Opioid Analgesics and the Risk of Fractures in Older Adults With Arthritis

J Am Geriatr Soc. 2011 Mar;59(3):430-8. doi: 10.1111/j.1532-5415.2011.03318.x.

Abstract

Objectives: To compare the risk of fracture associated with initiating opioids with that of nonsteroidal anti-inflammatory drugs (NSAIDs) and the variation in risk according to opioid dose, duration of action, and duration of use.

Design: Retrospective cohort study.

Setting: Two statewide pharmaceutical benefit programs for persons aged 65 and older.

Participants: Twelve thousand four hundred thirty-six initiators of opioids and 4,874 initiators of NSAIDs began treatment between January 1, 1999, and December 31, 2006. Mean age at initiation of analgesia was 81; 85% of participants were female, and all had arthritis.

Measurements: Cox proportional hazards models, adjusted for several potential confounders, quantified fracture risk. Study outcomes were fractures of the hip, humerus or ulna, or wrist, identified using a combination of diagnosis (International Classification of Diseases, Ninth Revision, Clinical Modification) and procedure (Common Procedural Terminology) codes.

Results: There were 587 fracture events among the participants initiating opioids (120 fractures per 1,000 person-years) and 38 fracture events among participants initiating NSAIDs (25 fractures per 1,000 person-years) (hazard ratio (HR)=4.9, 95% confidence interval (CI)=3.5-6.9). Fracture risk was greater with higher opioid dose. Risk was greater for short-acting opioids (HR=5.1, 95% CI=3.7-7.1) than for long-acting opioids (HR=2.6, 95% CI=1.5-4.4), even in participants taking equianalgesic doses, with differential fracture risk apparent for the first 2 weeks after starting opioids but not thereafter.

Conclusion: Older people with arthritis who initiate therapy with opioids are more likely to experience a fracture than those who initiate NSAIDs. For the first 2 weeks after initiating opioid therapy, but not thereafter, short-acting opioids are associated with a greater risk of fracture than are long-acting opioids.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Analgesics, Opioid / administration & dosage*
  • Anti-Inflammatory Agents, Non-Steroidal / administration & dosage
  • Arthritis / drug therapy*
  • Female
  • Fractures, Bone / epidemiology*
  • Humans
  • Incidence
  • Male
  • Medicare
  • New Jersey / epidemiology
  • Pennsylvania / epidemiology
  • Proportional Hazards Models
  • Retrospective Studies
  • Risk Factors
  • United States

Substances

  • Analgesics, Opioid
  • Anti-Inflammatory Agents, Non-Steroidal