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Table 3 Inter- and intra-observer agreement of the six methods used, before and after total knee arthroplasty

From: A new method for evaluation of patellar height and the position of the joint line before and after total knee arthroplasty

  Pre-operation Post-operation
IS mIS CD BP AP jAP JLH IS mIS CD BP AP jAP JLH
Intra-observer agreement
 ICC 0.92 0.78 0.73 0.79 0.85 0.83 0.80 0.92 0.71 0.87 0.87 0.87 0.87 0.92
 95% confidence interval 0.87–0.95 0.68–0.84 0.63–0.81 0.70–0.86 0.78–0.89 0.75–0.88 0.71–0.86 0.88–0.94 0.60–0.75 0.81–0.91 0.81–0.91 0.80–0.91 0.80–0.91 0.89–0.95
P value 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
 Sample size 100 100 100 100 100 100 100 100 100 100 100 100 100 100
Inter-observer agreement
 ICC 0.85 0.69 0.68 0.81 0.83 0.82 0.88 0.86 0.54 0.86 0.83 0.83 0.86 0.95
 95% confidence interval 0.79–0.90 0.58–0.78 0.56–0.77 0.73–0.87 0.75–0.88 0.74–0.87 0.82–0.91 0.76–0.91 0.37–0.67 0.81–0.90 0.76–0.88 0.76–0.88 0.80–0.90 0.93–0.97
P value 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
 Sample size 110 110 110 110 110 110 110 110 110 110 110 110 110 110
  1. ICC Intraclass correlation coefficient, IS Insall-Salvati, mIS Modified Insall-Salvati, BP Blackburne-Peel, CD Caton-Deschamps, AP Axis-patella, jAP Joint axis-patella, JLH Height of the joint line