膝上截肢患者行走过程中的滑倒危险性分析

Slip risk analysis for trans-femoral amputees during level walking

为了研究膝上截肢患者在平地行走过程中所面临的滑倒危险性,共有10名男性健康受试者和6名男性单侧膝上截肢患者参加了试验。每位受试者均在干燥路面条件下,以自然步态进行3次行走试验。试验过程中,分别采集受试者的运动学参数和地面反力。利用地面反力计算出每位受试者行走过程中所需最大摩擦因数(RCOFPEAK)以及额状面内的侧向力对所需最大摩擦因数的贡献率(RX),并且分别进行单因素方差分析(ANOVA)。结果表明:截肢患者所面临的滑倒危险性明显大于健康受试者;行走过程中截肢患者的身体在额状面内的摇摆增大,使得侧向地面反力明显增大,这是截肢患者的滑倒危险性显著增大的主要原因。

The slip risk of trans femoral amputees while walking on a level surface was investigated using ten healthy male subjects and six unilateral trans femoral male amputees. Each of the subjects was required to walk three times on a dry surface at a self selected comfortable pace. The kinematic and kinetic data were recorded in each trial, The peak required coefficient of friction （RCOFPEAK） and the contribution of the lateral force to the RCOFPEAK were calculated using ground reaction force data. These two parameters were then compared between the two groups using a one way analysis of variance （ANOVA）, The study shows that trans-femoral amputees face significantly greater slip risk than healthy subjects during level walking with the increase of the body swing in the frontal plane obviously causing the increased ground reaction force in the lateral direction.