Epidemiology of hip fractures in Zanjan, Iran

Abstract

SummaryThe aim of this study was to estimate the incidence of hip fracture in Zanjan, Iran and to describe its seasonal variation. A total of 244 cases of hip fractures (131 men, 113 women) were recorded during 1 year. The annual age-standardized incidence rates were 206.5 and 214.8 per 100,000 men and women, respectively. Most fractures occurred in winter, in-house and daytime. In-hospital mortality was 2.5%. Incidence rate of hip fracture (HF) was less than in western countries mostly due to lower incidence in women, which is probably because of breast-feeding.IntroductionOne of the most important consequences of osteoporosis is HF, which causes high mortality, morbidity, and significant costs. The incidence of HF in the elderly varies in different areas. Various incidence rates of HF have been reported from countries in the Middle East. The aim of this prospective study was to estimate the annual incidence of hip fracture in Zanjan, a province of Iran, and to describe the seasonal variation of HF incidence which has not been evaluated in two previous studies conducted in this country.Materials and methodsAll cases of HF aged 50 years or more admitted in three referral hospitals with orthopedics facilities in Zanjan province between 21 March 2006 and 20 March 2007 were subjected in the study. The age- and sex-specific incidence rates of hip fracture per 100,000 person-years were calculated using the population data from the last national census in Iran 2007.ResultsA total of 244 cases of hip fractures (131 men, 113 women) were recorded. The annual age-standardized incidence rate was 214.8 per 100,000 women and 206.5 per 100,000 men. The number (%) of fall-induced HF was 88 (67.2%) in men and 102 (90.3%) in women. The female to male ratio for total and fall-related HF was 1.0 and 1.1, respectively. The HF was more predominant in winter (38.5%). In-hospital mortality was 2.5%, and majority of HF were sustained in-house and daytime.ConclusionWe found a relatively low incidence of hip fracture and fall-related hip fracture in Iran than those in western countries, which is mostly due to the lower rate in women. These findings disagree with our expectations considering the bone mineral density and vitamin D status of Iranian population, especially women. Breastfeeding could be one of the probable protective factors.

Does Mobility of the Elderly with Hip Fractures Improve at One Year Following Surgery? A 5-year Prospective Survey

“…Interestingly, the distribution of hip fractures in different seasons of the year was almost equal in the current study. This is contrary to other studies, which described increased incidence of hip fractures in the winter season [8,11,17]. A probable cause is the moderate climate of Shiraz without very cold and heavy snow in winters; therefore, the incidence of falls among the elderly in the winter and other seasons is similar in this region.…”

“…Distributions of hip fracture and related risk factors vary among different regions of the world. Incidence and other epidemiologic data regarding hip fractures in different parts of Iran have been well described [6][7][8][9][10][11][12][13]. By comparing the incidence rate of hip fractures in studies by Soveid et al in 2005 andMaharlouei et al in 2014, it becomes clear that hip fractures in this region have been increasing in recent years [6,7].…”

Mortality after low trauma hip fracture: a prospective cohort study

“…In our previous study, the female to male ratio of hip fracture for Iranian habitants in Zanjan province was 1.0 or less in almost all age-groups which is lower than that was reported in most western countries but it is similar to the low incidence rate of hip fracture areas in Asia such as rural areas in Turkey and Beijing, China [29,30]. The complete etiology of HF in this area is not well understood.…”

Hip fracture incidence in Lebanon: a national registry-based study with reference to standardized rates worldwide

“…Studies have varied in their methodology employed to determine hip fractures. While most have included, in the identifications of hip fractures, fractures of the femoral neck, trochanter, intertrochanter, and subtrochanteric area, similar to the definition used in the Lebanese study, few have excluded subtrochanteric fractures, and two studies left that determination unclear [10,15,17,18,20,24,34]. Subtrochanteric fractures, nevertheless, constitute a minority of the total number of hip fractures [19,27].…”