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Table 2 Ankle, knee and hip angles (mean ± SD)

From: A comparison of gait biomechanics of flip-flops, sandals, barefoot and shoes

Variables

Barefoot

Sandals

Flip-flops

Shoes

F

p

Foot contact angle (°)

19.2 ± 3.4

24.9 ± 3.6*

25.5 ± 3.9*

29.5 ± 4.5*#&

27.6

< 0.001

Ankle contact angle (°)

-3.9 ± 3.9

-0.1 ± 4.5*

0.4 ± 5.0*

3.7 ± 3.8*#

14.5

0.001

Ankle plantarflexion ROM in early stance (°)

8.0 ± 1.9

9.4 ± 1.7*

8.7 ± 1.4

11.8 ± 2.9*#&

17.3

0.001

Peak ankle dorsiflexion in late stance (°)

6.1 ± 4.1

4.6 ± 4.2*

5.2 ± 4.0*

11.3 ± 4.0*#&

10.6

0.009

Ankle eversion ROM (°)

-4.9 ± 1.5

-5.1 ± 2.4

-5.4 ± 2.3

-6.5 ± 3.1

1.7

0.200

Knee contact angle (°)

-8.0 ± 3.9

-6.3 ± 3.9*

-6.3 ± 3.7*

-5.2 ± 3.4*

7.8

0.001

Knee flexion ROM in stance (°)

39.9 ± 5.3

45.8 ± 4.8*

44.1 ± 4.7*#

46.7 ± 4.4*&

34.6

<0.001

Peak hip extension in stance (°)

-10.5 ± 4.7

-11.8 ± 5.1

-11.3 ± 4.5

-12.5 ± 3.2

1.0

0.39

  1. * significantly different from barefoot, # significantly different from sandals, and & significantly different from flip-flops. Foot contact angle is defined as the angle between the foot and ground at heel strike, and a smaller foot angle refers to a more parallel angle of the foot relative to ground; a negative angle refers to plantarflexion and eversion for ankle, flexion for knee, and extension for hip.