Calcitonin gene-related peptide (CGRP) levels are elevated in the plasma and knee synovial fluid of patients with knee osteoarthritis (OA). (April 2016) - McNearney, T.; Chai, X.; Xu, J.; Chang, C.-Y.; Collins, E.; Cox, K.; Anderson, W.; Mitchell, P.; Talbot, J.; Dage, J.; Miller, B.; Johnson, K.