Fig. 1
From: Infrapatellar fat pad area on knee MRI: does it correlate with the extent of knee osteoarthritis?
The Kellgren- Lawrence radiographic osteoarthritis grading scale. a Mild osteoarthritis with small osteophites (arrows) and possible medial joint space narrowing (bold arrow). b Severe osteoarthritis with large osteophites (white arrow), marked joint space narrowing (black arrow), and subchondral sclerosis (astride)