Table 1.

Total costs, erioperative period up to 45 days postoperatively

	Open	MIS
Total patients	101	109
Original procedure	$2,552,503.48	$2,581,871.77
Residual events	$131,825.50	$33,387.67
Totals per group	$2,703,824.32	$2,638,679.15
Average total cost per procedure	$26,770.54	$24,208.07