Scoring category	Observations	Score
	Menisci calcification	None	0
		1	1
		2	2
Number of visible osteophytes	Medial tibial condyle	None	0
		Low- Moderate	1
		Moderate- Severe	2
	Medial femoral condyle	None	0
		Low- Moderate	1
		Moderate- Severe	2
	Medial fabella	Absence	0
		Presence	1
	Structural modifications of subchondral bone (sclerosis)	None	0
		Low- Moderate	1
		Moderate- High	2
	Width of the joint space	Normal	0
		Reduced	1
		Absent	2
	Calcification of tendons and ligaments	None	0
		1 site	1
		>1 site	2
		Total	13