Table 6.

Annual return on investment for collecting outcomes data in primary total joint arthroplasty.

Total allocated cost per yeara	$78,500
Projected patient enrollment per year	300
Actual patient enrollment per yearb	180

	Projected datasets	Actual datasetsc	Allocated cost per dataset	Actual cost per datasetd	Annual investment loss
Baseline	300	180	$65.42	$109	−$7850
6 mo	300	153	$65.42	$128	−$9616.74
12 mo	300	124	$65.42	$158	−$11,513.92
24 mo	300	72	$65.42	$272	−$14,915.76
Total	1200	529	$65.42	$148	−$43,896.82

^aThe total allocated costs reflect the salary of a dedicated research assistant paid at 0.75 full-time equivalent ($75,000) and data maintenance/licensing fees ($3500).

^bPatient participation in the database is voluntary and requires willingness to participate in surveys during follow-up visits. Patients can opt out at any time if they wish.

^cActual number of datasets is based on actual follow-up rates of 100%, 85%, 69%, and 40% at baseline, 6 mo, 12 mo, and 24 mo, respectively.

^dCost per dataset is derived by dividing the total costs for 3 time periods (0-6 mo, 0-12 mo, or 0-24 mo) by the number of complete datasets generated during each period.