Effects of weight loss on foot structure in obese adults: a pilot study
© Song et al; licensee BioMed Central Ltd. 2012
Published: 10 April 2012
Excessive body weight can have a profound influence on weight bearing structure and function, including pain, disability, and compromised quality of life. A prospective cohort study of 5,784 people over the age of 50 years, showed that obesity was a strong predictor of the onset of severe disabling knee pain. Similarly, increased weight was found to have an association with chronic plantar heel pain syndrome. No study to-date has conducted an objective prospective examination of the differences in foot structure and function during significant weight change.
Materials and methods
In this randomized controlled prospective pilot study, 41 obese subjects were randomly assigned to either the treatment or the control group. Subjects assigned to the treatment group received weekly education plus pre-packaged portion-controlled meals while the control group received monthly education only. Foot structure measurements (malleolar valgus index and arch height) were assessed at baseline and 3-month. Repeated ANOVA (Matched Pairs by Group) analysis was performance using JMP 9.
Summary of foot structure measures of the control and the treatment groups at baseline and 3-month
Body Mass Index a
Malleolar Valgus Index (%)
Standing arch height (cm)
Arch drop (cm)
No significant changes were noted in measured structural foot parameters at 3-month follow up between the two groups as a function of observed weight loss. It is not clear if a larger weight reduction would have yielded significant changes. Several foot dimensions (including standing arch height and arch height drop from the sitting to standing conditions) were linearly correlated with body weight.
Nutrisystem, Inc. provided the pre-packaged portion-controlled meals for the study.
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