Postural Responses to Dynamic Perturbations in Amputee Fallers Versus Nonfallers: A Comparative Study With Able-Bodied Subjects Natalie Vanicek, MSc,

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Presentation transcript:

Postural Responses to Dynamic Perturbations in Amputee Fallers Versus Nonfallers: A Comparative Study With Able-Bodied Subjects Natalie Vanicek, MSc, Siobhan Strike, PhD, Lars McNaughton, PhD, Remco Polman, PhD Archives of Physical Medicine and Rehabilitation Volume 90, Issue 6, Pages 1018-1025 (June 2009) DOI: 10.1016/j.apmr.2008.12.024 Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 1 SOT 6 conditions. (Courtesy of NeuroCom International Inc.) Archives of Physical Medicine and Rehabilitation 2009 90, 1018-1025DOI: (10.1016/j.apmr.2008.12.024) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 2 Relative equilibrium scores for the SOT. Positive scores indicate the absolute equilibrium score was greater than the age-matched, normative data, suggesting overall good balance. Abbreviations: AMP_F, amputee fallers; AMP_NF, amputee nonfallers; CON_F, control fallers; CON_NF, control nonfallers. *Significant difference between amputee fallers and nonfallers. Archives of Physical Medicine and Rehabilitation 2009 90, 1018-1025DOI: (10.1016/j.apmr.2008.12.024) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 3 Strategy scores for the SOT. Scores approaching 100 indicate predominant use of the ankle strategy, whereas low scores near 0 indicate total hip strategy. Scores in between indicate use of both ankle and hip strategies. Abbreviations: AMP_F, amputee fallers; AMP_NF, amputee nonfallers; CON_F, control fallers; CON_NF, control nonfallers. *Significant difference between control fallers and nonfallers. Archives of Physical Medicine and Rehabilitation 2009 90, 1018-1025DOI: (10.1016/j.apmr.2008.12.024) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 4 Mean ± SD response latency (ms) for the MCT. Positive values indicate the response latency was faster and negative values indicate the response latency was slower than the age-matched normative data. Abbreviations: AMP_F, amputee fallers; AMP_NF, amputee nonfallers; CON_F, control fallers; CON_NF, control nonfallers. Archives of Physical Medicine and Rehabilitation 2009 90, 1018-1025DOI: (10.1016/j.apmr.2008.12.024) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 5 Weight symmetry during medium and large backwards and forwards translation for the (A) amputee and (B) control groups. Black squares (■) represent nonfallers; gray squares (▤) represent fallers. A response strength of 0% indicates perfect symmetry between the 2 limbs. For the amputees, negative values indicate greater intact limb and positive values indicate greater prosthetic limb response strength. *Significant difference between amputee fallers and nonfallers. Archives of Physical Medicine and Rehabilitation 2009 90, 1018-1025DOI: (10.1016/j.apmr.2008.12.024) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions