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Table 2 Comparison of perioperative variables between matched unassisted and technology-assisted cohorts

From: A comparison of utilization and short-term complications of technology-assisted versus conventional total knee arthroplasty

 

U-TKA (n = 8633)

TA-TKA (n = 8633)

p-Value

Operative time (min)—mean (SD)

92.6 (39.8)

92.4 (33.4)

0.670

Length of stay (days)—mean (SD)

2.76 (1.86)

2.68 (2.51)

0.017

Discharge destination—no. (%)

  

 < 0.001

 Home

6077 (70.4)

6376 (73.9)

 < 0.001

 Unskilled facility

7 (0.1)

4 (0.1)

0.366

 Rehab/skilled nursing facility

2238 (25.9)

1964 (22.7)

 < 0.001

 Expired/hospice

9 (0.1)

2 (0.0)

0.035

 Other/AMA

16 (0.2)

6 (0.1)

0.033

 Unknown

286 (3.3)

281 (3.3)

0.831

Major complication—no. (%)

810 (9.4)

659 (7.6)

 < 0.001

 Any wound complication

24 (0.3)

25 (0.3)

1.000

 Periprosthetic infection

5 (0.1)

6 (0.1)

0.774

 Transfusion

439 (5.1)

336 (3.9)

 < 0.001

 Systemic infection

24 (0.3)

23 (0.3)

1.000

 DVT/PE

105 (1.2)

98 (1.1)

0.672

 Cardiac

19 (0.2)

15 (0.2)

0.607

 Respiratory

76 (0.9)

59 (0.7)

0.167

 Neurologic

8 (0.1)

5 (0.1)

0.581

 Renal

6 (0.1)

1 (0.0)

0.125

Reoperations—no. (%)

75 (0.9)

87 (1.0)

0.344

 Unrelated operation

31 (0.4)

31 (0.4)

1.000

 Periprosthetic fracture

8 (0.1)

5 (0.1)

0.405

 Superficial irrigation and debridement

7 (0.1)

12 (0.1)

0.251

 Periprosthetic infection

10 (0.1)

14 (0.2)

0.414

 Hardware complication or dislocation

10 (0.1)

8 (0.1)

0.637

 Other operation related to TKA

9 (0.1)

17 (0.2)

0.116

Readmission—no. (%)

275 (3.2)

236 (2.7)

0.080

 Unspecified

58 (0.7)

63 (0.7)

0.648

 Gastrointestinal

23 (0.3)

24 (0.3)

0.884

 Cardiac

23 (0.3)

15 (0.2)

0.194

 Pulmonary

15 (0.2)

14 (0.2)

0.853

 Hematological

35 (0.4)

36 (0.4)

0.905

 Other medical diagnosis

37 (0.4)

22 (0.3)

0.050

 Unrelated musculoskeletal diagnosis

16 (0.2)

9 (0.1)

0.161

 Periprosthetic fracture

4 (0.0)

4 (0.0)

1.000

 Superficial surgical site infection

46 (0.5)

27 (0.3)

0.026

 Periprosthetic infection

14 (0.2)

18 (0.2)

0.479

 Unspecified TKA complication or dislocation

4 (0.0)

4 (0.0)

1.000

Mortality—no. (%)

4 (0.0)

9 (0.1)

0.267

  1. Bold values represent statistically significant differences (p < 0.05)
  2. No., number; SD, standard deviation; TA-TKA, technology-assisted total knee arthroplasty; U-TKA, unassisted total knee arthroplasty