Table 1.

Grading system of radiological assessment

Radiographic OA feature of the medial compartment		Grade 0	Grade 1	Grade 2	Grade3
Joint space width		Normal	Reduced	Absent	NA
Osteophyte	Medial tibial condyle	Absent	Small	Moderate	Severe
	Medial femoral condyle	Absent	Small	Moderate	Severe
	Medial fabella	Absent	Present		NA
Total osteophytes				0-7
Global OA score				0-9