No increase in fracture incidence in patients treated for thyrotoxicosis in Malmo during 1970-74. A 20-year population-based follow-up

Objectives. To study whether there is an increased fracture incidence follo wing thyrotoxicosis. Design. A case-control study. Setting. Malmo University Hospital, Malmo, Sweden. Subjects: All patients (n = 333) from the population of Malmo who were trea ted for thyrotoxicosis for the first time during the 5-year period 1970-74. A total of 618 controls were selected from the local municipality registry in Malmo. For each case the aim was to randomly select two age- and gender -specific controls, alive in 1993 and born the same year and month as the c ase. Main outcome measures. Fracture incidence Results. Comparing survivors, there were no differences in the percentage o f individuals with fractures tall, fragility, non-fragility) between the pa tients and the controls. Comparing all individuals and including all fractu res, the percentage of individuals with fractures in the entire female pati ent group (24.6%) was lower (P < 0.05) than in female controls (33.1%). The re was a similar but non-significant pattern between male patients and cont rols. The mean number of all fractures was lower in male patients than in c ontrols (P < 0.05), but no significant difference was noted between female patients and controls. For fragility fractures, there were no significant d ifferences in the percentage of individuals with fractures or in the mean n umber of Fractures between female or male patients and controls. Conclusion. In conclusion we found no increased incidence of fragility frac tures in patients with previous thyrotoxicosis as compared with controls. O ur results do not support the suggestion that screening for osteoporosis sh ould be performed in patients with previous thyrotoxicosis.