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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
95% CI %agreement 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