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Table 5 Inter- and intrarater reliability; Krippendorff’s alpha (Kα), %agreement and intraclass correlation coefficient (ICC)a

From: Insall proximal realignment with/without tibial tubercle osteotomy for recurrent patellar instability yields acceptable medium- to long-term results but risk of osteoarthritis progression is considerable

 

Interrater reliability

Intrarater reliability

Kα

95% CI

%agreement

Kα

95% CI

%agreement

Iwano

0.62

0.45–0.78

67.8%

0.70

0.55–0.83

73.1%

OBC

0.65

0.43–0.83

65.9%

0.72

0.60–0.83

61.4%

 

ICC

  

ICC

  

LTI

0.92

0.86–0.96

N/A

0.95

0.92–0.97

N/A

TT-TG

0.89

0.81–0.94

N/A

0.91

0.85–0.95

N/A

CDI

0.72

0.53–0.84

N/A

0.80

0.67–0.89

N/A

  1. aOBC Oswestry Bristol Classification, LTI Lateral trochlear inclination, TT-TG Tuberositas tibia - trochlear groove distance, CDI Caton–Deschamps index