Computer modeling of biomechanical systems "femoral bone - endoprosthesis / transplant - tibia" in different methods of anterior cruciate ligament plastics in knee joint

The aim: to specify the indices of dislocation (displacement) and effective stress in biomechanical systems «femoral bone — endoprosthesis / transplant — tibia» in different methods of anterior cruciate ligament by computer modeling of a knee joint geometrically, physically and mechanically similar to human. Material and Methods. Steady-state tasks of the stress given on a knee joint after anterior cruciate ligament plastics fulfilled by different methods were resolved numerically by the method of finite elements implemented in the system of finite element analysis. Results. Maximum dislocations comprised 3.45 mm. for the method of single-beam plastics of ACL, 0.35 mm. for two-beam plastics and 0.93 mm. for plastics with semi-tendinous and gracilis tendons. Maximum stress were 1190 MPa for single-beam plastics of ACL, 141 MPa for two-beam plastics and 150 MPa for plastics with semi-tendinous and gracilis tendons. Conclusion. Finite element modeling of different ways of ACL plastics indicates higher stability of synthetic endoprosthesis under rising stress in case of two-beam plastics and transplant of semi tendinous and gracilis tendons compared to the single-beam plastics.