Table 3.

Complications within 1 year of primary total hip arthroplasty or primary total knee arthroplasty

	Primary THA			Primary TKA
	n	RR a	95% CI	n	RR a	95% CI
Total		619			368
Re-admissions	35	5.7	4.3–7.0	37	10.0	8.4–12
Revisions	18	2.9	2.0–3.9	12	3.3	2.3–4.3
Infection	10	1.6	0.9–2.3	5	1.4	0.7–2.0
Dislocation	6	1.0	0.4–1.5	–	–	–
Impaired mobility	–	–	–	1	0.3	0.0–0.6
Fracture	1	0.2	–0.1–0.4	–	–	–
Mechanical causes	1	0.2	–0.1–0.4	5	1.4	0.7–2.0
Reoperations	7	1.1	0.5–1.7	12	3.3	2.3–4.3
Dislocation	5	0.8	0.3–1.3	3	0.8	0.3–1.3
Gluteal insufficiency	1	0.2	–0.1–0.4	–	–	–
Quadriceps rupture	–	–	–	1	0.3	0.0–0.6
Impaired mobility	–	–	–	6	1.6	0.9–2.3
Fracture	1	0.2	–0.1–0.4	1	0.3	0.0–0.6
Other causes	–	–	–	1	0.3	0.0–0.6
Other causes	10	1.6	0.9–2.6	13	3.5	2.5–4.6
DVT	1	0.2	–0.1–0.4	–	–	–
Hematoma	1	0.2	–0.1–0.4	–	–	–
Stroke	1	0.2	–0.1–0.4	–	–	–
Ileus	1	0.2	–0.1–0.4	–	–	–
Superficial infection	–	–	–	1	0.3	0.0–0.6
Peroneus palsy	–	–	–	1	0.3	0.0–0.6
Quadriceps rupture	–	–	–	1	0.3	0.0–0.6
Urinary infection	–	–	–	1	0.3	0.0–0.6
Gluteal insufficiency	2	0.3	0.0–0.6	–	–	–
Other causes	4	0.6	0.2–1.1	9	2.4	1.6–3.3
Leg length difference (> 2 cm)	3	0.5	0.1–0.9	1	0.3	0.0–0.6
Superficial infection	13	2.1	1.3–2.9	15	4.1	3.0–5.2
Urinary infection	27	4.4	3.2–5.5	22	6.0	4.6–7.3
Pneumonia	2	0.3	0.0–0.6	–	–	–
Impaired mobility	–	–	–	12	3.3	2.3–4.3
Peroneus palsy	–	–	–	1	0.3	0.0–0.6
Gluteal insufficiency	2	0.3	0.0–0.6	–	–	–
Other causes	15	2.4	1.6–3.3	11	3.0	2.0–4.0

^a Relative risk, %.