Table 1.

Demographic data, and data concerning fixation technique, surgical approach, cause of revision, and procedure performed at revision for each country

	Denmark	Sweden	Norway	Finland
No. of THRs	92,078	180,839	86,076	79,740
Follow-up time (years), mean	5.9	6.7	6.4	6.6
(range)	(0–17)	(0–17)	(0–17)	(0–17)
Male sex, %	41.9	40.0	31.8	41.1
Age groups, %
< 55	10.8	9.0	10.7	11.9
55–64	22.7	21.8	20.6	24.1
65–74	34.8	34.4	34.3	37.8
≥ 75	31.6	34.8	34.5	26.3
Diagnosis, %
Primary osteoarthritis	76.4	78.7	73.0	82.4
Hip fracture	13.9	12.3	11.7	3.7
Nontraumatic femoral head necrosis	2.6	3.1	1.6	1.1
Inflammatory arthritis	1.6	2.3	2.4	4.6
Pediatric hip disease	3.1	1.8	9.0	1.2
Other	2.3	1.9	2.3	7.0
Fixation, %
Cemented	36.9	84.1	70.8	39.3
Uncemented	40.3	7.5	15.3	47.8
Hybrid	21.9	3.1	3.3	9.6
Reverse hybrid	0.9	5.3	10.6	3.4
Approach, %
Posterior	92.2	57.2	24.6	NA
Cause of revision, %
Aseptic loosening	36.2	53.3	48.8	48.5
Deep infection	15.4	14.1	15.6	6.7
Periprosthetic femoral fracture	8.2	8.2	4.0	7.7
Dislocation	28.5	19.6	20.1	19.3
Pain only	3.6	0.6	3.0	NA
Other	8.1	4.3	8.7	17.8
Procedure at revision, %,
Total revision	16.7	31.5	20.6	NA
Only stem revised	22.3	22.5	23.9	NA
Only cup or liner revised	44.2	32.1	37.0	NA
Extraction of the prosthesis	8.4	5.8	7.8	NA
Other	8.5	8.2	10.7	NA

NA: not available.