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Table 4 Inter-scan 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 0.836 0.729~0.903 0.294 −5.071~5.659 1.918 5.315
 Angle of Grelsamer, deg 0.325 0.054~0.550 −0.333 −10.591~9.924 3.674 10.184
 Angle of Laurin, deg 0.723 0.559~0.832 1.020 −6.413~8.452 2.732 7.573
 PTA, deg 0.897 0.828~0.940 −0.216 −3.729~3.297 1.262 3.497
 LPD, mm 0.726 0.564~0.834 −0.092 −3.199~3.014 1.108 3.072
 BSO, % 0.827 0.716~0.897 0.003 −0.051~0.057 0.020 0.054
 CA, deg 0.380 0.128~0.588 4.118 −22.647~30.882 9.873 27.367
Trochlear dysplasia
 SA, deg 0.887 0.808~0.934 0.902 −5.845~7.649 2.476 6.864
 LTI, deg 0.915 0.855~0.951 −0.412 −3.811~2.987 1.242 3.443
 TFA, % 0.793 0.663~0.876 −0.007 −0.157~0.143 0.054 0.149
 TGD, mm 0.881 0.801~0.930 −0.127 −1.415~1.162 0.467 1.295
Patellar height
 ISI 0.700 0.481~0.837 −0.019 −0.206~0.169 0.068 0.188
 MISI 0.728 0.520~0.854 −0.013 −0.318~0.292 0.108 0.299
 CDI 0.903 0.815~0.951 0.000 −0.113~0.113 0.040 0.111
 BPI 0.820 0.671~0.906 −0.018 −0.217~0.180 0.071 0.198
 PTI 0.655 0.373~0.819 0.069 −0.194~0.333 0.099 0.274
  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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