Biomechanical Analysis Of The Knee Joint Of The Forward Leg During A Fencing Lunge

Object:Through testing and analyzing the biomechanical index of six male fencers’forward leg during a fencing lunge, the research compares the results with the consultation of kinetic index of free falling a60-meter dais without initial velocity, in order to understand the forces in the forward leg during a fencing lunge, analyze the reason of knee joints injures, perfect and enrich our fencing training theory and prevent the athletic injures, which will eventually improve the effectiveness in the training and provide an easy access for the fencing researchers and coaches to the valuable references.Methods:First respectively collecting the data of the forward leg when the six fencers have finished the fencing lunge and of the ipsilateral leg when have fallen from the60meters dais by using VICON (infrared high-speed photography system) and KISTLER (three dimension test force platform). Second, modeling and data will be analyzed by Nexus and Visual3D, including Ground Reaction Force, Joint Moment, and Joint Force. Finally, Exce12010and Origin7.0will be used to tabulate statistics data and draw graphs.Results:1) In the process of landing and buffering of fencing lunge, the ground reaction forces are nearly equal to or sometimes surpass the falling from the60-meter bias2) The counter force will be formed at landing when the negative moment generated by keen joint collides with the ground reaction forces. The two forces are both at their maximum at the moment.3) In the whole process of landing and buffering, the enormous compressive force will be put upon knee joint. The direction of a force, different from the direction of the protection of ligament absorbing the stress, acts mainly on bones and cartilage, squeezing bone to bone.4) At the moment of landing, the intensive shearing force generated by knee joint makes the tibial retrusion, while the Posterior cruciate ligament will absorb a part of stress to prevent the tibial retrusion from moving so far.5) The two comparative movements differ in the directions of ground reaction forces, moment, and shearing force at landing.Conclusion:1) The knee joint injures will easily occur when the forward leg lands during fencing lunge.2) The injure of ischiocrural might be the common muscle damage.3) The enormous compressive force can result in inflammation of articular cartilage of patella or even stress fracture.4) The huge negative shearing force adds risk to injure of posterior cruciate ligament of knee.5) There is a great disparity in the landing pattern of the two movements.