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Table 1 Magnetic resonance imaging assessment, according to Boston-Leeds Osteoarthritis Knee Score [42]

From: Biomechanical factors and physical examination findings in osteoarthritis of the knee: associations with tissue abnormalities assessed by conventional radiography and high-resolution 3.0 Tesla magnetic resonance imaging

   Cartilage integrity Osteophytes Bone marrow lesions Effusion Synovitis
Assessment   Size of any cartilage thickness loss (both partial and full thickness loss) as percentage of cartilage surface area of each region Size of protuberance of osteophyte Size of BML (including volume of any associated cysts) as percentage of bone volume of each region Size of effusion within synovial space Presence of synovitis
Region Number 8 12 9 1 (one score for whole knee) 5
  MTF Medial weight-bearing femur Medial weight-bearing femur Medial weight-bearing femur - -
   Medial region tibia Medial posterior region femur Medial region tibia   
    Medial region tibia    
  LTF Lateral weight-bearing femur Lateral weight-bearing femur lateral weight-bearing Femur - -
   Lateral region tibia Lateral posterior region femur Lateral region tibia   
    Lateral region tibia    
  PF Medial region patella Superior region patella Medial region patella - -
   Lateral region patella Inferior region patella Lateral region patella   
   Medial trochlea femur Medial region patella Medial trochlea femur   
   Lateral trochlea femur Lateral region patella Lateral trochlea femur   
    Medial trochlea femur    
    Lateral trochlea femur    
  Other - - Subspinous region tibia - Hoffa's fat pad (infrapatellar)
       Medial posterior-condylar region
       Lateral posterior-condylar region
       Medial recess
       Lateral recess
Score (per region)   0 = none 0 = none 0 = none 0 = physiological amounta 0 = absent
   1 = <10% of surface area 1 = mild 1 = <10% of bone volume 1 = smallb 1 = present
   2 = 10 to 75% of surface area 2 = moderate 2 = 10 to 25% of bone volume 2 = mediumc  
   3 = >75% of surface area 3 = severe 3 = >25% of bone volume 3 = larged  
Details    An osteophyte must be visible on two consecutive slices. Largest osteophyte within region scored If BML span more than one region, then full size of BML is attributed to region that is most involved   
  1. BML, bone marrow lesions; LTF, lateral tibiofemoral compartment; MTF, medial tibiofemoral compartment; PF, patellafemoral compartment. aIn supra-patellar bursa only. bFluid continuous in retropatellar space. cWith slight convexity of suprapatellar bursa. dEvidence of capsular distention.