than those treated with the other two implants. <jats:italic>Finite element analysis:<\/jats:italic> A negative correlation was found between the patellar facet angle and the mean von Mises stress for all three implants. The Genesis II showed significantly higher von Mises stress than the other two implants at flexion angles of 15\u00b0, 45\u00b0 and 105\u00b0.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Both patellar morphology and femoral component geometry influence patellofemoral contact stress in total knee arthroplasty without patellar resurfacing.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>Case control study, Level III.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-011-1768-6","type":"journal-article","created":{"date-parts":[[2012,3,7]],"date-time":"2012-03-07T16:13:13Z","timestamp":1331136793000},"page":"1787-1795","source":"Crossref","is-referenced-by-count":26,"title":["Patellar morphology and femoral component geometry influence patellofemoral contact stress in total knee arthroplasty without patellar resurfacing"],"prefix":"10.1002","volume":"20","author":[{"given":"Atsushi","family":"Takahashi","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Orthopaedic Surgery Tohoku University School of Medicine 1\u20101 Seiryo\u2010machi, Aoba\u2010ku 980\u20108574 Sendai Miyagi Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hirotaka","family":"Sano","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Orthopaedic Surgery Tohoku University School of Medicine 1\u20101 Seiryo\u2010machi, Aoba\u2010ku 980\u20108574 Sendai Miyagi Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masahiro","family":"Ohnuma","sequence":"additional","affiliation":[{"name":"<!--<label>2<\/label>--> Department of Orthopaedic Surgery Sendai Red Cross Hospital 2\u201043\u20103 Yagiyamahoncho, Taihaku\u2010ku 982\u20108501 Sendai Miyagi 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