This study is to prospectively measure and compare anabolic, anti-inflammatory, and proinflammatory growth factors, cytokines,
and chemokines in bone marrow aspirate (BMA), BMC, whole blood, leukocyte-poor PRP (LP-PRP), and leukocyte-rich PRP
(LR-PRP) from samples collected and processed concurrently on the same day from patients presenting for elective knee surgery.