Table 2.

Surgical Data

Demographics	Arthroplasty			Fusion
	Prior Surgery	Discectomy	No Prior Surgery	Prior Surgery	Discectomy	No Prior Surgery
N	37	21	53	12	6	31
Total Surgery Time (Min)
Mean (Std)	97.5 (29.44)	95.6 (29.42)	115.6 (53.69)	106.3 (66.58)	81.8 (29.14)	128.2 (66.23)
Median	88	87	99	74	67.5	115
Min, Max	56, 175	56, 175	45, 250	55, 248	62, 137	60, 355
Estimated Blood Loss (cc)
Mean (Std)	158.3 (143.3)	145.2 (124.65)	248.7 (277.81)	251.6 (440.72)	341.5 (618.46)	186.0 (169.19)
Median	100	100	150	75	99.5	150
Min, Max	50, 600	50, 500	25, 1500	50, 1600	50, 1600	20, 700
Duration of Hospital Stay
Mean (Std)	3.7 (0.97)	3.8(1.22)	3.7(.86)	4.3(2.50)	3.5(0.55)	4.3(1.47)
Median	4	4	4	4	3.5	4
Min, Max	1, 6	1, 6	2, 6	3, 12	3, 4	2, 8