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Foot volume estimates based on a geometric algorithm in comparison to water displacement
H N Mayrovitz1, N Sims, B Litwin
1Department of Physiology, College of Medical Sciences, Nova Southeastern University, Ft. Lauderdale, Florida 33328, USA. mayrovit@nova.edu
Lymphology
|April 29, 2005
Summary
A new metric method using calipers and rulers accurately estimates foot volume, crucial for lymphedema therapy assessment. This practical approach provides a reliable alternative to water displacement for tracking treatment progress.
Area of Science:
- Clinical Measurement
- Lymphedema Therapy Assessment
- Lower Extremity Edema Quantification
Background:
- Accurate assessment of lower extremity limb volume is vital for evaluating lymphedema therapy effectiveness.
- Current methods for leg volume assessment are established, but a reliable metric for foot volume is lacking.
- Excluding foot volume can lead to inaccurate estimations of therapeutic progress in lymphedema patients.
Purpose of the Study:
- To develop and validate a practical metric measurement procedure and algorithm for estimating foot volumes.
- To provide practicing therapists with a tool to routinely assess foot volumes in lymphedema patients.
- To compare the accuracy of the new metric method against water displacement for foot volume measurement.
Main Methods:
- A novel metric method utilizing calipers and rulers to measure standardized foot dimensions was developed.
- A mathematical algorithm was created to calculate estimated foot volume (VM) from these measurements.
- Foot volumes measured by the new method (VM) were compared to those obtained by water displacement (Vw) in 30 subjects (60 feet).
Main Results:
- The mean foot volumes measured by water displacement (Vw) and the metric method (VM) were highly similar (857 ± 150 ml vs. 859 ± 154 ml).
- A strong correlation was found between the two methods (VM = 1.00Vw + 1.67 ml, r = 0.965, p < 0.001).
- Limits of agreement analysis showed acceptable differences, with absolute volume differences of ±79.6 ml and percentage differences of ±9.28%.
Conclusions:
- The developed metric measurement procedure and algorithm provide a valid and reliable method for estimating foot volumes.
- This technique serves as a practical and useful alternative to water displacement for foot volume assessment in clinical settings.
- The method is suitable for use when water displacement is impractical, unavailable, or contraindicated, aiding in accurate lymphedema therapy monitoring.