Survival of primary total hip arthroplasty in rheumatoid arthritis patients

Figures & data

Table 1.  Characteristics of THAs, patients with rheumatoid arthritis (RA), and patients with osteoarthritis (OA)

		RA patients		OA patients		p-value
		n	%	n	%
Gender	Female	1203	72	36,498	56	–
	Male	458	28	28,360	44	< 0.001
Age	0–59 years	595	36	11,115	17	–
	60–69 years	544	33	21,306	33	–
	70–79 years	435	26	23,418	36	–
	> 80 years	87	5	9,019	14	< 0.001
Comorbidity
	Low (0)	218	13	44,163	68	–
	Moderate (1–2)	1,256	76	17,010	26	–
	High (3+)	187	11	3,685	6	< 0.001
Cup	Cemented	783	47	28,077	43	–
	Uncemented	878	53	36,781	57	0.002
Stem	Cemented	1,215	73	44,360	68	–
	Uncemented	446	27	20,498	32	< 0.001
Total	-	1,661	100	64,858	100

Table 2.  Risk of revision in THA patients with rheumatoid arthritis (RA) compared to that in osteoarthritis (OA) patients. The p-values are connected to the adjusted RR

	Cause of revision	RA		OA		Crude RR (95% CI)	Adjusted RR^a (95% CI)	p-value
		n	%	n	%
Cup	Aseptic loosening	30	1.8	658	1.0	1.37 (0.95–1.98)	1.14 (0.77–1.68)	0.5
	Any cause	74	4.5	2,024	3.1	1.21 (0.96–1.53)	0.94 (0.74–1.20)	0.6
Stem	Aseptic loosening	15	0.9	752	1.2	0.61 (0.37–1.02)	0.54 (0.32–0.92)	0.02
	Any cause	48	2.9	2,082	3.2	0.77 (0.58–1.02)	0.62 (0.46–0.83)	< 0.01
Cup and stem	Any cause	89	5.4	2,979	4.6	1.00 (0.81–1.23)	0.81 (0.65–1.01)	0.07

^aRelative risk of revision with 95% CI, mutually adjusted for age, gender, comorbidity, duration of surgery, and type of fixation.

Figure 1.  The cumulative risk of revision of cups in RA patients and OA patients for aseptic loosening.

Figure 2.  The cumulative risk of revision of cups in RA patients and OA patients for any reason.

Figure 3.  The cumulative risk of revision of stems in RA patients and OA patients for aseptic loosening.

Figure 4.  The cumulative risk of revision of stems in RA patients and OA patients for any reason.