Fig. 6

Several types of device failure are shown. a Dislocation of the whole device posterior into spinal canal. Patient underwent rediscectomy and ACD removal. b Device material failure: fracture of the titanium anchor-head and dislocation toward spinal canal. Rediscectomy and anchor head and mesh removal was performed. c Posterior dislocation of polymer mesh into spinal canal. A LMD and mesh removal was performed during revision surgery. d Intraoperative picture of removed ACD device. e Radiological appearance of mesh subsidence into EPC and vertebra osteolysis. Clinically asymptomatic finding, no reoperation necessary to-date. f ACD failure: symptomatic recurrent disc herniation at the index level leading to a reoperation with LMD only