ACI	Autologous chondrocyte implantation
COLI	Collagen type I
COLII	Collagen type II
CPM	Continuous passive motion
ED	Empty defect
EGM	Endothelial growth medium
EPC	Endothelial progenitor cell
ES	Extent score
GAG	Glycosaminoglycan
GEE	Generalized estimating equations
IHC	Immunohistochemistry
IS	Intensity of staining
MACI	Matrix-induced ACI
MSC	Mesenchymal stem cell
OA	Osteoarthritis
OCT	Osteochondral transplantation
ROI	Region of interest
SEM	Standard error of the mean
TKA	Total knee arthroplasty