"Grafting" is a surgical procedure in which tissue is totally removed from the body and transferred to another area. The transferred tissue may be skin, cartilage, or bone. The success of such an undertaking is dependent upon the body's ability to regenerate good circulation for the transferred tissue from the bed of tissue which will support or surround it. Thus, the surgeon must be convinced that the site in which the graft will be placed is healthy and well supplied with blood vessels.

Since it will take even healthy tissue some time to "grow" new blood vessels into a graft, the amount of tissue which can be transferred is relatively limited. Until the vascular in growth occurs, the graft must be able to survive on the nourishment provided by diffusion from within the bed. Tissue layers will then follow.