Trends and epidemiology of lower trunk fractures in the super elderly population in the United States from 2011 to 2020

Introduction: Fractures of the lower trunk are among the most common fractures occurring in the elderly. Super elderly individuals (i.e., those 80 years of age and older) represent a growing segment of the population and are especially prone to these fractures. The contemporary epidemiology of lower trunk fractures in the super elderly population is incompletely described in the literature. Materials and Methods: This descriptive epidemiology study used the National Electronic Injury Surveillance System (NEISS) to examine the incidence and recent trends of lower trunk fractures (i.e., fractures of the hip, pelvis, and lumbar spine) occurring among super elderly individuals in the United States (US) from 2011 to 2020. Annual, overall, and age-/sex-specific incidence rates (IRs) were analyzed. Average annual percent change (AAPC) estimates were calculated to indicate the magnitude/direction of trends in annual injury rates. Results: An estimated N=1,226,160 =1,226,160 super elderly patients sustained lower trunk fractures over the 10-year study period for an overall IR of 100.2 per 10,000 person-years at-risk (PYR). Hip fractures accounted for the largest percentage of cases (IR=71.7 =71.7 PYR), followed by lumbar spine fractures (IR=14.7), =14.7), and pelvic fractures (IR=14.3). =14.3). The incidence of lower trunk fractures among super elderly females (IR=121.5 =121.5 PYR) was significantly greater than that of males (IR=65.7 =65.7 PYR). The incidence of lower trunk fractures among nonagenarians and centenarians was significantly higher than that of octogenarians. Accounting for population growth yielded a significantly increasing annual incidence of lower trunk fractures in super elderly patients over the study period from 86.7 PYR in 2011 to 107.2 PYR in 2020 (AAPC=2.7, =2.7, p<0.001). The annual incidence of both pelvic (AAPC=5.8) =5.8) and lumbar spine (AAPC=6.9) =6.9) fractures increased at a significantly higher rate than that of hip fractures (AAPC=1.4). =1.4). Conclusions: This study suggests that the annual incidence of lower trunk fractures in the oldest cohort of patients in the US (80+ + years of age) increased significantly during the recent decade from 2011 to 2020, with pelvic and lumbar fractures in particular becoming increasingly common. Increased incidence rates highlight the need for future research aimed at optimizing outcomes and quality of life in this frail and ever-growing segment of the population.