What This Means
This research suggests that older adults who have undergone more surgeries over their lifetime tend to have lower total bone mass compared to those with fewer surgeries. The study analyzed data from 327 adults with an average age of about 64.5 years, using precise body composition measurements from bone density scans (DXA). After accounting for many other factors like age, sex, body weight, blood sugar, cholesterol, smoking, diet, medications, and physical activity, researchers still found that each additional surgery was statistically linked to reduced bone mass. This relationship appeared even stronger when looking specifically at people who had undergone multiple major surgeries.
Interestingly, the number of surgeries was not associated with muscle mass (lean mass), suggesting that the musculoskeletal effects of cumulative surgery may be more specific to bone tissue than to muscle. Separately, the study found that healthier eating habits were linked to greater muscle mass but not to bone mass, pointing to different pathways influencing these two aspects of body composition.
This research matters because bone loss in older adults is a major contributor to fracture risk and reduced quality of life. If repeated surgical procedures contribute to bone loss over a lifetime, this could be an important and underappreciated risk factor for osteoporosis and related complications in aging populations. However, the authors caution that because this was a cross-sectional (snapshot-in-time) study, it cannot prove that surgeries directly cause bone loss — people who have had more surgeries may also have more underlying health conditions that independently affect bone health. The authors call for future longitudinal studies to better untangle these relationships.