Patients with osteoarthritis and avascular necrosis have better functional outcomes and those with avascular necrosis worse pain outcomes compared to rheumatoid arthritis after primary hip arthroplasty: a cohort study

Table 4 Multivariable-adjusted association of diagnosis with ADL limitation and pain at two and five years after primary THA

	OA		AVN		Other
	OR^a(95% CI)	P-value	OR^a(95% CI)	P-value	OR^a(95% CI)	P-value
Moderate-severe overall ADL limitation^b
Two-years	0.5 (0.3,0.8)	0.01	0.4 (0.2 to 0.8)	0.01	1.0 (0.5 to 1.9)	0.91
Five-years	0.7 (0.4 to 1.4)	0.36	0.9 (0.4 to 1.8)	0.78	2.1 (0.9 to 4.8)	0.07
Moderate-severe hip pain^c
Two-years	1.6 (0.6 to 4.5)	0.40	2.8 (0.9 to 8.5)	0.06	2.2 (0.6 to 7.3)	0.22
Five-years	2.1 (0.7 to 6.5)	0.22	4.1 (1.2 to 14.1)	0.02	4.2 (1.1 to 16.0)	0.04

^aReference category is rheumatoid arthritis/inflammatory arthritis; ^badjusted for 16 additional covariates/confounders: age, gender, BMI, Deyo-Charlson comorbidity score, ASA class, distance from the medical center, cement fixation, preoperative limitation in seven activities, anxiety and depression; ^cadjusted for 10 additional covariates/confounders: age, gender, BMI, Deyo-Charlson comorbidity score, ASA class, distance from the medical center, cement fixation, preoperative pain, anxiety and depression. Numbers in bold represents significant p-value <0.05. ADL, activities of daily living; ASA, American Society of Anesthesiologists; AVN, avascular necrosis of bone; BMI, body mass index; CI, confidence interval; OA, osteoarthritis; OR, odds ratio; RA, rheumatoid arthritis; THA, total hip arthroplasty.

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