INCREASED MORTALITY IN HIP FRACTURE PATIENTS – A CASE-CONTROL STUDY OF 1029 HIP FRACTURE PATIENTS OVER 20 YEARS

Abstract

Aim: We have previously shown that long-term survival after hip fracture is highly dependent on age at the time of fracture and that fracture risk is similarly age-dependent. It has been suggested that the excess mortality occurs mainly during the first years after fracture, while mortality in a remaining life-time perspective is not well studied. The aim of this study was to evaluate short- and long-term mortality in relation to cause of death in a cohort of patients with hip fracture in comparison with the back-ground population.

Methods: All adult patients suffering a hip fracture due to low energy trauma 1984–1985 in Malmö, Sweden were identified; 1029 cases (766 women, 263 men). The cases were compared with two age- and gender matched controls from the same background population, all alive and living in the catchment area when the hip fracture occurred. Date of death and cause of death were available through the national database, EPIC. Cases and controls were followed until death or up to 22 years.

Results: The median survival was 4.4 yrs (+/− 0.2 [CI 95% 4.0–4.8]) in hip fracture patients and 7.7 yrs (+/− 0.2 [CI 95% 7.3–8.1]) in controls, equal to a median loss of 3.3 yrs. Mortality rate continued to be elevated for approximately 10 yrs, thereafter observed mortality approached expected mortality. Mean survival was 2.9 years shorter in fracture cases compared to controls (6.4 yrs (+/− 0.2 [CI 95% 6.0–6.8]) versus 9.4 yrs (+/− 0.2 [CI 95% 9.1–9.7])). Ischemic heart failure was the major underlying cause of death (25%) both among cases and controls.

Conclusion: In hip fracture patients, excess mortality is evident both in the short- and long-term with an increased risk beyond 10 yrs. Nevertheless, the major causes of death were similar to that of controls.