Table 1 Patient and Operative Data

Number of patients (knees)

151

148

N/A

Age in years

63.8 ± 8.4 (44-84)

65.1 ± 9.1 (37-87)

.209

Sex (M:F)(M%)

52:99 (34.4%)

41:107 (27.7%)

.045

BMI (kg/m²)

37. 1 ± 6.6 (30.0-67.8)

37. 7 ± 5.9 (30.2-61.4)

.41

ASA Classification^a (mean)

2.9 ± 0.5

2.8 ± 0.6

0.13

1 (%)

0 (0%)

1 (0.7%)

-

2 (%)

30 (20.9%)

41 (27.2%)

.11

3 (%)

100 (70.3%)

99 (65.6%)

.90

4 (%)

13 (8.8%)

10 (6.7%)

.55

Operative time (min)

112.7 ± 20.6 (77-181)

127.4 ± 19.7 (92-223)

< 0.01

Tourniquet time (min)

110.4 ± 18.0 (71-155)

116.0 ± 18.8 (17-176)

.01

Estimated blood loss (mL)

111.6 ± 117.3 (10-1000)

176.7 ± 249.7 (25-2500)

.01

Change in hemoglobin at discharge (gm/dL)

-3.1 ± 1.1 (-5.7 - 0)

-2.9 ± 1.6 (-7.6 - +2)

.23

Patients transfused

21 (13.9%)

96 (64.9%)

< .01

Units transfused (mean)

0.3 ± 0.7 (0 - 4)

1.5 ± 1.4 (0 - 6)

< .01

Length of hospital stay (days)

3.30 ± 0.72 (2 - 7)

3.72 ± 1.09 (2 - 7)

< .01

To extended care facility at discharge (percentage)

42 (27.8%)

96 (63.6%)

< .01

Mean duration of follow-up (months)

14.9 ± 10.5 (4 - 55)

15.1 ± 10.5 (3 - 48)

.90