| A large number of research literature suggests that sports injury of knee joint is a table tennis player easily happened.Knee joint injury for table tennis athletes in sports training and competition has brought serious influence.Table tennis athletes in complete main footwork is,however,didn't know the mechanical characteristics of knee joint.This research adopts the research methods of sports biomechanics,Beijing sports university selected excellent table tennis athletes,using infrared light spot motion analysis system and 3-d force platform measurement and control system for different gender athletes during the process of complete the way leapfrog stride footwork movement data of kinematics and dynamics of lower limbs.Then in the table tennis players were obtained through the inverse dynamics calculation methods to further complete the footwork,step way,leapfrog,lower limb three-dimensional each joint Angle and the biomechanical indexes such as three-dimensional force and torque.To determine the factors related to the table tennis athletes knee joint load,through statistical analysis,determine the relationship between the various factors,and analyze the possible causes of the knee joint injury risk factors.Different gender table tennis players in the process of complete different gait load characteristics of the knee joint.This research-mainly get the following conclusion:(1)Table tennis athletes in complete three steps when the knee joint load vertical force is the largest,is 1.5 times their own weight;Around the knee joint and the direction of the maximum load is about 0.5 times their own weight.Knee joint force did not show the gender differences of men and women.Knee joint by torque and torque and adduction outreach is about 0.05 BH*BW,the maximum torque and screw in screw torque maximum around 0.02 BH*BW.Leapfrog footwork adduction torque,outreach moment shows the gender differences of men and women.(2)The table tennis athletes in complete three gait,the knee joint of vertical force showed a stride than the way and the trend of leapfrog,so complete step footwork when the knee joint damage more easily.Knee joint torque at the completion of 3 footwork when the knee joint torque has no apparent differences.From the Angle of knee joint,leapfrog footwork knee range is less than the way and stride.Three step by step method of knee spin outside,gender differences,women than men.(3)Table tennis players to complete three steps when the load on the knee joint simply have a vertical force for the influence of the knee joint injury is not obvious,but if with around and around the direction of the force at the same time,lead to the knee joint in the oppressed with twist and the action of friction,the knee injury is very serious;Knee three-dimensional torque is also three directions torque acting on the knee joint at the same time,the impact of knee joint injury.(4)Table tennis requires athletes knee joint in a bent position for a long time,and in the process of training and competition beat back and forth and around mobile,the knee joint kept turning back and forth,friction,accumulated for a long time will produce chronic injury to the knee joint.(5)Athletes weight was positively correlated with table tennis athletes knee joint load.The greater the weight,the greater the knee joint load,increases the risk of knee joint injury.The wrong action,incorrect knee will aggravate the knee joint injury. |
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