ASA I-II Patients MIS +TJRA Cohort† (n=25) Control Cohort † (n=25) Cost Difference § (95% CI) P-value
Hospital Costs (Medicare Part A) $9,727 (9,687)
±1,126
$13,365 (12,412)
±2,847
$3,638
(2,512; 4,982)
<0.001
Physician Costs (Medicare Part B) $2,036 (2,062)
±110
$2,432 (2,366)
±594
$396
(197; 693)
0.003
Anesthesia $335 (340)
±39
$431(428)
±73
$96
(65; 130)
<0.001
Total Costs $11,763 (11,774)
±1,165
$15,796 (15,010)
±3,179
$4,034
(2,758; 5,514)
<0.001
ASA III-IV Patients MIS + TJRA Cohort†
(n=9)
Control Cohort†
 (n=9)
Cost Difference §
(95% CI)
P-value
Hospital Costs (Medicare Part A) $9,364 (9,440)
±1,111
$15,013 (12,493)
±5,210
$5,649
(2,679; 9,334)
0.006
Physician Costs (Medicare Part B) $2,078 (2,082)
±129
$2,570 (2,486)
±466
$492
(176; 819)
0.008
Anesthesia $336 (345)
±42
$481 (454)
±144
$144
(58; 242)
0.01
Total Costs $11,443 (11,416)
±1,100
$17,583 (14,979)
±5,643
$6,140
(2,937; 10,145)
0.006
*Estimated costs per patient are reported in 2004 constant dollars.
†Values are presented as mean (median) ± standard deviation.
§Intra-pair differences are calculated as Control minus (MIS + TJRA). Bootstrap 95% C.I. using the percentile method.
MIS=minimally-invasive surgery; TJRA=Total Joint Regional Anesthesia; C.I=Confi dence interval
Table 3: Hospital and Physician Costs of Total Joint Replacement Surgery and ASA Physical Status.