The risk of fractures is not high in obese patients who undergo bariatric surgery, an international study has found.

Generally, a higher Body Mass Index (BMI) protects the bone against most types of fracture because a higher BMI is associated with increased bone density. Additionally there is more protection around the bones.
Studies have shown that weight loss can lead to a reduction of bone density and specifically studies have suggested that bone density is lost after bariatric surgery; however no previous work has been able to investigate whether such changes might result in an increased risk of fracture relative to a control population.
Bariatric surgery, or weight-loss surgery, is used to treat people with potentially life-threatening obesity and that will not respond to non-surgical treatments. The most widely used forms of weight-loss surgery are gastric bypass or gastric band. Weight-loss surgery rates have been increasing over the years with the number of hospital procedures for weight-loss stomach surgery rising to 8,087 in 2010/11 – 12 per cent higher than in 2009/10 when there were 7,214.
During the study, Southampton researchers, together with colleagues at the University of Utrecht, Netherlands, and the Medicines and Healthcare products Regulatory Agency, London, compared the fracture rates of people who had had bariatric surgery between 1987 and 2010, with people who had not had the surgery but were matched by age, sex, body mass index, practice, and calendar year.
Results showed that compared to the control group, the overall risk of fracture was not significantly increased in bariatric surgery patients in the first few years post-operation, but there was a slight trend towards an increased fracture risk after three to five years. The researchers also found a slight tendency for fracture risk to increase with greater post-operative decrease in body mass index.
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Professor Cyrus Cooper, Director and Professor of Rheumatology, at the MRC LEU, adds: "With increasing numbers of obese individuals in the UK, bariatric surgery is becoming more common and has been associated with a reduction in bone density after the operation. This is the first time that we have been able to investigate risk of fracture following bariatric surgery by comparing patients with non-surgical controls. The results suggest that, at least in the short term, such changes in bone density are unlikely to lead to increased fracture risk."
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Source-Eurekalert