Provided herein is a method for the repair of damaged tissue present at or on the surface of bone in an animal, the method comprising forming a narrow groove around at least part of said damaged tissue, which groove extends into the bone below the damaged tissue, replacing the tissue around which the groove extends by at least one layer of biocompatible replacement material, and anchoring the material to the bone using a retainer extending from the material into the groove; instruments for use in the repair of damaged tissue and kits comprising said instruments.