Table 1.

Listing of Inclusion and Exclusion Criteria for Events Occurring in the Total Joint Replacement (TJR) Study Cohort

Criteria	Event Description	Number of Events
Inclusion	1. All cause readmission within 30 days of TJR surgery	26
	2. Health care utilization following TJR for diagnoses consistent with a complication*	33
Exclusion	1. Events occurring prior to TJR surgery	1
	2. Elective orthopedic procedures	11
	3. Elective procedures unrelated to joint replacements	17
	4. Treatment of unrelated medical comorbid conditions	36
	5. Multiple health care encounters with the same diagnosis within 30 days of each other were collapsed into a single event**	8

Source:

^*Based on the National Quality Forum, Knee Society and CMS diagnosis listings.

Notes:

^**8 patients had a collective 18 health care encounters (6 patients had 2 encounters and 2 patients had 3 encounters) within 30 days associated with the same diagnosis that was collapsed into 1 event per patient; thus to total number of included events equal all health care utilization that met inclusion criteria (26 + 33), subtracting the second and third encounters for the same diagnosis ([26 + 33]−8=49).