Table 2 Frequency of Accelerated or Rapid KOA Using Previously Reported Definitions Among Adults without Radiographic KOA at OAI Baseline

Accelerated OA [1, 3, 4]

KL 0 or 1 to KL 3 or 4

4 or 5 years

7.2%

Rapid Radiographic Change [47]

KL 0 or 1 then KL change > 2

4 or 5 years

12.4%

Fast JSW Loss [48]

> 0.25 mm medial JSW change

1 year

15.5 to 22.1%

Rapid Progressors [49]

> 1.05 mm medial JSW change

1 year

0.4 to 0.8%

Rapid Destructive Arthrosis [50]

> 2 mm JSW change or 50% narrowing

1 year

0%

Rapid Progressive OA Type 1 [46, 47]

> 2.00 mm JSW change

1 year

0%

Rapid Progressive OA Type 2 [46, 47]

abnormal bone loss or destruction

short period of time

0%