ANOVA	Analysis of variance
BMSC	Bone marrow mesenchymal stem cells
CCM	Cell-free stem cell-derived extract
CKs	Cytokines
ECM	Extracellular matrix
ELISA	Enzyme linked immunosorbent assay
EGFR	Epidermal growth factor receptor
EVs	Extracellular vesicles
GFs	Growth factors
GH	Growth hormone
IGF-1	Insulin-like growth factor-1
IGFBP	Insulin-like growth factor binding protein
IL-1RA	Interleukin 1 receptor antagonist
MSCs	Mesenchymal stem cells
OS	Osteoarthritis
PDGF-AA	Platelet derived growth factor-AA
SP-IRIS	Single particle interferometric reflectance imaging sensing
SEM	Standard error of mean
TGFα	Transforming growth factor alpha
TGFβ1	Transforming growth factor beta-1
VEGF	Vascular endothelial growth factor