Factors associated with the incidence of revision total knee arthroplasty in Korea between 2007 and 2012: an analysis of the National Claim Registry

Table 2 Incidence of revision total knee arthroplasty according to hospital and prosthesis manufacturer volume

		Study cohort (n = 260,068)
Factor	Volume	Number of patients (%)	Incidence rate (per 100,000 person-years)
Hospital^a	<20	19,335 (7.4)	536.9
	20–199	99,797 (38.4)	432.3
	≥200	140,936 (54.2)	300.1
Manufacturer^b	<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

ISSN: 1471-2474