Fig. 1

A 26-year-old male patient. a, b and c, preoperative lumbar CT showed extensive gout deposition in the lumbosacral region, destruction of adjacent vertebral bodies and attachments, protruding to the spinal canal, secondary L4–S1 spinal canal stenosis and compression of bilateral nerve roots. d and e, huge gout was showed during the operation. f, postoperative pathology showed spinal gout stone crystallization. g, one year after operation, CT showed that there was no gout deposition and no loosening of screws. h and i, X-ray examination showed no loosening of screws 1 year after operation. There was one screw tail cap loosening