Bone morphogenetic proteins (BMPs) are introduced into an affected
intervertebral disc without the inclusion of disc cells. The inventions applies to all known and yet-to-be developed or discovered BMPs, including BMP-1, -2, -3, -4, -5, -6, -7, -8, -9, -10, . . . BMPn. The BMP(s) may be obtained from natural and / or recombinant sources. The BMP(s) may be introduced using any surgical technique, including
percutaneous or laparoscopic approaches. As one delivery mechanism, a passageway may be formed through the annulus, with the substances then being introduced through the passageway. Alternatively, a carrier may be sewn or otherwise adhered to the inside or outside of the existing annulus using standard
surgical procedures. Additional therapeutic substances such as culture medium, growth factors, differentiation factors, hydrogels, polymers,
antibiotics, anti-inflammatory medications, or immunosuppressive medications could be introduced in conjunction with the BMP(s).