Abstract
Abstract Disclosure: S. Bjornsdottir: None. W. Kamal: None. B.L. Langdahl: None. T. Spelman: None. B.L. Clarke: None. O. Kampe: None. Context: Previous studies have shown that patients with hypoparathyroidism (hypoPT) have reduced bone remodeling, with consequent increases in bone density, and abnormalities in microarchitecture and bone strength. It is still not clear whether there is an increased risk of fractures in patients with hypoPT. Objective: The aim of this study was to evaluate the risk of fractures in patients with hypoPT in Sweden. Patients: The Swedish National Patient Register, the Swedish Prescribed Drug Register and the Total Population Register were used to identify 1982 patients with chronic hypoPT (duration ≥ 12 months), and 19820 controls matched by age, sex and county of residency between 1997-2018. The 10th revision of the International Classification of Diseases (ICD) was used to identify fractures. Results: Patients with hypoPT did not have higher risk of any fracture compared to controls (HR 0.96; 95% CI 0.86-1.08). However, patients with hypoPT had a slightly higher risk of vertebral fractures (HR 1.33; 95% CI 1.01-1.75), p= 0.047 and a lower risk of femoral fractures (HR 0.60; 95% CI 0.45-0.82), p= 0.001. There was no significant difference in the risk of fractures of the forearm, p= 0.177, proximal humerus, p= 0.096 or pelvis, p= 0.446. There was no difference in the risk of any fracture between females and males with hypoPT (p for interaction= 0.511). Patients with surgical hypoPT had a significantly higher risk of any fracture compared with patients with non-surgical hypoPT (p for interaction= 0.006). Conclusion: The risk of any fracture was not increased in patients with hypoPT. However, the risk of vertebral fracture was increased, and the risk of femoral fracture was lower than for matched controls. No difference was found in fracture risk between females and males. Patients with surgical hypoPT had a higher fracture risk compared to patients with non-surgical hypoPT. Presentation: Saturday, June 17, 2023
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