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Table 1 Frequency (n) of structural abnormalities on adjudicated reading of baseline fixed flexion radiographs

From: Relationship of compartment-specific structural knee status at baseline with change in cartilage morphology: a prospective observational study using data from the osteoarthritis initiative

  Grade 0 Grade 1 Grade 2 Grade 3
Medial joint space narrowing 70 46 35 5
Lateral joint space narrowing 130 14 10 2
Medial tibia osteophyte 51 73 23 9
Medial femoral osteophyte 77 20 20 39
Medial subchondral tibial sclerosis 103 32 17 4
Medial subchondral femoral sclerosis 100 35 16 5
Medial tibial cysts 142 14 - -
Medial femoral cysts 155 1 - -
Medial chondrocalcinosis 139 17 - -
Medial tibial bone attrition 154 2 - -