Table 35: Results of knee OA repeatability studies Prevalence per variable grade Intra-Kappa Inter-Kappa Knee OA Variable (grading system) N (%) score (k) score (k) Joint Space Narrowing (JSN) Lateral OARSI photographic atlas (0-3) 50 0=42%; 1=24%; 2=15%; 3=19% 0.7 0.29 Medial OARSI photographic atlas (0-3) 50 0=40%; 1=14%; 2=16%; 3=30% 0.7 0.49 -1=10%; 0=44%; 1=10%; 4=8%; 0.46 Lateral LDA JSN atlas (-1-5) 50 0.35 5=28% 0=36%; 1=12%; 3=8%; 4=14%; 50 0.63 0.33 Medial LDA JSN atlas (-1-5) 5=30% 50 0=60%; 1=23%; 2=7%; 3=10% 0.45 0.44 PFJ Joint space narrowing (0-3) (Lateral view) PFJ Lateral facet JSN LDA atlas (-1-5) (Skyline 0=72%; 1=7%; 2=5%; 3=3%; 50 0.63 0.45 view) 4=5%; 5=8% PFJ Medial facet JSN LDA atlas (-1-5) (Skyline -1=2%; 0=77%; 1=7%; 2=5%; 50 0.41 0.23 view) 3=5%; 5=4% Osteophyte Grade (OARSI atlas) 50 0=39%; 1=27%; 2=12%; 3=22% 0.45 0.26 Lateral femoral condyle osteophyte size (0-3)
Table 35: Results of knee OA repeatability studies Knee OA Variable (grading system) N Prevalence per variable grade (%) Intra-Kappa score (k) Inter-Kappa score (k) Joint Space Narrowing (JSN) Lateral OARSI photographic atlas (0-3) 50 0=42%; 1=24%; 2=15%; 3=19% 0.7 0.29 Medial OARSI photographic atlas (0-3) 50 0=40%; 1=14%; 2=16%; 3=30% 0.7 0.49 Lateral LDA JSN atlas (-1-5) 50 -1=10%; 0=44%; 1=10%; 4=8%; 5=28% 0.46 0.35 Medial LDA JSN atlas (-1-5) 50 0=36%; 1=12%; 3=8%; 4=14%; 5=30% 0.63 0.33 PFJ Joint space narrowing (0-3) (Lateral view) 50 0=60%; 1=23%; 2=7%; 3=10% 0.45 0.44 PFJ Lateral facet JSN LDA atlas (-1-5) (Skyline view) 50 0=72%; 1=7%; 2=5%; 3=3%; 4=5%; 5=8% 0.63 0.45 PFJ Medial facet JSN LDA atlas (-1-5) (Skyline view) 50 -1=2%; 0=77%; 1=7%; 2=5%; 3=5%; 5=4% 0.41 0.23 Osteophyte Grade (OARSI atlas) Lateral femoral condyle osteophyte size (0-3) 50 0=39%; 1=27%; 2=12%; 3=22% 0.45 0.26
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