Use of Anti-Osteoporosis Medication Dispensing by Patients with Hip Fracture: Could We Do Better?

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Use of Anti-Osteoporosis Medication Dispensing by Patients with Hip Fracture: Could We Do Better? Osteoporosis International (2019) 30:1817–1825 https://doi.org/10.1007/s00198-019-05066-8 ORIGINAL ARTICLE Use of anti-osteoporosis medication dispensing by patients with hip fracture: could we do better? P. K. Kristensen1,2 & V. Ehrenstein1 & N. Shetty1,3 & A. B. Pedersen1 Received: 4 February 2019 /Accepted: 19 June 2019 /Published online: 29 June 2019 # International Osteoporosis Foundation and National Osteoporosis Foundation 2019 Abstract Summary Although Scandinavian countries have the highest incidence of hip fracture in the world, trends in anti-osteoporosis medication use have not been studied. We found less than one-third of Danish hip fracture patients had dispensing of anti- osteoporosis medication over a 10-year period using routinely collected data from population-based registries. Introduction To examine trend in dispensing of anti-osteoporosis medication before and after hip fracture surgery in Denmark over a 10-year period using routinely collected data from population-based registries. Methods From the Danish Multidisciplinary Hip Fracture Registry, we included 65,011 patients aged 65 years or older with an incident hip fracture in 2005–2015. We calculated, for each calendar year of hip fracture diagnosis, the prevalence of use of anti- osteoporosis medication (at least one dispensing of bisphosphonates, strontium ranelate, denosumab, selective estrogen receptor modulators, or teriparatide) in the year before and in the year following hip fracture diagnosis. Among those without a dispensing in the year before hip fracture, we computed 1-year cumulative incidence of use following hip fracture. We treated death as a competing risk and stratified the analysis on sex, age, and comorbidity. Results The prevalence of use before hip fracture varied between 7 and 12%, increasing slightly from 2005 to 2015. The cumulative incidence of use following hip fracture decreased from 16% in 2005 to 13% in 2010, whereupon it increased to 20%. A similar pattern was seen with each stratum of sex, age groups, and comorbidity. The overall prevalence of use after hip fracture was below 22% in all calendar years. Conclusions Less than one-third of hip fracture patients had dispensing of anti-osteoporosis medication up to 1 year after hip fracture. We observed only a slight increase in dispensing after hip fracture over the study period, irrespective of patient sex, age, and comorbidity at the time of hip fracture. Keywords Anti-osteoporosis medication . Bisphosphonates . Electronic supplementary material The online version of this article Hip fracture . Osteoporosis . Trend (https://doi.org/10.1007/s00198-019-05066-8) contains supplementary material, which is available to authorized users. * P. K. Kristensen Introduction [email protected]; [email protected] Osteoporosis affects over 200 million people worldwide [1], V. E hre ns te in [email protected] manifesting as nearly 9 million fractures, including fractures in the hip, spine, and distal forearm [2]. Sustaining a hip frac- N. Shetty ture more than triples the risk of a subsequent fracture, with [email protected] the highest risk concentrated within the first post-fracture year A. B. Pedersen [3–5]. Among patients with hip fracture, bisphosphonates are [email protected] an effective [6], but potentially underutilized, treatment for – 1 Department of Clinical Epidemiology, Aarhus University Hospital, secondary fracture prevention [7 13], with less than one- Olof Palmes Allé 43-45, DK-8200 Aarhus N, Denmark third of these patients receiving treatment [14, 15]. The 2008 ’ 2 Department of Orthopaedic Surgery, Horsens Regional Hospital, Guidelines of the UK s National Institute for Health and Sundvej 30, DK-8700 Horsens, Denmark Clinical Excellence (NICE) recommend the use of anti- 3 Department of Bioscience, Applied Marine Ecology and Modelling, osteoporosis medication including bisphosphonates, raloxi- Frederiksborgvej 399, building B1.18, 4000 Roskilde, Denmark fene, teriparatide, or strontium ranelate for secondary fracture 1818 Osteoporos Int (2019) 30:1817–1825 prevention for all hip fracture patients [16]. In September National Health Services Prescription Database (outpatient 2018, the American Society for Bone and Mineral Research dispensing) [29]. recommended that people above 65 years who have a hip or spine fracture should be treated for osteoporosis [17]. Anti-osteoporosis medication dispensing Following publication of the NICE guidelines, studies inves- tigating the period up to 2013 have shown an increase in Anti-osteoporosis medication use was defined as at least initiation of treatment for secondary prevention after hip frac- one dispensing of an anti-osteoporosis medication ture, especially among women older than 75 years [18, 19]. (bisphosphonates including combinations, strontium Nevertheless, the overall treatment initiation rates remained ranelate, denosumab, selective estrogen receptor modu- unchanged at 34% in 1999–2013 [19]. Data from the lators, or