Prosthesis preference is related to stride-to-stride fluctuations at the prosthetic ankle

  • Wurdeman S
  • Myers S
  • Jacobsen A
 et al. 
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The purpose of this study was to determine the relationship between stride-to-stride fluctuations and prosthe - sis preference. Thirteen individuals with unilateral, transtibial amputation consented to particip ate. Individuals walked on a treadmill for 3 min with their pr escribed and an alternate pros - thesis. Stride-to-stride fluctuat ions were quantified with the largest Lyapunov exponent (LyE) of each joint flexion/exten - sion time series. The change in the LyE was calculated for each major lower-limb joint for both conditions. Participants indi - cated preference between the prosth eses on a continuous visual analog scale. The change in th e LyE was correlated with the degree of preference between th e two prostheses at the pros - thetic ankle. The change in the LyE of the prosth etic ankle was strongly related to the degree of preference ( r = 0.629, p = 0.02). Thus, stride-to-stride fluctuations, quantified by the LyE, are strongly related to the patient’s perception of the prosthesis. As a result, the LyE is the first objective measure to detect changes in gait that relate to the patient’s perception of the prosthesis. The LyE should be further examined as a poten - tially effective pres criptive and outcome measure in prosthetic rehabilitation

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  • Shane R. Wurdeman

  • Sara A. Myers

  • Adam L. Jacobsen

  • Nicholas Stergiou

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