Table 2.

Results for primary THAs after pediatric hip disease and after primary osteoarthritis. Adjusted for age, sex, and type of fixation in the Cox model, with endpoints as indicated

Endpoint in the analysis	No. of THAs	No. of revisions	10–year survival a	RR b	95% CI c	p–value
Any reason for revision	302,838	12,067
Pediatric hip disease	14,403	853	93.6%	1.04	0.96–1.12	0.4
Primary osteoarthritis	288 435	11,214	93.8%	1	–	–
Aseptic loosening	302 838	5,803
Pediatric hip disease	14,403	396	97.2%	1.00	0.89–1.11	1.0
Primary osteoarthritis	288 435	5,407	97.0%	1	–	–
Dislocation	302 838	2,641
Pediatric hip disease	14,403	156	98.7%	1.10	0.92–1.31	0.3
Primary osteoarthritis	288 435	2,485	98.8%	1	–	–
–
Infection	302 838	1,806
Pediatric hip disease	14,403	72	99.3%	0.86	0.67–1.10	0.2
Primary osteoarthritis	288 435	1,734	99.3%	1	–	–

^a Cox–adjusted 10–year survival.

^b Cox relative revision risk.

^c 95% confidence interval for RR.