A population-based nested case-control study of the costs of hip and knee replacement surgery

Med Care. 2009 Jul;47(7):732-41. doi: 10.1097/MLR.0b013e3181934553.


Background: Studies of total joint arthroplasty (TJA) have not evaluated the costs and outcomes in the context of expected arthritis worsening.

Objectives: Using a cost-consequence approach, to examine changes in direct health care costs and arthritis severity after TJA for hip/knee arthritis compared with contemporaneous changes in matched controls.

Research design: Case control study nested in a population-based prospective cohort.

Subjects: In a population cohort with disabling hip/knee osteoarthritis followed from 1996 to 2003, primary TJA recipients were matched with cohort nonrecipients on age, sex, region of residence, comorbidity, and inflammatory arthritis diagnosis.

Measures: Pre- and postoperative total and arthritis-attributable direct health care costs, arthritis severity, and general health status were compared for cases and matched controls.

Results: Of 2109 participants with no prebaseline TJA, 185 cases received a single elective TJA during the follow-up period; of these, 183 cases and controls were successfully matched. Mean age was 71 years, 77.6% were female, 35.5% had > or =2 comorbidities, and 81.5% had > or =2 joints affected. At baseline, controls had less pain and disability and lower total and arthritis-attributable health care costs than cases. After surgery, although overall health care utilization was unchanged, cases experienced significant decreases in arthritis-attributable costs (mean decrease $278 including prescription drugs) and pain and disability (P < 0.0001 for all). Over the same time period, controls experienced a significant increase in total health care costs (mean increase $1978 including prescription drugs, P = 0.04) and no change or worsening of their arthritis status.

Conclusion: Compared with matched controls, arthroplasty is associated with significant reductions in pain, disability, and arthritis-attributable direct costs.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Arthroplasty, Replacement, Hip / economics*
  • Arthroplasty, Replacement, Knee / economics*
  • Case-Control Studies
  • Community Health Planning
  • Cost of Illness
  • Cost-Benefit Analysis
  • Disabled Persons / rehabilitation
  • Disabled Persons / statistics & numerical data
  • Female
  • Health Care Costs / statistics & numerical data*
  • Health Services Research
  • Health Status
  • Humans
  • Male
  • National Health Programs / economics
  • National Health Programs / statistics & numerical data
  • Ontario / epidemiology
  • Osteoarthritis, Hip / complications
  • Osteoarthritis, Hip / economics
  • Osteoarthritis, Hip / epidemiology
  • Osteoarthritis, Hip / surgery
  • Osteoarthritis, Knee / complications
  • Osteoarthritis, Knee / economics
  • Osteoarthritis, Knee / epidemiology
  • Osteoarthritis, Knee / surgery
  • Pain / etiology
  • Pain / prevention & control
  • Prospective Studies
  • Treatment Outcome