AAOS	American Academy of Orthopedic Surgeons
ACR	American College of Rheumatology classification criteria
ACS	Autologous Conditioned Serum
ARA	American Rheumatism Association
CG	Control Group
CI	Confidence Interval
HA	Hyaluronic Acid
IG	Intervention Group
KL	the Kellgren Lawrence classification
KOA	Knee Osteoarthritis
KOOS	the Knee Injury and Osteoarthritis Outcome Score
MSC	Mesenchymal Stem Cell
NSAIDs	Non-Steroidal Anti-Inflammatory Drugs
OARSI	Osteoarthritis Research Society International
PRP	Platelet-Rich Plasma
RCT	Randomized Controlled Trial
SMD	Standardized Mean Difference
TCE	TCE
WMD	Weighted Mean Difference
WOMAC	the Western Ontario and McMaster Universities Osteoarthritis Index