| | |
Study cohort (n = 260,068)
|
|---|
|
Factor
|
Volume
|
Number of patients (%)
|
Incidence rate (per 100,000 person-years)
|
|---|
|
Hospitala
|
<20
|
19,335 (7.4)
|
536.9
|
|
20–199
|
99,797 (38.4)
|
432.3
|
|
≥200
|
140,936 (54.2)
|
300.1
|
|
Manufacturerb
|
<1,500
|
8,746 (3.4)
|
772.3
|
|
1500–3999
|
30,153 (11.6)
|
453.9
|
|
≥4000
|
221,169 (85.0)
|
345.6
|
-
aMean annual number of primary total knee arthroplasties performed in each hospital during the study period
-
bMean annual number of prostheses applied to patients undergoing primary total knee arthroplasty during the study period
