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BMJ 2011; 342 doi: (Published 29 March 2011) Cite this as: BMJ 2011;342:d1908

Despite what we are usually told, being morbidly obese does not seem to affect postoperative outcomes after total hip replacement (except for a marginally increased rate of infection). Over 3000 patients who had hip replacement surgery were stratified into categories of body mass index and followed up for two years. Those classified as morbidly obese had changes in outcome scores that suggested improvement was equal to, if not greater than, that in the non-morbidly obese patients. Withholding surgery on the basis of body mass index is not justified, say the researchers (Journal of Bone and Joint Surgery (Br) 2011;93B:321-5, doi:10.1302/0301-620X.93B3.25876).

Anaemia and vitamin D deficiency both cause serious problems and increase with age. Researchers used data from the Third National Health and Nutrition Examination Survey to analyse the relation between the two conditions in elderly people and found the prevalence of vitamin D deficiency was 33.3% in the non-anaemic population, 56% in those with anaemia …

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