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Journal of Bone and Joint Surgery - British Volume, Vol 90-B, Issue 3, 360-363.
doi: 10.1302/0301-620X.90B3.19782  
Copyright © 2008 by British Editorial Society of Bone and Joint Surgery
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The relationship between obesity and the age at which hip and knee replacement is undertaken

M. Changulani, MS, MRCS, Specialist Registrar1; Y. Kalairajah, MPhil, FRCS(Orth), Consultant Orthopaedic Surgeon2; T. Peel, BSc(Hons), Research Assistant3; and R. E. Field, PhD, FRCS(Orth), Consultant Orthopaedic Surgeon, Director of Research Orthopaedic Research Unit3

1 William Harvey Hospital, Kennington Road, Willesborough, Ashford, Kent TN24 0LZ, UK.
2 Luton and Dunstable Hospital NHS Trust, Lewsey Road, Luton LU4 0DZ, UK.
3 South West London Elective Orthopaedic Centre, Dorking Road, Epsom KT18 7EG, UK.

Correspondence should be sent to Dr M. Changulani; e-mail: changulani8{at}aol.com

We audited the relationship between obesity and the age at which hip and knee replacement was undertaken at our centre. The database was analysed for age, the Oxford hip or knee score and the body mass index (BMI) at the time of surgery. In total, 1369 patients were studied, 1025 treated by hip replacement and 344 by knee replacement. The patients were divided into five groups based on their BMI (normal, overweight, moderately obese, severely obese and morbidly obese).

The difference in the mean Oxford score at surgery was not statistically significant between the groups (p > 0.05). For those undergoing hip replacement, the mean age of the morbidly obese patients was ten years less than that of those with a normal BMI. For those treated by knee replacement, the difference was 13 years. The age at surgery fell significantly for those with a BMI > 35 kg/m2 for both hip and knee replacement (p > 0.05). This association was stronger for patients treated by knee than by hip replacement.






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Registered charity no: 209299     Print ISSN: 0301-620X
Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General