BM	Bone-Marrow
BM-MSC	Bone-Marrow derived Mesenchymal Stem Cell
CB	Fetlocks injected with UCB-MSCs
CD	Cluster of Differentiation
CTX-II	C-terminal of type II collagen
FCS	Fetal Calf Serum
MHC	Major Histocompatibility Complex
MRI	Magnetic Resonance Imaging
MSC	Mesenchymal Stem Cell
NSAID	Non-steroidal anti-inflammatory drug
OA	Osteoarthritis
P4	Passage 4
PBS	Phosphate-Buffered Saline
PGE2	Prostaglandin E2
UCB-MSC	Umbilical Cord Blood derived Mesenchymal Stem Cell
UCB	Umbilical Cord Blood
W	Week