Computer modelling of patellar instability in association with trochlear dysplasia
Constructed a dynamic model of patelofemoral joint on human-based simulation computer model of a complex system of movement connected elastic and rigid bodies. Options patella biomechanical movement of bodies connected by joints defined by vector given angular velocity of rotation of the tibia. Patella speed depends on patellar spring-equivalents tension forces in connection, providing interaction force between the bodies of the simulation model. In this article, using of information technologies and application software a dynamic simulation model of patellofemoral joint is created. By calculation and theoretical determination of the angular, linear displacements of the patella, and the equivalent of von Mises stress in the patellar cartilage at knee flexion from 0° to 30° in normal and patellar instability, which is accompanied by trochlear dysplasia type A and B established that the concentrators at patellar instability are placed only on the lateral facet, regardless of the type of trochlear dysplasia. Type of dysplasia affects patellar displacement and distribution of von Mises equivalent stress in the patellar cartilage in normal and at instability. The adequacy of the results of the numerical experiment tested by convergence controlled parameters values of stresses in the zones of maximum gradient.