A standard rotator cuff repair will be completed utilizing a medial row Healicoil and a lateral row PEEK anchor. At the time of drilling for the anchors, bone marrow aspirate will be collected by turning off the water and using a large gauge biopsy needle to aspirate the contents of the drill hole. The anchors will then be placed. The aspiration process is then repeated and a smaller gauge needle will be used to aspirate within the open construct of the Healicoil anchor. All material will be sent to the laboratory of Dr. Chubinskaya for immediate analysis of: