What are the inpatient and day case costs following primary total hip replacement of patients treated for prosthetic joint infection: a matched cohort study using linked data from the National Joint Registry and Hospital Episode Statistics

Table 2 Average total and annual inpatient and day case hospital admission costs over the 5 years following THR, by revised PJI and comparator patients

	Revised PJI group (n = 422)	Comparator group (n = 1923)	Adjusted difference in costs (£) (95% confidence interval)
	Adjusted cost (£)	Adjusted cost (£)
	Mean (SE)	Mean (SE)
1st year post-primary	14,686 (816)	1959 (111)	12,727 (11,094 to 14,360)
2nd year post-primary	10,575 (682)	1503 (91)	9071 (7719 to 10,424)
3rd year post-primary	6974 (580)	1512 (97)	5462 (4306 to 6618)
4th year post-primary	5168 (501)	1584 (131)	3584 (2611 to 4557)
5th year post-primary	4427 (431)	1568 (101)	2859 (1999 to 3720)
Total over 5 years	41,633 (1303)	8181 (289)	33,452 (30,828 to 36,077)

Marginal means after adjusting for excess zero; adjusted for age, sex, ASA grade, diagnosis of osteoarthritis, operation date, Charlson Comorbidity Index, bearing surface and procedure

ISSN: 1741-7015