1–year follow–up of 920 hip and knee arthroplasty patients after implementing fast–track

Figures & data

Table 1. Patient characteristics in the different groups (primary total hip arthroplasty and primary total knee arthroplasty; revision total hip arthroplasty and revision total knee arthroplasty)

	Primary surgery		Revision surgery
	THA	TKA	THA	TKA
Mean age (range), years	65 (17–90)	66 (36–89)	68 (39–87)	67 (46–82)
No. of men/women	212/407	137/232	21/33	11/16
Mean BMI (SD), kg/m^2	27 (4)	29 (5)	27 (5)	29 (5)
ASA I, %	17	13	6	11
ASA II, %	68	67	69	59
ASA III, %	15	18	26	30

Figure 1. Participants from inclusion until 1–year follow–up.

Figure 2. Pain at rest (upper panel) and mobilization (lower panel) at 8 time points, from preoperatively until 1 year postoperatively. Lines represent mean pain score for each patient group.

Table 2. Patient–reported outcome scores (PROMS) in the 4 different groups: EQ–5D, HOOS–PS, KOOS–PS, and the physical function scores HHS and KSS. For abbreviations, see text. All scores were obtained preoperatively, 8 and 12 weeks postoperatively, and 1 year postoperatively. Data are mean (SD)

	Primary surgery		Revision surgery
	THA	TKA	THA	TKA
Preoperatively
EQ–5D index score	0.42 (0.30)	0.49 (0.29)	0.42 (0.32)	0.38 (0.36)
HOOS–PS/KOOS–PS	45 (16)	47 (13)	49 (18)	49 (11)
HHS	53 (14)		52 (24)
KSS knee score		41 (14)		49 (19)
KSS function score		56 (22)		43 (23)
8/12 weeks postoperatively
EQ–5D index score	0.76 (0.21)	0.68 (0.24)	0.62 (0.32)	0.53 (0.32)
HOOS–PS/KOOS–PS	22 (14)	37 (11)	33 (16)	41 (12)
HHS	82 (13)		69 (20)
KSS knee score		61 (19)		64 (15)
KSS function score		59 (25)		45 (28)
1 year postoperatively
EQ–5D index score	0.79 (0.24)	0.76 (0.230)	0.67 (0.27)	0.62 (0.25)
HOOS–PS/KOOS–PS	17 (15)	30 (15)	27 (15)	34 (15)
HHS	89 (14)		77 (20)
KSS knee score		75 (19)		62 (13)
KSS function score		78 (24)		65 (25)

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, %.

Table 4. Complications within 1 year of revision surgery for hip and knee patients

	Revision THA			Revision TKA
	n	RR ^a	95% CI	n	RR ^a	95% CI
Total	54			28
Re-admissions	3	5.6	4.3–6.9	2	7.1	5.7–8.6
Revisions
Infection	2	3.7	2.6–4.8	1	3.6	2.5–4.6
Mechanical causes	–	–	–	1	3.6	2.5–4.6
Other causes	–	–	–	–	–	–
Sub dislocation	1	1.9	1.1–2.6	–	–	–
Superficial infection	1	1.9	1.1–2.6	–	–	–
Urinary infection	2	3.7	2.6–4.8	1	3.6	2.5–4.6
Pneumonia	–	–	–	1	3.6	2.5–4.6

^a Relative risk, %.