Disclosed embodiments provide for treatment of the anulus fibrosus (AF) and intevertebral disc (IVD), including herniated discs, anular tears of the disc, or disc degeneration, while enabling surgeons to contain blood, fluid, proteins, or other materials that are placed into or migrate into or near defective regions of the spine. The invention also concentrates mesenchymal stem cells (MSCs) in the surgical area and increases the area of bone to be fused. Other aspects of the invention may be used to raise the temperature of tissues, including surgical tissues, to stimulate inflammation, thereby stimulating tissue healing. According to these embodiments, the invention places a heating element below the skin and adjacent to the tissue to stimulate the healing thereof.