teriparatide). We identified all anti- Scandinavian countries on recent trends in utilization of anti- osteoporosis medication dispensing in the year before osteoporosis medication for secondary fracture prevention can hip fracture and in the year after hip fracture. be accessed in national country statistics [20], but have not Switching between different types of anti-osteoporosis been summarized in peer review publications, despite their medications was not considered treatment termination. world’s highest incidence of hip fracture (average age- We classified patients as users of anti-osteoporosis med- standardized annual rate is 346/100,000 in Denmark com- ications in the 12 months before and in the 12 months pared with 123/100,000 in Spain) [21, 22]. The Danish after hip fracture, defined as at least one dispensing in Ministry for Health has estimated that up to 70% of the hip the respective time window (Fig. 1). To characterize fracture patients may benefit from secondary fracture preven- utilization, we classified pre-fracture use as either con- tion through anti-osteoporosis medication [23]. Furthermore, sistent use or intermittent use. Consistent use was de- pre-fracture comorbidity is associated with an additional mor- fined based on at least one dispensing within each 6- tality risk [24, 25]. Therefore, it is relevant to examine anti- month time window 12 months before hip fracture or osteoporosis treatment both overallandinthecontextof based on a dispensing in the first time 6-month window existing comorbidity. that continued into the second 6-month time window, We examined time trends in dispensing of anti- based on the number of defined daily doses plus a 90- osteoporosis medications before and after hip fracture in day grace period. Intermittent users was defined as at Denmark, overall, and stratified for sex, age, and comorbidity. least one dispensing in only one of the two 6-month time windows in the 12 months before hip fracture or Methods if the days in the first period did not continue in the second period (Fig. 1). With respect to post-fracture use of anti-osteoporosis medications, we defined continuous We conducted this population-based descriptive cohort study use as any use both 12 months before and 12 months in Denmark, a country with 5.7 million inhabitants, with uni- after hip fracture. Incident use was defined among non- versal access to medical care including partial reimbursement users in the 12 months before hip fracture as use in the of prescription drug costs. 12 months after hip fracture. Study population and data sources Patient characteristics Patients were identified in the Danish Multidisciplinary Hip Fracture Registry, which is a nationwide population-based We describe the study population in terms of sex, age at hip clinical quality database, established in 2003 [26]. The data- fracture date (categories 65–74 years, 75–84 years, and base records all patients at age 65 years or older with hip 85 years or older), body mass index (BMI) (underweight fracture and contains detailed data on patient characteristics (BMI < 18.5 kg/m2), normal weight (BMI 18.5–24.9 kg/m2), and in-hospital performance indicators. We included patients overweight (25–29.9 kg/m2), and obese (≥ 30 kg/m2)), and with an incident hip fracture who underwent surgery with fracture type according to the criteria used at the Danish arthroplasty or internal fixationfrom2005to2015(n = Multidisciplinary Hip Fracture Registry (undisplaced femoral 65,011). Patients with a diagnosis of hip fracture between neck, displaced femoral neck, unspecified femoral neck, 2003 and 2005 were excluded. We set the date of hip fracture pertrochanteric and subtrochanteric). We also summarized surgery to indicate the date of hip fracture. To the study pop- the 10-year pre-fracture hospital comorbidity history using ulation, we linked data from the Danish Civil Registration the Charlson Comorbidity Index (CCI) [28]: a score of 0 System (personal identifier for linkage, migrations, and vital (low), given to patients with no previous record of diseases status) [27], the Danish National Patient Registry (inpatient included in the CCI; a score of 1–2 (medium); and a score of 3 and outpatient hospital diagnoses) [28], and the Danish or more (high). Osteoporos Int (2019) 30:1817–1825 1819 All paents with hip fracture surgery 2005-2015 N=80,760 Paents with a previous hip fracture within 10 years N=15,749 All paents with incident hip fracture surgery 2005-2015 N=65,011 One year before hip fracture surgery One year a er hip fracture surgery Non-users Non-users a er Users before hip Users a er hip before hip hip fracture fracture surgery fracture surgery fracture surgery surgery N=6,131 N=10,276 N=58,880 N=54,735 Intermient N=1,030 Intermient Connuous N=5,516 Consistent N=5,101 Consistent Iniators N=4,760 Fig. 1 Flowchart for inclusion Statistical analysis used in this study. The study was approved by the Danish Data Protection Agency (Aarhus University record number 2016- We tabulated the patients’ characteristics overall and by the 051-000001). Data analyses were performed using SAS ver- use of anti-osteoporosis medication before and after hip frac- sion 9.4.
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