Understanding dynamic stability from pelvis accelerometer data and the relationship to balance and mobility in transtibial amputees.
Study Goal
The researchers aimed to determine if pelvis acceleration-derived parameters could differentiate between dynamic stability states for transtibial amputees during level and uneven ground walking and correlate these parameters with clinical balance and mobility measures.
Results Summary
Seven of 26 pelvis acceleration measures significantly differed between level and uneven ground walking, with medial-lateral acceleration range being the most frequent predictor in regression models. Uneven ground walking provided the most relevant data for balance and mobility assessment, explaining up to 100% of variability in clinical measures.
Population
Eleven individuals with unilateral transtibial amputation.
Effective Dosage
Not applicable (no dosage mentioned).
Duration
Not specified (single walking session implied).
Interactions
None mentioned.
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
UG walking | increase | balance and mobility assessment | transtibial amputees | - | provided the most relevant data | #1 |
pelvis acceleration-derived parameters | no change | LG and UG walking | transtibial amputees | - | were able to differentiate between | #2 |
seven distinct, stability-relevant measures | no change | correlated accelerometer-derived measures to Berg Balance Scale (BBS), Community Balance and Mobility Scale (CBMS), and Prosthesis Evaluation Questionnaire (PEQ) scores | transtibial amputees | - | appeared in at least one of the six regression models | #3 |
seven distinct, stability-relevant measures | increase | variability in these measures | transtibial amputees | 100% | explaining up to | #4 |
medial-lateral acceleration range | increase | appearing in four models | transtibial amputees | - | was the most frequent model variable | #5 |
anterior-posterior acceleration standard deviation and stride time | increase | three models | transtibial amputees | - | appeared in | #6 |
seven pelvis acceleration measures | no change | between LG and UG walking conditions | transtibial amputees | - | had a significant difference | #7 |
This study investigated whether pelvis acceleration-derived parameters can differentiate between dynamic stability states for transtibial amputees during level (LG) and uneven ground (UG) walking. Correlations between these parameters and clinical balance and mobility measures were also investigated. A convenience sample of eleven individuals with unilateral transtibial amputation walked on LG and simulated UG while pelvis acceleration data were collected at 100Hz. Descriptive statistics, Fast Fourier Transform, ratio of even to odd harmonics, and maximum Lyapunov exponent measures were derived from acceleration data. Of the 26 pelvis acceleration measures, seven had a significant difference (p≤0.05) between LG and UG walking conditions. Seven distinct, stability-relevant measures appeared in at least one of the six regression models that correlated accelerometer-derived measures to Berg Balance Scale (BBS), Community Balance and Mobility Scale (CBMS), and Prosthesis Evaluation Questionnaire (PEQ) scores, explaining up to 100% of the variability in these measures. Of these seven measures, medial-lateral acceleration range was the most frequent model variable, appearing in four models. Anterior-posterior acceleration standard deviation and stride time appeared in three models. Pelvis acceleration-derived parameters were able to differentiate between LG and UG walking for transtibial amputees. UG walking provided the most relevant data for balance and mobility assessment. These results could translate to point of patient contact assessments using a wearable system such as a smartbelt or accelerometer-equipped smartphone.