Validation of data in the Norwegian Arthroplasty Register and the Norwegian Patient Register : 5,134 primary total hip arthroplasties and revisions operated at a single hospital between 1987 and 2003

Figures & data

Table 1.  Number of operations reported to Stavanger University Hospital (SUH) and the Norwegian Arthroplasty Register (NAR), 1987–2003

	Primary THA	Revision^a	Girdle-stone	Total
SUH	4,306	828	86	5,134
NAR	4,297	818	77	5,115
Difference:	−9	−10	−9	−19
NAR and SUH	(0.2%)	(1.2%)	(10.5%)	(0.4%)

a Girdlestone operations included.

Table 2.  Classification of causes of incorrect registration in the Norwegian Arthroplasty Register (NAR) of data reported from a local hospital

	Date of operation			Index hip	Total
	Day	Month	Year
Typing error at NAR	6	4	0	0	10
Incorrect information^a	4	5	10	12	31
Illegible writing^a	19	8	0	0	27
Total	29	17	10	12	68

^aon form

Kaplan-Meier estimated survival curves with 95% confidence limits, for primary total hip replacements reported to the Norwegian Arthroplasty Register from a local hospital.The endpoint was defined as Girdlestone revision as registered by the Norwegian Arthroplasty Register (n = 39) and in the local database (n = 44).

Table 3.  The number of operations reported to Stavanger University Hospital (SUH), the Norwegian Arthroplasty Register (NAR) and the Norwegian Patient Register (NPR) during the years 1999–2002

Year	SUH			NAR			NPR			Difference^a NAR and SUH	Difference^a NPR and SUH
	P^b	R^b	Total	P^b	R^b	Total	P^b	R^b	Total
1999	318	72	390	318	70	388	316	58	374	−2 (0.5%)	−16 (4.1%)
2000	300	68	368	298	68	366	301	54	355	−2 (0.8%)	−13 (3.5%)
2001	234	69	303	233	67	300	231	61	292	−3 (1.0%)	−11 (3.6%)
2002	272	63	335	272	63	335	272	56	328	0 (0.0%)	−7 (2.1%)
Total	1,124	272	1,396	1,121	268	1,389	1,120	229	1,349	−7 (0.5%)	−47 (3.4%)

^a Difference in total number of operations.

^b P – primary THR, R – revision.