Factors Related to Postoperative Pain Trajectories following Total Knee Arthroplasty: A Longitudinal Study of Patients Admitted to a Russian Orthopaedic Clinic
Table 4
Descriptive surgical and clinical characteristics by duration of surgery.
Characteristic
Surgery duration
Statistics
≤90 minutes
>90 minutes
Implant type, % ()
All 5, Fisher’s exact
Sigma
47.4% (27)
37.2% (16)
Sigma versus AGC versus others
AGC
43.9% (25)
20.9% (9)
χ2(2) = 16.0,
Other implants:
21.7% (5)
78.3% (18)
Common versus uncommon
LCS
35.7% (5)
64.3% (9)
χ2(1) = 15.2,
Scorpio NRG
0% (0)
100% (5)
NexGen
0% (0)
100% (4)
Tourniquet use, % ()
24.6% (14)
16.3% (7)
χ2(1) = 1.01,
Bleeding, mL, mean (SD)
297 (142)
401 (215)
t(98) = 2.93,
Hemoglobin, mL
Preoperative, mean (SD)
126.9 (11.4)
132.6 (12.9)
t(98) = 2.34,
Day 0 at 20:00, mean (SD)
106.3 (11.9)
108.1 (11.4)
t(98) = 0.78,
Day 4, mean (SD)
100.6 (13.7)
98.2 (13.3)
t(98) = 0.88,
Creatinine, Day 0
63.2 (13.3)
67.3 (20.5)
t(98) = 1.20,
C-reactive Protein, Day 0
4.23 (4.68)
3.86 (6.29)
t(98) = 0.33,
Days in hospital, mean (SD)
Preoperative
6.7 (4.4)
8.0 (3.6)
t(98) = 1.53,
Postoperative
8.9 (2.0)
9.5 (2.9)
t(98) = 1.15,
Total
15.6 (4.1)
17.4 (4.4)
t(98) = 2.14,
Note. Surgery duration did not differ by patient age or sex. Common implants were Sigma and AGC, and uncommon implants were LCS, Scorpio NRG, and NexGen.
