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Table 2

Intraobserver and inter-observer coefficients for the evolution of patellar tracking.

Intra observer ICC Agreement Inter observer ICC Agreement
Sagittal 0° 0.83 Excellent 0.81 Excellent
Sagittal 10° 0.62 Very good 0.63 Very good
Sagittal 20° 0.61 Very good 0.60 Very good
Sagittal 30° 0.76 Very good 0.70 Very good
Sagittal 40° 0.72 Very good 0.69 Very good
Sagittal 50° 0.71 Very good 0.73 Very good
Sagittal 60° 0.82 Excellent 0.80 Excellent
Sagittal 70° 1 Excellent 1 Excellent
Sagittal 80° 1 Excellent 1 Excellent
Sagittal 90° 1 Excellent 1 Excellent
Coronal 30° 0.74 Very good 0.75 Very good
Coronal 70° 0.83 Excellent 0.79 Very good
Coronal 90° 0.84 Excellent 0.81 Excellent

Note: The strength of agreement for the kappa coefficient was interpreted as follows: < 0.20 = unacceptable, 0.20–0.39 = questionable, 0.40–0.59 = good, 0.60–0.79 = very good, and 0.80–1 = excellent.

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