Table 1.

Patient demographics

	Males	Females	Mean age	Right joint	Left joint	Warfarin
Total knee (n=92)
Drainage	16	28	67	22	22	0
No  drainage	29	19	70	26	22	0
Total hip (n=34)
Drainage	11	8	70	11	8	1
No  drainage	7	8	69	11	4	2