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Table 1 MRI Assessment Criteria

From: Empirical evaluation of the inter-relationship of articular elements involved in the pathoanatomy of knee osteoarthritis using Magnetic Resonance Imaging

Articular Element MRI Scoring Analysis/Classification
Cartilage Two step process for each joint surface: Cartilage signal summarized as:
     1. Grade degree of cartilage damage: 0-None = normal
  0 = Normal 1-Mild = heterogeneity or fraying
  1 = Increased signal heterogeneity without surface disruption 2-Moderate = fissuring or thinning < 50%
  2 = Fraying (superficial only) 3-Severe = thinning > 50% or full thickness
  3 = Fissuring (full thickness lesions <1 mm in width) Lesion size summarized as:
  4 = Thinning <50% cartilage thickness 0-None = normal
  5 = Thinning >50% cartilage thickness 1-Mild = < 1 cm
  6 = Full thickness cartilage loss 2-Moderate = 1-2 cm
     2. Score greatest diameter of greatest severity lesion 3-Severe = > 2 cm
  0 = Normal Cartilage signal and lesion size scores summed over 17 regions to give hypothetical range 0-102.
  1 = <1 cm None = 0
  2 = 1-2 cm Mild = 1-30
  3 = 2-3 cm Moderate = 30-60
  4 = >3 cm Severe = > 60
Osteophytes Two step process for each joint compartment: Compartmental scores (medial, lateral, patellofemoral) were summed for the whole knee. The possible score range was 0-9. Final assessment of osteophytosis:
     1. Grade individual osteophytes according to the size of the greatest dimension: None = 0
  0 = <1 mm Mild = 1-3
  1 = 1-2 mm Moderate = 4-5
  2 = 2-5 mm Severe = 6+
  3 = >5 mm  
     2. Sum scores of all individual osteophytes to give compartmental score:  
  0 = normal individual sum 0  
  1 = mild individual sum 1-2  
  2 = moderate individual sum 3-4  
  3 = severe individual sum >4  
Bone Marrow Lesions Greatest diameter of each lesion recorded for both femoral and tibial surfaces as well as the patellofemoral compartment: Scores for patellofemoral compartment and femoral and tibial surfaces were summed. The possible score range was 0-15. Final assessment of bone marrow lesions:
  0 = None None = 0
  1 = Mild (<0.5 cm) Mild = 1-3
  2 = Moderate (0.5-1.5 cm) Moderate = 4-5
  3 = Severe (>1.5 cm) Severe = 6+
Effusion Greatest diameter of the effusion perpendicular to the long-axis of the leg: Effusion was recorded as a single score for the whole knee. No changes were made for final analysis.
  0 = None (0.0-0.5 cm fluid)  
  1 = Mild (0.5 -- 1.0 cm fluid)  
  2 = Moderate (1.0 -- 2.0 cm fluid)  
  3 = Severe (>2.0 cm fluid)  
Synovitis Assessed by counting the number of thickened villi seen on T2-weighted sequences Synovitis was recorded as a single score for the whole knee. No changes were made for final analysis.
  0 = None (<5 villi seen, all normal thickness)  
  1 = Mild (6-10 villi seen, some thickened)  
  2 = Moderate (11-15 villi seen, mostly thickened)  
  3 = Severe (> 15 villi seen, marked thickening)  
Subchondral Sclerosis For each compartment: Final score determined by number of the 3 knee compartments with evidence of sclerotic change
  0 = Absent 0 = Absent
  1 = Present 1 = Mild
   2 = Moderate
   3 = Severe
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