Imaging features in incident radiographic patellofemoral osteoarthritis: the Beijing Shunyi osteoarthritis (BJS) study

Table 2 Imaging indicator grade progress of incident RPFOA in 3 years

Progress of Imaging Indicator Grades
	0	1		2		3
LJSN, n (%)	108 (77.7)	0–1*	12 (8.6)	0–2*	8 (5.8)	None
LJSN, n (%)	108 (77.7)	1–2*	9 (6.5)	1–3*	2 (1.4)	None
MJSN, n (%)	132 (95.0)	0–1*	6 (4.3)	0–2*	1 (0.7)	None
LPOST, n (%)	35 (25.2)	0–1*	13 (9.4)	0–2*	36 (25.9)	0–3*	1 (0.7)
LPOST, n (%)		1–2*	54 (38.8)	0–2*	36 (25.9)	0–3*	1 (0.7)
MPOST, n(%)	89 (64.0)	0–1*	19 (13.7)	0–2*	18 (12.9)	None
MPOST, n(%)	89 (64.0)	1–2*	13 (9.4)	0–2*	18 (12.9)	None

*Indicates that the progress of each imaging indicator grade of the RPFOA radiographs increases from 0 to 1 (from 1 to 2, from 1 to 3, or from 0 to 3)
Abbreviations. LJSN lateral joint space narrowing; MJSN medial joint space narrowing; LPOST lateral patellofemoral osteophyte; MPOST medial patellofemoral osteophyte

ISSN: 1471-2474