Mathematical models in the evaluation of weight distribution asymmetry in lower limbs: Implication for practice

Senthil N S Kumar, Baharudin Omar, Ohnmar Htwe, Nor Hamdan Mohamad Yahaya, Ambusam Subramanium

Research output: Contribution to journalArticle

Abstract

Introduction: Mathematical models quantify asymmetry in weight distribution on bilateral lower limbs using indexes or ratios. Aim: This study investigates the efficacy of mathematical models to evaluate weight distribution asymmetry in healthy and different clinical populations. Material and methods: This cross-sectional study recruited 188 participants (149 healthy, 27 stroke and 12 unilateral total knee replacement) through convenience sampling for this study. Two digital weighing scales were used to capture the loading on bilateral lower limbs. The data is further computed with different mathematical models. Results and discussion: The symmetry index model has problems of inflation with increasing asymmetry values. Symmetry ratio model exhibits low sensitivity to differences in weight distribution, and did not provide the magnitude and direction of absolute weight distribution asymmetry. The direction of the asymmetry is not meaningful from the symmetry angle model, and it fails to predict factual asymmetry values. Conclusions: Modified symmetry index has better sensitivity to differences in bilateral lower limb weight distribution and is able to quantify the extent of asymmetries and identifies the side of asymmetry. Based on the study results, we suggest the application of the mathematical models to quantify limb loading in the following order: modified symmetry index, symmetry index, symmetry angle, and symmetry ratio for clinical or research practice.

Original languageEnglish
JournalPolish Annals of Medicine
DOIs
Publication statusAccepted/In press - 27 Apr 2016

Fingerprint

Lower Extremity
Theoretical Models
Weights and Measures
Knee Replacement Arthroplasties
Sampling Studies
Economic Inflation
Healthy Volunteers
Extremities
Cross-Sectional Studies
Stroke
Research
Population
Direction compound

Keywords

  • Asymmetry
  • Index
  • Limb loading
  • Mathematical model
  • Ratio

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Mathematical models in the evaluation of weight distribution asymmetry in lower limbs : Implication for practice. / Kumar, Senthil N S; Omar, Baharudin; Htwe, Ohnmar; Mohamad Yahaya, Nor Hamdan; Subramanium, Ambusam.

In: Polish Annals of Medicine, 27.04.2016.

Research output: Contribution to journalArticle

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