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

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 amount^a

0 = absent

1 = <10% of surface area

1 = mild

1 = <10% of bone volume

1 = small^b

1 = present

2 = 10 to 75% of surface area

2 = moderate

2 = 10 to 25% of bone volume

2 = medium^c

3 = >75% of surface area

3 = severe

3 = >25% of bone volume

3 = large^d

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