Model descriptions model_01 initial geometries were used, tension tests performed on all ligaments (note: the ligament geometries were not changed after this point, so these tests are still valid. model_02 - model_04 improvements were made to cartilage and meniscus geometries model_04 first full model which ran to 45 degree passive flexion (98% converged). patella was being "pushed away" by the MPFL,LPFL springs- noticed that febio linear springs are not tension- only model_04 Febio_02 MPFL, LPFL were changed from linear springs to discrete elements defined as tension only springs model_05 Manual editing of contact surfaces so there are no "spots" on the tie surfaces. model_06 MCL-FMB tie surface edited due to twisting of the MCL ** After thorough dissection of the MCL, it was decided that model 6 was too unrealistic. model_07 new MCL geometry, and tie surfaces based on dissection results.