| ObjectiveTo investigate the positions and the types of ankle injury and the incidence of different injuries in parachuting- soldiers while they executed daily ground train and parachute train. In these inquisitions, we found out some factors of ankle injury and investigated the correlation among these factors. By carry through statistic analysis, we analyzed these outcomes and discovered the relationship of various injury factors. According to the result of the Epidemiology invigastion, we put a biomechanics experiment into practice with 10 ankle joint specimens of human in order to find out how to reduce the impress force which results in some injuries of the ankle joint ligaments and the bone structure.Methods(1) we design a questionnaire to get the messages of the positions and the types of ankle injury of all soldiers. In the process of investigate, in order to promise the objectivity of the data, we check a lot of records of the hospital, sanitation of troops. In the meantime, we, in detail, inquired about the parahuteing train, loading posture ,umbrella type and equipments, etc.(2) when we have collected all data of various injuries, a analysis will be executed to the result in 8 kinds of familiar reason that the ankle joint hurt and find out interrelated danger factor and protective factors. The statistics findings will be analyzed with X2 examination, T examination and SPSS software. (3) we gain some data from a biomechanical experiment about 10 fresh ankle joint specimens of the human body and force on these specimens to induce some injuries in ankle joints. We use a square to differ analysis to three sets of different data.Results(1)We inquired 397 soldiers and of the total,, there are 173 soldiers who had suffer from different injuries between 2004 and 2006, including 70 cases of the ankle joint hurt, 13 cases of the knee joint hurt, 49 cases of the spinal column hurt, 41 cases of other parts hurt.(2) Moreover, We inquired 32 soldiers including 18 cases whose ankle joints or the tibia and fibula hurt and 14 cases who have never suffer from injuring. We used SPSS software to analysis two groups. The result showed that the ground circumstance(X2) and the direction of wind(X5) were risk factors, the ankle bands (X3) and the prachuting years (X8) were protective factors. (3) We made use of 10 fresh ankle joints of human body to carry on the biomechanics measurement. The lateral collateral ligament would be hurt at 2062.62 Ns on average and the bone structure need 3380. 28 Ns on average when these hurts occured .Conclusion(1) These injuries can take place in different conditions. A soldier can be hurt when he land after parachuting with the error operation to the parachute and the error posture.(2) The injury of ankle joint often occur as the parachutist train on parachuting and the injury of spine more take place when training on the ground. Moreover, the degree of injury following fracture is awfully severe. The only fracture in anklebone seldom happened owing to special loading posture.(3)In 8 harm factors, the ground circumstance(X2) and the direction of wind(X5) were risk factors, the ankle bands (X3) and the parachuting years (X8) were protective factors. The ankle band must play an important role to void the injury of ankle joint.(4) The varus of ankle joint made the ligament strain so that it can be injured easily. In the condition, it need press the weight of 2603.62N on the ligament. The weight of 3380.28 N on average can lead to hurt of bone structure on the neutral site.
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