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Table 1 Accuracy of the investigated acetabular cup component within a phantom-model and a performed relative motion protocol

From: Model-based roentgen stereophotogrammetric analysis using elementary geometrical shape models: 10 years results of an uncemented acetabular cup component

 

RSA Translation [mm]

EGS Translation [mm]

set-point [mm]

x

y

z

x

y

z

 

mean

0.50

0.48

0.51

0.49

0.48

0.44

0.5

SD

0.03

0.05

0.08

0.03

0.05

0.18

bias

0.00

−0.02

0.01

−0.01

− 0.02

− 0.06

95% CI (↓)

−0.05

− 0.08

− 0.12

−0.04

− 0.08

−0.27

95% CI (↑)

0.08

0.13

0.20

0.06

0.13

0.43

mean

1.49

1.47

1.52

1.49

1.47

1.49

1.5

SD

0.02

0.06

0.05

0.04

0.06

0.25

bias

−0.01

−0.03

0.02

−0.01

−0.03

−0.01

95% CI (↓)

−0.01

0.00

−0.02

−0.02

− 0.03

−0.12

95% CI (↑)

0.08

0.22

0.17

0.15

0.20

0.86

  1. After taking RSA image pairs of the reference setup, using a spring-loaded micrometer, stepwise increments of 0.5 up to 1.5 mm (set-point value for single translation along each axis) of the cup along the x-, y- and z-axis was performed. At each step a RSA image pair was taken. This protocol was repeated n = 8 times. RSA image pairs were analysed by marker-based RSA and model-based EGS-RSA
  2. SD standard deviation, bias difference between mean value and set point value, CI confidence interval with upper (↑) and lower (↓) limit
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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