Acute Perioperative Comparison of Patient-Specific Instrumentation versus Conventional Instrumentation Utilization during Bilateral Total Knee Arthroplasty
Table 2
Perioperative outcomes between groups.
Category
Standard (N = 49)
PSI (N = 31)
value
Total length of surgery from incision to closure (min)
99 (21.3)
102.2 (13.4)
0.721
Tourniquet time (min), mean (SD)
Total
60.3 (16.1)
62.7 (10.5)
0.486
Left
57.8 (15.4)
57.4 (12.2)
0.906
Right
62.8 (19.5)
67.9 (13.6)
0.020
Intraoperative blood loss (mL), mean (SD)
253.8
275
0.530
Change in Hg (g/dL)1, mean (SD)
Pre-op to POD1
3.14 (1.31)
3.07 (0.99)
0.788
POD1 to POD2
0.97 (1.18)
0.62 (1.28)
0.221
Units of blood transfused (units of PRBCs)
1.2
1.03
0.577
0 units
23 (46.94%)
15 (48.39%)
—
1 unit
2 (4.08%)
1 (3.23%)
—
2 units
19 (38.78%)
14 (45.16%)
—
>2 units
5 (10.20%)
1 (3.23%)
—
Morphine milligram equivalent (mg), mean (SD)
Up to 24 hours post-op
35.8 (14.8)
37.8 (12.5)
0.543
24–48 hours post-op
32.7 (15.1)
28.3 (15.3)
0.208
Entire 48-hour period
68.7 (27.2)
66.1 (25.5)
0.667
Length of stay including surgery day (days), mean (SD)
4.5 (1.4)
4.4 (1.3)
0.611
<3
7 (14.29%)
6 (19.35%)
—
3–5
35 (71.43%)
20 (64.52%)
—
>5
7 (14.29%)
5 (16.13%)
—
Discharge disposition
0.450
Home
14 (28.60%)
10 (32.26%)
—
Inpatient rehab facility
8 (16.30%)
8 (25.81%)
—
Skilled nursing facility
27 (55.10%)
13 (41.94%)
—
1Excluding values that increased after a transfusion. Nonparametric statistics, specifically Mann–Whitney U test was used, for statistical significance.
