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LIVERPOOL, ENGLAND – Osteoarthritis is associated with an increased risk in mortality, but three factors – inactivity, low mood, and cognitive ability – could be important targets to reduce this risk, according to the results of a study presented at the World Congress on Osteoarthritis.
“There’s recently been increasing interest in whether osteoarthritis (OA) is associated with mortality as the literature has failed to find a consistent link,” said Simran Parmar, a third-year medical student at Keele University, Newcastle-Under-Lyme, U.K.
Three years later, data from another study (BMJ. 2011;342:d1165) suggested an increased risk, with standardized mortality ratios calculated to be 1.55 for all-cause mortality and 1.71 for cardiovascular-specific mortality when comparing those with OA to those without OA in the general population.
However, more recent meta-analyses, performed in 2016, have failed to show a relationship between mortality and OA (Semin Arthritis Rheum. 2016;46[2]:160–7; Sci Rep. 2016;6:24393).
“This could be because of heterogeneity among the studies,” Mr. Parmar reasoned, adding that there was still an unclear relationship between OA and mortality.
So the aim of the current study was not only to take another look at the association to determine its strength but also to see what factors might be mediating the association in order to perhaps explain why OA might be associated with an increased risk of death.
The analysis used data on more than 8,000 individuals participating in the NorStOP (North Staffordshire Osteoarthritis Project). This is a large, population-based, prospective cohort initiated in 2002 that includes adults aged 50 years or older who are registered at any of six general practices.
At baseline, the mean age of participants was 65 years, 51% were female, and just under 30% had OA. During 10 years of follow-up, 1,188 (14.7%) participants died.
Osteoarthritis was significantly associated with mortality in both unadjusted and adjusted analyses.
“For the average person presenting to general practice in North Staffordshire, there’s a 39.4% increased risk of mortality if they have osteoarthritis compared to if they don’t,” Mr. Parmar said.
After adjustment for potential confounding factors, such as age, NSAID use, and common comorbidities, the increased mortality risk remained, with around a 15% increased risk of death for those with OA versus those without.
“We proposed six different mediators of this relationship,” Mr. Parmar said. These were depression, anxiety, low walking frequency, cognitive impairment, insomnia, and obesity. “The reason we chose these is because they can be targets for therapy in primary care.”
Three mediators significantly affected the relationship: low walking frequency, depression, and cognitive impairment; the respective hazard ratios and 95% confidence intervals were 1.12 (1.09-1.15), 1.11 (1.08-1.15), and 1.06 (1.03-1.09).
“This tells us that these could possibly be on the pathway between osteoarthritis and mortality, and this could provide further evidence that they could be used for targeted therapy of osteoarthritis,” Mr. Parmar suggested.
“This type of mediation analysis has not been done in the osteoarthritis field before,” Mr. Parmar observed. He conceded that the mediators found might actually have contributed to the development of OA and that pain interference used in the definition of OA could have been caused by other factors.
Nevertheless, these data suggest that there may be actionable factors that could be used in primary care to reduce mortality in OA.
Mr. Parmar suggested that “encouraging physical activity and considering the impact of comorbidities can help reduce the risk of mortality in adults with osteoarthritis.”
The study was funded by Arthritis Research UK, the North Staffordshire Primary Care Consortium, and the Medical Research Council. Mr. Parmar had no conflicts of interest to disclose.
SOURCE: Parmar S et al. Osteoarthritis Cartilage. 2018;26(1):S14-15.
LIVERPOOL, ENGLAND – Osteoarthritis is associated with an increased risk in mortality, but three factors – inactivity, low mood, and cognitive ability – could be important targets to reduce this risk, according to the results of a study presented at the World Congress on Osteoarthritis.
“There’s recently been increasing interest in whether osteoarthritis (OA) is associated with mortality as the literature has failed to find a consistent link,” said Simran Parmar, a third-year medical student at Keele University, Newcastle-Under-Lyme, U.K.
Three years later, data from another study (BMJ. 2011;342:d1165) suggested an increased risk, with standardized mortality ratios calculated to be 1.55 for all-cause mortality and 1.71 for cardiovascular-specific mortality when comparing those with OA to those without OA in the general population.
However, more recent meta-analyses, performed in 2016, have failed to show a relationship between mortality and OA (Semin Arthritis Rheum. 2016;46[2]:160–7; Sci Rep. 2016;6:24393).
“This could be because of heterogeneity among the studies,” Mr. Parmar reasoned, adding that there was still an unclear relationship between OA and mortality.
So the aim of the current study was not only to take another look at the association to determine its strength but also to see what factors might be mediating the association in order to perhaps explain why OA might be associated with an increased risk of death.
The analysis used data on more than 8,000 individuals participating in the NorStOP (North Staffordshire Osteoarthritis Project). This is a large, population-based, prospective cohort initiated in 2002 that includes adults aged 50 years or older who are registered at any of six general practices.
At baseline, the mean age of participants was 65 years, 51% were female, and just under 30% had OA. During 10 years of follow-up, 1,188 (14.7%) participants died.
Osteoarthritis was significantly associated with mortality in both unadjusted and adjusted analyses.
“For the average person presenting to general practice in North Staffordshire, there’s a 39.4% increased risk of mortality if they have osteoarthritis compared to if they don’t,” Mr. Parmar said.
After adjustment for potential confounding factors, such as age, NSAID use, and common comorbidities, the increased mortality risk remained, with around a 15% increased risk of death for those with OA versus those without.
