Skip to main content

Table 1 Grading for cartilage, ligaments, bone marrow edema, and subchondral cyst

From: Study of surgical indication for knee arthroplasty by cartilage analysis in three compartments using data from Osteoarthritis Initiative (OAI)

Cartilage Grade 0: normal, 1: signal heterogeneity, 2: fraying, 3: fissuring, 4: thinning<50%,
  5: thinning>50%, 6: full thickness cartilage loss
  Size 1: <10 mm, 2: <20 mm, 3:>20 mm
Ligaments Grade 0: normal, 1: sprain, 2: partial tear, 3: complete tear
Bone marrow edema Grade 0: absent, 1: mild (<1 cm), 2: moderate (1–2 cm), 3: severe (>2 cm)
Subchondral cyst 1. Grade the size of each individual subchondral cyst according to the grading templates:
Grade 1: mild (1-3 mm), 2: moderate (>3-6 mm), 3: severe (>6 mm)
2. The sum of individual subchondral cyst grades in each compartment gives total score:
Score 0: no subchondral cyst (0) 1: mild subchondral cysts (1–2) 2: moderate subchondral cysts (3–4) 3: severe subchondral cysts (>5)