Fig. 1From: Minimal invasive annulotomy for induction of disc degeneration and implantation of poly (lactic-co-glycolic acid) (PLGA) plugs for annular repair in a rabbit modelSchematic illustration of experimental instruments. The defect (Ø 1.8 mm; depth 4 mm) was created in the annulus wall using a mini-trephine. The depth of drilling was controlled by a scale mark (a); a delivery T-cannula was used for the implantation by press-fitting (b)Back to article page