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Logo for the Journal of Rehab R&D
Volume 41 Number 5, September/October 2004
Pages 683 — 694


Shape and volume change in the transtibial residuum over the short term: Preliminary investigation of six subjects

Santosh G. Zachariah, PhD; Rakesh Saxena, PhD; John R. Fergason, CPO; Joan E. Sanders, PhD

Departments of Bioengineering and Rehabilitation Medicine, University of Washington, Seattle, WA
Abstract — A preliminary investigation was conducted to characterize the magnitude and distribution of volume change in transtibial residua at two time intervals: upon prosthesis removal and at 2 week intervals. Six adult male unilateral transtibial amputee subjects, between 0.75 and 40.0 years since amputation, were imaged 10 times over a 35-minute interval with a custom residual limb optical scanner. Volume changes and shape changes over time were assessed. Measurements were repeated 2 weeks later. Volume increase on socket removal for the six subjects ranged from 2.4% to 10.9% (median 6.0% standard deviation 3.6%). Rate of volume increase was highest immediately upon socket removal and decreased with time (five subjects). In four subjects, 95% of the volume increase was reached within 8 minutes. No consistent proximal-to-distal differences were detected in limb cross-sectional area change over time. Limb volume differences 2 weeks apart ranged from -2.0% to 12.6% (0.6% 5.5%) and were less in magnitude than those within a session over the 35-minute interval (five subjects). Multiple mechanisms of fluid movement may be responsible for short-term volume changes, with different relative magnitudes and rates in different amputees.
Key words: amputation, anthropometry, artificial limbs, body surface area, diurnal, limb volume, residual limb, shape change.

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