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Table 1 Patient and Operative Data

From: Perioperative safety of two-team simultaneous bilateral total knee arthroplasty in the obese patient

Characteristic Unilateral Bilateral P value
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 Classificationa (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
  1. a ASA Classification: American Society of Anesthesiologists physical status classification system.