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Table 1 Gait parameters for optical tracking system (OTS) and inertial measurement units (IMU)

From: Validation of inertial measurement units with optical tracking system in patients operated with Total hip arthroplasty

 

OTS

IMU

Wilcoxon

Intraclass correlation

Mean

95% C.I.

Median

Mean

95% C.I.

Median

P-value#

ICC (CI)¤

Pelvic range degree

5.4

4.5–6.3

4.5

4.9*

4.4-5.3

4.6

0.95

0.08 (−0.20–0.35)

Hip ext./flex range right degree

36.8

35.2–38.5

36.2

34.0

32.2–35.9

33.4

< 0.001

0.75 (0.34–0.89)

Hip ext./flex range left degree

37.7

36.0–39.4

38.3

34.4

32.7–36.2

34.4

< 0.001

0.73 (0.22–0.89)

Knee ext./flex range right degree

55.1

53.5–56.7

55.0

54.9

53.1–56.6

53.9

0.75

0,83 (0,72-0,90)

Knee ext./flex range left degree

54.4

52.8–55.9

54.2

54.4

52.8–56.0

54.9

0.69

0.86 (0.77–0.92)

  1. *Mean of right and left side
  2. #P-values refer to Wilcoxon sign ranks test between OTS and IMU
  3. ¤Intraclass correlation coefficient (ICC) and 95% confidence interval (CI)