Variability and stability analysis of walking of transfemoral amputees

Lamoth, Claudine J. C.; Ainsworth, Erik; Polomski, Wojtek; Houdijk, Han

doi:10.1016/j.medengphy.2010.07.001

Cited by 142 publications

(187 citation statements)

References 43 publications

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“…The comparison of LyE from an accelerometer attached to the trunk and joint angle flexion/extension is not possible. However, it is interesting that Lamoth et al reported increased LyE values for the individuals with limb loss compared with the nonaffected control subjects [48]. This is consistent with a preference expressed by the current group of individuals in this study for the prosthesis that had decreased LyE values, or values possibly closer to that found in nonaffected control subjects.…”

Section: Lyapunov Exponent: Another Tool In Limb-loss Rehabilitationsupporting

confidence: 89%

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

Wurdeman

Myers

Jacobsen³

et al. 2013

JRRD

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Abstract-The purpose of this study was to determine the relationship between stride-to-stride fluctuations and prosthesis preference. Thirteen individuals with unilateral, transtibial amputation consented to participate. Individuals walked on a treadmill for 3 min with their prescribed and an alternate prosthesis. Stride-to-stride fluctuations were quantified with the largest Lyapunov exponent (LyE) of each joint flexion/extension time series. The change in the LyE was calculated for each major lower-limb joint for both conditions. Participants indicated preference between the prostheses on a continuous visual analog scale. The change in the LyE was correlated with the degree of preference between the two prostheses at the prosthetic ankle. The change in the LyE of the prosthetic 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 potentially effective prescriptive and outcome measure in prosthetic rehabilitation.

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Section: Lyapunov Exponent: Another Tool In Limb-loss Rehabilitationsupporting

confidence: 89%

“…Lamoth et al [48] are the only other authors besides Segal et al [47] to examine LyE in a limb-loss population. Their study examined the LyE in a group of eight individuals with a unilateral, transfemoral amputation.…”

Section: Lyapunov Exponent: Another Tool In Limb-loss Rehabilitationmentioning

confidence: 99%

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

Wurdeman

Myers

Jacobsen³

et al. 2013

JRRD

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“…Use of a prosthesis may promote independence in activities that incorporate the lower limb (e.g., postural transitions, locomotion), but prominent deficits remain. Standing balance [12], level-ground walking [13][14][15][16][17][18], stair ascent and descent [19][20][21], hill ascent and descent [22], negotiation of uneven terrain [14], standing from and sitting in a chair [23], and obstacle avoidance [24] have been reported to be significantly impaired in persons with TFA compared to nondisabled control subjects. Documented limitations typically relate to the capacity of prosthetic users to engage in specified activities compared with those without amputation in controlled laboratory environments.…”

Section: Introductionmentioning

confidence: 99%

Long-term activity in and among persons with transfemoral amputation

Halsne¹,

Waddingham²,

Hafner³

2013

JRRD

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Abstract-Although physical limitations associated with transfemoral amputation (TFA) have been studied in laboratory settings, little is known about habitual activity within free-living environments. A retrospective analysis of 12 mo of step activity data was performed to quantify activity levels, variations, and patterns in 17 adults with unilateral TFA. Yearly, seasonal, and monthly average daily step counts and coefficients of variation (CoVs) were examined to characterize mobility. Analysis by Medicare Functional Classification Level (MFCL) was performed to explore relationships between clinical classification and performance. Subjects averaged 1,540 prosthetic steps/day, and activity generally increased with MFCL. Activity between MFCL-2 and -3 subjects was not significantly different, suggesting that ability to engage in habitual physical activity may be similar for these groups. Relative variation (CoV) was 0.65 across subjects but was lower for those with higher activity levels. No significant differences in CoV by group were detected. Marked seasonal and monthly patterns in activity were identified. Warmer seasons and months generally promoted higher activity, but peak temperatures and humidity depressed activity. Results suggest that persons with TFA are greatly limited in regards to activity. Further, large variations within and between subjects may challenge the interpretation of step activity gathered over short periods of time.

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“…This greater variability for GMED suggests greater variability in control of mediolateral movements. A study of individuals with TFA with socket prostheses reported increased variability in mediolateral trunk acceleration [57].…”

Section: Surface Electromyographymentioning

confidence: 98%

Muscle activity during stance phase of walking: Comparison of males with transfemoral amputation with osseointegrated fixations to nondisabled male volunteers

Pantall¹,

Ewins²

2013

JRRD

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Abstract-A recent development in prosthetics is the osseointegrated fixation (OF), with improvements in comfort, fatigue, hip movement, and ease of prosthetic attachment reported. However, little information is available regarding muscle function. This study reports on selected gait parameters of the residual limb during the stance phase of level overground walking, focusing on muscle activity. Five males with transfemoral amputation (TFA) with OFs were recruited. Ground reaction force (GRF), lower-limb kinematics, and surface electromyography (sEMG) from residual-limb muscles were recorded. sEMG data were also collected from a group of 10 nondisabled male subjects. Interstance variability of gait parameters was assessed by coefficient of multiple correlations. Repeatability of GRF and hip kinematics was high, whereas repeatability of the sEMG was low for four of the five individuals with TFA. Interstance variability of the sEMG for gluteus medius (GMED) was significantly greater in the group with TFA. The main difference in sEMG between the groups was the phase, with GMED and adductor magnus displaying greater differences than their counterparts in the nondisabled group. Results demonstrate that muscles in the residual limb retain aspects of their previous functional pattern.

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Variability and stability analysis of walking of transfemoral amputees

Cited by 142 publications

References 43 publications

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

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

Long-term activity in and among persons with transfemoral amputation

Muscle activity during stance phase of walking: Comparison of males with transfemoral amputation with osseointegrated fixations to nondisabled male volunteers

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