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