Table 1.

Radiographic grading scale

Radiographic OA feature of the medial compartment		Grade 0	Grade 1	Grade 2	Grade 3
Joint space width		Normal	Reduced	Absent	NA
Osteophytes	Medial tibial condyle	Absent	Small	Moderate	Severe
	Medial femoral condyle	Absent	Small	Moderate	Severe
	Medial fabella	Absent	Present		NA
Total osteophytes				0-7
Global ROA score				0-9