Reduced medium-term mortality following primary total hip and knee arthroplasty with an enhanced recovery program

Figures & data

Table 1. Comparison of patient demographics preoperatively in the 2 groups

	TRAD (n = 3,000)	ER (n = 1,500)	p-value ^a
Mean age, years	69	68
THR	1368	630
TKR	1632	870
Sex (M : F)	1482 : 1518	711 : 789	0.2
Co-morbidities, n (%)
Hypertension	921 (31)	673 (45)	< 0.001
Atrial fibrillation	143 (5)	84 (6)	0.3
Ischemic heart disease	211 (7)	113 (8)	0.6
Diabetes mellitus
insulin-dependent	20 (0.7)	18 (1)	0.09
non-insulin-dependent	205 (7)	150 (10)	< 0.001
Chronic obstructive
pulmonary disease	85 (3)	67 (4)	0.006
Alzheimer’s disease	6 (0.2)	5 (0.3)	0.6

^a Chi-squared test with continuity correction.

Table 2. Comparison of mortality rates in the two groups

	TRAD (n = 3,000)	ER (n = 1,500)	p-value (chi-squared test)
Dead by 1 year	63 (2.1%)	19 (1.3%)	0.05
Dead by 2 years	114 (3.8%)	40 (2.7%)	0.05

Figure 1. Kaplan-Meier (K-M) survival curves for both groups ± 95% Greenwood confidence interval (dotted lines). Note that the two K-M survival curves fall outwith the ± 95% Greenwood confidence intervals. The level of significance is 0.05.

Figure 2. Cause of death for patients who died up to 2 years post surgery, reported as a rate per 1,000 procedures.