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Table 3 Inter-observer reliability of the MRI measurements for patellar instability

From: Patellar instability: the reliability of magnetic resonance imaging measurement parameters

Measurement ICC 95%CI Mean difference 95%LoA SEM MDC95
Patellar position
 Angle of Fulkerson, deg 0.975 0.961~0.983 0.275 −1.717~2.266 0.732 2.029
 Angle of Grelsamer, deg 0.870 0.814~0.910 −0.157 −4.695~4.381 1.632 4.523
 Angle of Laurin, deg 0.931 0.897~0.954 0.480 −3.081~4.042 1.320 3.658
 PTA, deg 0.952 0.930~0.968 −0.039 −2.411~2.332 0.854 2.367
 LPD, mm 0.979 0.969~0.986 −0.087 −0.916~0.741 0.303 0.840
 BSO, % 0.923 0.887~0.948 −0.004 −0.040~0.033 0.013 0.037
 CA, deg 0.906 0.864~0.935 −0.392 −11.146~10.362 3.774 10.460
Trochlear dysplasia
 SA, deg 0.963 0.946~0.975 −0.137 −3.919~3.645 1.366 3.786
 LTI, deg 0.963 0.939~0.977 −0.392 −2.549~1.765 0.819 2.272
 TFA, % 0.822 0.748~0.876 −0.008 −0.146~0.130 0.050 0.138
 TGD, mm 0.931 0.900~0.953 0.011 −0.972~0.994 0.353 0.979
Patellar height
 ISI 0.821 0.725~0.886 −0.006 −0.152~0.141 0.052 0.145
 MISI 0.879 0.810~0.923 0.005 −0.189~0.199 0.069 0.191
 CDI 0.909 0.957~0.943 −0.001 −0.114~0.112 0.040 0.112
 BPI 0.885 0.820~0.927 0.010 −0.145~0.165 0.056 0.154
 PTI 0.956 0.930~0.973 0.008 −0.088~0.103 0.034 0.095
  1. ICC Intraclass correlation coefficient, LoA Limits of agreement, CI Confidence interval. SEM: standard error of measure, MDC95 Minimal detectable change at 95% confidence level, deg degree
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