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Categories: Abstracts, 2018, Podium

Simulated weight reduction with an anti-gravity treadmill: a pilot study to assess pain reduction in foot and ankle arthritis

W. Morley, E. Dawe, R. Boyd, J. Creasy, J. Grice, D. Marsland, H. Taylor

1Royal Bournemouth and Christchurch Hospitals NHS Foundation Trust, Bournemouth, United Kingdom

2St Richard's Hospital, Chichester, United Kingdom

3Great Western Hospital, Swindon, United Kingdom

4Royal Hampshire County Hospital, Winchester, United Kingdom 

Winner of the BOFAS 2018 First Prize (Podium)

Introduction: Osteoarthritis in the foot and ankle affects approximately 30,000 patients annually in the UK. Evidence has shown that excess weight exacerbates foot pain, with significant increases in joint forces. However, despite the current trend for Clinical Commissioning Groups to ration surgery for obese patients, studies have not yet determined the effect of weight loss in obese patients with foot and ankle arthritis.

Aim: Pilot study to investigate the effect of simulated weight loss on pain scores in obese patients with symptomatic foot and ankle arthritis.

Methods: Following ethical approval, a prospective study of 17 obese patients (mean BMI 39.2, range 31.2 - 50.3) with foot and ankle arthritis was undertaken (BOFAS funded). Under physiotherapist supervision, patients walked for one minute on an anti-gravity treadmill, which allowed simulated weight reduction. Following baseline assessment, reduced BMI was simulated, starting at 20, rising in increments of 5, until each patient's usual BMI was reached. Pain was assessed using a Visual Analogue Scale (VAS). Repeated measures ANOVA was used to assess for significant changes in pain, comparing baseline with each simulated BMI category (significance set at p< 0.05).

Results: Simulated weight loss caused a significant reduction in pain (p=0.005, power 0.91). Mean VAS pain scores improved by 24% (p=0.003) and 17% (p=0.040) for BMI categories 20 and 25, compared with baseline. Pain scores were not significantly different comparing BMI categories of 25 and 20.

Conclusion: Simulated weight loss to normal BMI significantly decreased pain in obese patients with foot and ankle arthritis. The use of the anti-gravity treadmill to demonstrate the feeling of normal BMI has also provided motivation to several patients to lose weight. The current study could be used to power future studies to investigate the effects of weight loss in foot and ankle patients.

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