Significant cost savings and similar patient outcomes associated with early discharge following total knee arthroplasty

Article Figures & Tables

Table 1

Demographic and clinical characteristics of the study sample

BMI = body mass index; MCS = mental component score; PCS = physical component score; SD = standard deviation; WOMAC = Western Ontario & McMaster Universities Osteoarthritis Index.
↵* Unless indicated otherwise.

Table 2

In-hospital costs

Cost	Group; mean ± SD		Mean difference (95% CI)	p value
Cost	Early discharge	Standard care	Mean difference (95% CI)	p value
Operating room	1438.85 ± 275.62	1622.77 ± 484.51	−183.91 (−395.17 to 53.31)	0.09
Intraoperative medications	104.36 ± 13.09	77.38 ± 21.76	26.98 (14.41 to 37.90)	< 0.001
Inpatient stay	649.62 ± 281.71	1279.71 ± 515.98	−630.09 (−864.47 to −413.44)	< 0.001
Total cost^*	2563.48 ± 396.48	3497.92 ± 916.27	−934.44 (−1453.16 to −483.54)	< 0.001

CI = confidence interval; SD = standard deviation.
↵* The total cost does not include procedure-related equipment and implant costs, as these were assumed to be similar between groups.

Table 3

Patient-reported outcomes 1 year postoperative

Outcome measure	Group; mean ± SD		Mean difference (95% CI)	p value
Outcome measure	Early discharge	Standard care	Mean difference (95% CI)	p value
SF12 MCS	61.4 ± 9.5	58.4 ± 9.9	2.7 (−2.3 to 7.8)	0.27
SF12 PCS	47.4 ± 11.4	49.5 ± 11.8	−1.8 (−8.3 to 4.7)	0.56
WOMAC Total	81.3 ± 13.5	80.4 ± 23.3	0.92 (−10.3 to 14.7)	0.88

CI = confidence interval; MCS = mental component score; PCS = physical component score; SD = standard deviation; WOMAC = Western Ontario & McMaster Universities Osteoarthritis Index.