[Retracted] Multicentre Study Using Machine Learning Methods in Clinical Diagnosis of Knee Osteoarthritis

Table 1

Description and imageological features of Kellgren-Lawrence (K-L) grade.

Kellgren-Lawrence (K-L) grading scale
Classification	Grade 0 normal	Grade 1 doubtful	Grade 2 mild	Grade 3 moderate	Grade 4 severe
Description	No signs of OA	Mild osteophyte: normal joint space	Specific osteophyte: normal joint space	Moderate joint space reduction	Joint space greatly reduced: subchondral sclerosis
X-ray image