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Amputee socks: Sock thickness changes with normal use.

John C Cagle1, Krittika J D'Silva1, Brian J Hafner1

  • 1University of Washington, Seattle, WA, USA.

Prosthetics and Orthotics International
|March 4, 2015
PubMed
Summary
This summary is machine-generated.

Prosthetic sock thickness significantly decreases with use, losing 25% of its initial thickness within the first month. This change impacts volume accommodation and socket fit for prosthetic users.

Keywords:
Prosthetic sockslimb managementprosthetic fitvolume accommodation

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Area of Science:

  • Prosthetics and Orthotics
  • Biomechanical Engineering
  • Materials Science

Background:

  • Prosthetic socks are essential components for prosthetic limb users, providing cushioning and volume management.
  • Normal use leads to a reduction in prosthetic sock thickness and volume accommodation, but the extent of this change over time is not well-documented.

Purpose of the Study:

  • To investigate the correlation between the age of prosthetic socks and their change in thickness.
  • To quantify the impact of time and use on sock thickness under standardized conditions.

Main Methods:

  • Experimental mechanical assessment of used prosthetic socks donated by individuals with transtibial amputations.
  • Measurement of sock thickness using a custom instrument under simulated weight-bearing and non-weight-bearing conditions.
  • Comparison of stress-thickness response between new and used socks to evaluate performance degradation.

Main Results:

  • Prosthetic sock thickness decreases non-linearly with age.
  • After one month of use, socks retained approximately 75% of their initial thickness, with minimal further reduction for older socks.
  • Sock elasticity remained unchanged with age, indicating thickness reduction is the primary change.

Conclusions:

  • The age and ply count of used prosthetic socks do not reliably predict their volume accommodation.
  • Direct measurement of prosthetic sock thickness is crucial for accurately assessing prosthetic users' socket fit.
  • Quantifying sock thickness changes can guide recommendations for volume accommodation and socket adjustments.