Table 5 Multivariable analysis results for the association between more than 130 degrees of knee flexion and patients’ quality of life after TKA

Knee flexion after TKA (°)

1.01 (1–1.02)

0.025

1.003 (0.993–1.013)

0.569

 No

1 (Reference)

1 (Reference)

 Yes

1.5 (1.12–2)

0.006

1.17 (0.872–1.569)

n.s.

 Kneel (reference: impossible)

Hard to do

0.96 (0.72–1.27)

n.s.

Easy to do

0.94 (0.55–1.62)

n.s.

 Squat (reference: impossible)

Hard to do

0.86 (0.65–1.14)

n.s.

Easy to do

1.09 (0.65–1.82)

n.s.

 Sit cross-legged (reference: impossible)

Hard to do

1.25 (0.92–1.7)

n.s.

1.039 (0.755–1.428)

n.s.

1.028 (0.748–1.413)

n.s.

Easy to do

2.97 (2.08–4.24)

< 0.001

1.787 (1.204–2.653)

0.004

1.74 (1.169–2.589)

0.006

 Stand from the floor (reference: impossible)

Hard to do

3.08 (1.38–6.87)

0.006

2.639 (1.172–5.942)

0.019

2.619 (1.163–5.898)

0.02

Easy to do

8.25 (3.59–18.98)

< 0.001

5.359 (2.267–12.668)

< 0.001

5.325 (2.252–12.589)

< 0.001

Age (years) (reference: <  60)

60 - < 75

1.25 (0.76–2.04)

0.38

≥ 75

1.14 (0.64–2.04)

n.s.

Male (vs. female)

2.28 (1.31–3.97)

0.004

2.379 (1.383–4.092)

0.002

2.388 (1.388–4.11)

0.002

Body mass index (kg/m²) (reference: <  25)

25 - < 30

1.21 (0.87–1.7)

n.s.

≥ 30

1.11 (0.71–1.74)

n.s.

Bilateral TKA (vs. unilateral TKA)

1.57 (1.15–2.15)

0.005

1.66 (1.22–2.259)

0.001

1.663 (1.222–2.262)

0.001

Patellar resurfacing (vs. un-resurfacing)

0.87 (0.6–1.27)

n.s.