title: Parathyroid surgery is associated with a decreased risk of hip and upper arm fractures in primary hyperparathyroidism: a controlled cohort study.
abstract: OBJECTIVE
  To study if parathyroid surgery reduced fracture risk in patients with primary hyperparathyroidism.
  
  
  METHODS
  Controlled cohort study.
  
  
  METHODS
  All subjects diagnosed with primary hyperparathyroidism (ICD8 codes: 252.00, 252.01, 252.03, 252.04, 252.05, 252.08, 252.09, and ICD10 codes: E21.0, E21.2, E21.3) between 1980 and 1999 in Denmark were retrieved from the National Hospital Discharge System.
  
  
  METHODS
  A total of 3213 subjects (mean age at diagnosis 60.9 +/- 16.3 years) were identified of whom 1934 (60%) had parathyroid surgery whilst 1279 (40%) did not. Total follow-up time after diagnosis was 19.565 (median 6.1) years.
  
  
  METHODS
  Fracture occurrence after diagnosis was identified from the National Hospital Discharge System.
  
  
  RESULTS
  Conservatively treated patients were older than surgically treated at diagnosis (64.2 +/- 17.4 years vs. 58.3 +/- 15.2 years, P < 0.01). The mean serum calcium was 2.95 mmol L-1 in surgically treated and 2.74 in conservatively treated in a subgroup from one centre, n = 687). At the time of diagnosis, 172 (9%) of the subsequently surgically treated had had any fracture whilst the same was the case for 176 (14%) of the conservatively treated (P < 0.05). Parathyroid surgery reduced the risk of hip (HR = 0.44, 95% CI: 0.32-0.62) and upper arm (HR = 0.44, 95% CI: 0.27-0.72) fractures after diagnosis whilst the occurrence of other fracture types remained unchanged.
  
  
  CONCLUSIONS
  Parathyroid surgery reduces the occurrence of hip and upper arm fractures with approximately 50% in patients with primary hyperparathyroidism. This may advocate surgery in patients with primary hyperparathyroidism with serum calcium levels in the range presented here. Further studies in patients with mild disease are warranted.
authors.affiliation: Department of Endocrinology and Metabolism Clinic, Aarhus Amtssygehus, Aarhus University Hospital, Aarhus, Denmark. p-vest@post4.tele.dk
authors.forename: P
authors.initials: P
authors.lastname: Vestergaard
authors.forename: L
authors.initials: L
authors.lastname: Mosekilde
mesh_terms: D000368:Aged; D001134:Arm Injuries / Q000453:epidemiology / Q000209:etiology*; D015331:Cohort Studies; D005260:Female; D050723:Fractures, Bone / Q000453:epidemiology / Q000209:etiology*; D006620:Hip Fractures / Q000453:epidemiology / Q000209:etiology; D006801:Humans; D006961:Hyperparathyroidism / Q000175:diagnosis / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D010280:Parathyroid Glands / Q000601:surgery*; D015995:Prevalence; D012008:Recurrence; D012307:Risk Factors; D012737:Sex Factors