This study involves research. The purpose of this research is to formally investigate the hemostatic efficacy of epinephrine to minimize blood loss after total joint arthroplasty. It is unclear if using intra-articular injections of epinephrine in total joint replacement is associated with a decrease in post-operative blood loss. The initial hypothesis is: the use of intra-articular injection of epinephrine is associated with decreased post-operative blood loss.