Table 1.

Patient characteristics

	RA	OA	p-value
No. of THRs	13,384	377,287
Mean age (SD), years	62 (14)	69 (9.6)	< 0.001
% females	76%	60%	< 0.001
No. of primary THRs			< 0.001
1995–2001	7,047	130,613
2002–2010	6,337	246,674
Type of fixation, n (%)			0.3
Cemented	8,633 (65)	245,464 (65)
Uncemented	3,034 (23)	83,547 (22)
Hybrida	1,143 (8.5)	31,619 (8.4)
Inverse hybrid	574 (4.3)	16,657 (4.4)
Mean follow-up (SD), years	7.0 (4.3)	6.1 (4.1)	< 0.001

^aHybrid: cemented stem and uncemented cup.