Table 1. Classification of degenerative changes in OA model based on quantitative SHG imaging.

SD value	Hyperplasia of hyaline tissues	Hyperplasia of fibrous cartilage	Exposure of subchondral bone	Total
Low-SD group (#3,4,5,7)	4 (#3,4,5,7)	0	0	4
High-SD group (#1,2,6,8)	0	2 (#2, 8)	2 (#1, 6)	4