“We proposed six different mediators of this relationship,” Mr. Parmar said. These were depression, anxiety, low walking frequency, cognitive impairment, insomnia, and obesity. “The reason we chose these is because they can be targets for therapy in primary care.”
Three mediators significantly affected the relationship: low walking frequency, depression, and cognitive impairment; the respective hazard ratios and 95% confidence intervals were 1.12 (1.09-1.15), 1.11 (1.08-1.15), and 1.06 (1.03-1.09).
“This tells us that these could possibly be on the pathway between osteoarthritis and mortality, and this could provide further evidence that they could be used for targeted therapy of osteoarthritis,” Mr. Parmar suggested.
“This type of mediation analysis has not been done in the osteoarthritis field before,” Mr. Parmar observed. He conceded that the mediators found might actually have contributed to the development of OA and that pain interference used in the definition of OA could have been caused by other factors.
Nevertheless, these data suggest that there may be actionable factors that could be used in primary care to reduce mortality in OA.
Mr. Parmar suggested that “encouraging physical activity and considering the impact of comorbidities can help reduce the risk of mortality in adults with osteoarthritis.”
The study was funded by Arthritis Research UK, the North Staffordshire Primary Care Consortium, and the Medical Research Council. Mr. Parmar had no conflicts of interest to disclose.
SOURCE: Parmar S et al. Osteoarthritis Cartilage. 2018;26(1):S14-15.
LIVERPOOL, ENGLAND – Osteoarthritis is associated with an increased risk in mortality, but three factors – inactivity, low mood, and cognitive ability – could be important targets to reduce this risk, according to the results of a study presented at the World Congress on Osteoarthritis.
“There’s recently been increasing interest in whether osteoarthritis (OA) is associated with mortality as the literature has failed to find a consistent link,” said Simran Parmar, a third-year medical student at Keele University, Newcastle-Under-Lyme, U.K.
Three years later, data from another study (BMJ. 2011;342:d1165) suggested an increased risk, with standardized mortality ratios calculated to be 1.55 for all-cause mortality and 1.71 for cardiovascular-specific mortality when comparing those with OA to those without OA in the general population.
However, more recent meta-analyses, performed in 2016, have failed to show a relationship between mortality and OA (Semin Arthritis Rheum. 2016;46[2]:160–7; Sci Rep. 2016;6:24393).
“This could be because of heterogeneity among the studies,” Mr. Parmar reasoned, adding that there was still an unclear relationship between OA and mortality.
So the aim of the current study was not only to take another look at the association to determine its strength but also to see what factors might be mediating the association in order to perhaps explain why OA might be associated with an increased risk of death.
The analysis used data on more than 8,000 individuals participating in the NorStOP (North Staffordshire Osteoarthritis Project). This is a large, population-based, prospective cohort initiated in 2002 that includes adults aged 50 years or older who are registered at any of six general practices.
At baseline, the mean age of participants was 65 years, 51% were female, and just under 30% had OA. During 10 years of follow-up, 1,188 (14.7%) participants died.
Osteoarthritis was significantly associated with mortality in both unadjusted and adjusted analyses.
“For the average person presenting to general practice in North Staffordshire, there’s a 39.4% increased risk of mortality if they have osteoarthritis compared to if they don’t,” Mr. Parmar said.
After adjustment for potential confounding factors, such as age, NSAID use, and common comorbidities, the increased mortality risk remained, with around a 15% increased risk of death for those with OA versus those without.
“We proposed six different mediators of this relationship,” Mr. Parmar said. These were depression, anxiety, low walking frequency, cognitive impairment, insomnia, and obesity. “The reason we chose these is because they can be targets for therapy in primary care.”
Three mediators significantly affected the relationship: low walking frequency, depression, and cognitive impairment; the respective hazard ratios and 95% confidence intervals were 1.12 (1.09-1.15), 1.11 (1.08-1.15), and 1.06 (1.03-1.09).
“This tells us that these could possibly be on the pathway between osteoarthritis and mortality, and this could provide further evidence that they could be used for targeted therapy of osteoarthritis,” Mr. Parmar suggested.
“This type of mediation analysis has not been done in the osteoarthritis field before,” Mr. Parmar observed. He conceded that the mediators found might actually have contributed to the development of OA and that pain interference used in the definition of OA could have been caused by other factors.
Nevertheless, these data suggest that there may be actionable factors that could be used in primary care to reduce mortality in OA.
Mr. Parmar suggested that “encouraging physical activity and considering the impact of comorbidities can help reduce the risk of mortality in adults with osteoarthritis.”
The study was funded by Arthritis Research UK, the North Staffordshire Primary Care Consortium, and the Medical Research Council. Mr. Parmar had no conflicts of interest to disclose.
SOURCE: Parmar S et al. Osteoarthritis Cartilage. 2018;26(1):S14-15.
REPORTING FROM OARSI 2018
Key clinical point:
Major finding: OA is associated with a 15% increased risk of mortality in the general population.
Study details: A large, prospective cohort study that included more than 8,000 adults older than 50 years in the general population who participated.
Disclosures: The study was funded by Arthritis Research UK, the North Staffordshire Primary Care Consortium, and the Medical Research Council. Mr. Parmar had no conflicts of interest to disclose.
Source: Parmar S et al. Osteoarthritis Cartilage. 2018;26(1):S14-15.