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Related Experiment Videos

Hand volume estimates based on a geometric algorithm in comparison to water displacement.

H N Mayrovitz1, N Sims, C J Hill

  • 1College of Medical Sciences, Nova Southeastern University, Ft Lauderdale, Florida 33328, USA. mayrovit@nova.edu

Lymphology
|August 17, 2006
PubMed
Summary

A new elliptical algorithm accurately estimates hand volumes using caliper measurements, offering a practical alternative to water displacement for lymphedema therapy monitoring.

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Area of Science:

  • Biomedical Engineering
  • Clinical Measurement
  • Lymphedema Research

Background:

  • Accurate assessment of upper extremity limb volume is crucial for lymphedema therapy efficacy.
  • Traditional tape measurements may be inaccurate for hand volume due to irregular hand shape.
  • A reliable, non-invasive method for hand volume estimation is needed.

Purpose of the Study:

  • To develop and validate a novel measurement procedure and algorithm for estimating hand volumes.
  • To provide a practical alternative to water displacement for routine clinical use.

Main Methods:

  • A caliper was used to measure hand width and depth in 33 subjects (66 hands).
  • Hand volumes were calculated using an elliptical frustum model (VE).
  • VE was compared to water displacement (VW), tape-measure circumference (VC), and trapezoidal model (VT) volumes using regression and LOA.

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Main Results:

  • The elliptical algorithm (VE) showed high correlation with water displacement (VW) (r=0.986), with minimal difference (VE = 1.01VW - 3.1 ml).
  • Limits of Agreement (LOA) for VE vs. VW were +/- 33.5 ml and +/- 9.9%.
  • Tape-measure (VC) and trapezoidal (VT) models significantly overestimated hand volumes (p<0.0001).

Conclusions:

  • The developed elliptical algorithm provides a reliable and accurate method for estimating hand volumes.
  • This method is a valuable alternative to water displacement, especially when the latter is impractical or contraindicated.
  • The algorithm facilitates routine clinical assessment of hand volume changes in lymphedema management.