Determining the need for hip and knee arthroplasty: the role of clinical severity and patients' preferences.
BACKGROUND
Area variation in the use of surgical interventions such as arthroplasty is viewed as concerning and inappropriate.


OBJECTIVE
To determine whether area arthroplasty rates reflect patient-related demand factors, we estimated the need for and the willingness to undergo arthroplasty in a high- and a low-use area of Ontario, Canada.


METHODS
Population-based mail and telephone survey.


METHODS
All adults aged > or =55 years in a high (n = 21,925) and low (n = 26,293) arthroplasty use area.


METHODS
We determined arthritis severity and comorbidity with questionnaires, established the presence of arthritis with examination and radiographs, and evaluated willingness to have arthroplasty with interviews. Potential arthroplasty need was defined as severe arthritis, no absolute contraindication for surgery, and evidence of arthritis on examination and radiographs. Estimates of need were then adjusted for patients' willingness to undergo arthroplasty.


RESULTS
Response rates were 72.0% for questionnaires and interviews. The potential need for arthroplasty was 36.3/1,000 respondents in the high-rate area compared with 28.5/1,000 in the low-rate area (P <0.0001). Among individuals with potential need, only 14.9% in the high-rate area and 8.5% in the low-rate area were definitely willing to undergo arthroplasty (P = 0.03), yielding adjusted estimates of need of 5.4/1,000 and 2.4/1,000 in the high- and low-rate areas, respectively.


CONCLUSIONS
Demonstrable need and willingness were greater in the high-rate area, suggesting these factors explain in part the observed geographic rate variations for this procedure. Among those with severe arthritis, no more than 15% were definitely willing to undergo arthroplasty, emphasizing the importance of considering both patients' preferences and surgical indications when evaluating need and appropriateness of rates for surgery.
Faculty of Medicine, University of Toronto, Ontario, Canada. g.hawker@utoronto.ca
G A
GA
Hawker
J G
JG
Wright
P C
PC
Coyte
J I
JI
Williams
B
B
Harvey
R
R
Glazier
A
A
Wilkins
E M
EM
Badley
D000203:Activities of Daily Living; D000368:Aged; D019643:Arthroplasty, Replacement / Q000523:psychology* / Q000706:statistics & numerical data*; D002755:Choice Behavior; D018672:Community Health Planning; D005260:Female; D015577:Geriatric Assessment; D019538:Health Care Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D020380:Needs Assessment / Q000458:organization & administration*; D009864:Ontario / Q000453:epidemiology; D015207:Osteoarthritis, Hip / Q000145:classification* / Q000453:epidemiology / Q000523:psychology* / Q000601:surgery; D020370:Osteoarthritis, Knee / Q000145:classification* / Q000453:epidemiology / Q000523:psychology* / Q000601:surgery; D017060:Patient Satisfaction; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data*; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires