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Table 4 Intra-observer reliability for reading of MRI BLOKS features (weighted kappa)

From: The Intensive Diet and Exercise for Arthritis (IDEA) trial: design and rationale

BLOKS feature Reliability
(weighted kappa)
BML size 0.72
BML % area 0.67
% of lesion BML 0.79
Cartilage 1 morphology 0.95
Cartilage 2 0.93
Osteophyte 0.74
Synovitis 0.66
Effusion 0.77
Meniscal extrusion 0.95
Meniscus tear/cysts 0.99
  1. BLOKS = Boston Leeds Osteoarthritis Knee Score
  2. BML = Bone Marrow Lesion