Inclusion Criteria:  Obtained informed consent Adult patients (>18 years old) Primary osteoarthritis of knees scheduled for unilateral TKA  Exclusion Criteria:  Unable to obtain consent Refusal to continuous glucose monitoring Contraindication to dexamethasone Patients scheduled for one-staged bilateral Total Knee Arthroplasty (TKA) History of peptic ulcer/GI bleeding Hepatitis B carrier Patients on long-term steroid Patients requiring general anesthesia for the operation