Table 1.

Number of data entry records (i.e. hip and knee registrations) in the LROI

Year	Hip arthroplasty			Knee arthroplasty
	Primary THA	Hemiarthro-plasties	Revision hip	Primary TKA	Primary unicondylar	Primary othera	Revision knee
2007 b	8,579	921	1,267	6,688	678	358	594
2008 b	14,516	1,379	1,813	10,942	1,115	420	878
2009 b	21,007	2,056	2,675	16,020	1,524	611	1,296
2010	22,932	2,328	2,940	17,872	1,697	669	1,617
2011	23,510	2,376	3,192	18,907	1,598	568	1,790
2012	24,889	2,748	3,708	21,009	1,586	556	2,058
2013	25,642	2,932	3,454	21,654	1,804	302	2,215
Total	141,075	14,740	19,049	113,092	10,002	3,484	10,448

THA: Total hip arthroplasty; TKA: Total knee arthroplasty

^aPrimary other included patellofemoral, other, and unknown primary knee arthroplasties

^b2007–2009: run-in phase of the LROI