Under this study, we would like to collect specimens from CP patients who will undergo pancreatic resection at the VA Hospital for in vitro experiments. In these experiments, we will determine whether immune cells from CP patients are different from cells from healthy donors purchased from ATCC or other commercial sources. We will then assess whether pre-culture of immune cells from CP patients with MSCs can shift them to less pro-inflammatory phenotypes that won't induce inflammation in neuronal cells. All studies will be done in vitro in the cell culture system. Exploring mechanisms that contribute to chronic pain is vital for veterans' health and VA healthcare.

The purpose of this study is to collect and evaluate clinical and radiographic outcomes data on patients who have undergone, or will undergo, shoulder replacement surgery. Patients who receive a device from the Equinoxe® Shoulder System, manufactured and distributed by Exactech, Inc as well as patients who receive a device from another shoulder arthroplasty system may be included in this study.