The association between subchondral bone cysts and tibial cartilage volume and risk of joint replacement in people with knee osteoarthritis: a longitudinal study

Table 2 Natural history of subchondral bone cysts

	Whole population (n = 109)	No BML or cyst at baseline (n = 36)	BML at baseline (n= 21)	Cyst at baseline (n = 52)
	No. (%)^a	No. (%)^b	No. (%)^c	No. (%)^d
Develop	6 (6.8)	0	6 (40.0)	N/A
Progress	21 (23.9)	N/A	N/A	15 (35.7)
Regress	10 (11.4)	N/A	N/A	10 (23.8)
Resolve	6 (6.8)	N/A	N/A	6 (14.3)
Stable	17 (19.3)	N/A	N/A	17 (40.5)

BML, bone marrow lesion; N/A, not applicable. ^a88 subjects; ^b31 subjects; ^c15 subjects; and ^d42 subjects of each subgroup participated in the follow-up; thus, the percentages were calculated accordingly.

ISSN: 1478-6362