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Therefore, distal femoral osteotomy (DFO) is recommended in dogs affected with severe MPL and a distal femoral varus deformity. The presence of an anatomic lateral distal femoral angle (aLDFA) of \u2265\u2009102\u00b0 has been anecdotally recommended as an indication for performing corrective DFO in large-breed dogs. However, the effect of a femoral varus deformity on MPL has not been scientifically evaluated. We aimed to evaluate the influence of a femoral varus deformity on MPL using a finite element method based computer model.<\/jats:p>\n                    <jats:p>Three-dimensionally reconstructed computed tomographic images of a normal femur from a Beagle dog were deformed using meshing software to create distal varus deformities. A total of thirteen aLDFAs, including 95\u00b0, 98\u00b0 and 100\u00b0\u2013110\u00b0, were simulated. The patellar positions and reaction force between the patella and trochlear grooves were calculated for all finite element models under constant rectus femoris muscle activation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The patella was displaced medially from the trochlear groove at an aLDFA of \u2265103\u00b0. With an aLDFA of 103\u00b0 to 110\u00b0, the reaction force was equal to zero and then decreased to negative values during the simulation, while other models with aLDFAs of 95\u00b0, 98\u00b0, and 100\u00b0-102\u00b0 had positive reaction force values. The patella began to luxate at 24.90 seconds (sec) with an aLDFA of 103\u00b0, 19.80 sec with an aLDFA of 104\u00b0, 21.40 sec with an aLDFA of 105\u00b0, 20.10 sec with an aLDFA of 106\u00b0, 18.60 sec with an aLDFA of 107\u00b0, 15.30 sec with an aLDFA of 108\u00b0, 16.60 sec with an aLDFA of 109\u00b0, and 11.90 sec with an aLDFA of 110\u00b0.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Severe distal femoral varus with an aLDFA of \u2265103\u00b0 caused MPL when other anatomical factors were controlled. Thissimplified computer model provides complementary information to anecdotal cutoffs for DFO, hence it should be applied to clinical patients with caution.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12917-020-02644-5","type":"journal-article","created":{"date-parts":[[2020,12,3]],"date-time":"2020-12-03T04:02:58Z","timestamp":1606968178000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Biomechanical analysis of canine medial patellar luxation with femoral varus deformity using a computer model"],"prefix":"10.1186","volume":"16","author":[{"given":"Jiyun","family":"Lee","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heedong","family":"Sim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaemin","family":"Jeong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sun-Young","family":"Kim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seokjo","family":"Yang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"SeongMok","family":"Jeong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"HaeBeom","family":"Lee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,12,3]]},"reference":[{"key":"2644_CR1","doi-asserted-by":"publisher","first-page":"855","DOI":"10.1016\/S0195-5616(93)50087-6","volume":"23","author":"JK Roush","year":"1993","unstructured":"Roush JK. 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