Table 3 Comparison of demographic, operative, and radiologic parameters between the groups

Knees, n (%)^*

34 (45.3)

41 (54.7)

–

Age, years^†

69.3 (59.0‒82.0)

73.3 (67.0‒84.0)

0.105

Sex, M/F^*

6/28

11/30

0.344

BMI, kg/m^2†

26.8 (20.2‒30.8)

26.9 (23.2‒31.2)

0.613

ASA class 3/4^*

15/34 (44.1)

12/41 (29.3)

0.182

Hospital stay, day^†

18.5 (14.0‒28.0)

12.9 (7.0‒21.0)

0.035

F/U period, months^†

36.3 (30.0‒39.0)

35.9 (29.0‒40.0)

0.512

Time interval from TKA to revision, years^†

4.7 (0.8‒8.0)

8.3 (1.5‒17.0)

0.031

2nd-stage revision, n (%)^*

34 (100.0)

–

< 0.001

Operation time, min^†

115. 9 (68.0‒138.0)

121.5 (85.0‒149.0)

0.107

PE thickness, mm^†

12.8 (8.0‒14.0)

12.5 (8.0‒16.0)

0.621

Pre-revision HKA angle, °^‡

− 5.9 ± 4.1

− 5.6 ± 3.9

0.560

Post-revision HKA angle, °^‡

− 2.1 ± 3.3

− 2.4 ± 3.7

0.379

Pre-revision PTSA, °^‡

3.3 ± 1.8

3.1 ± 1.9

0.780

Post-revision PTSA, °^‡

5.5 ± 2.6

5.2 ± 2.2

0.603

Component position, °^‡

 α angle

94.5 ± 3.8

94.9 ± 3.3

0.439

 β angle

90.5 ± 2.7

89.8 ± 2.4

0.713

 γ angle

3.2 ± 4.0

3.6 ± 4.3

0.527

 δ angle

87.5 ± 3.8

87.0 ± 3.7

0.626

Femoral JL position, mm^‡

 Pre-revision

41.0 ± 7.2

40.7 ± 6.3

0.481

 Post-revision

42.2 ± 6.6

42.9 ± 6.1

0.632

≥ 5 mm of femoral JL elevation, n (%)^*

1 (2.9)

3 (7.3)

0.401