Spondylolisthesis 椎间滑脱
Spondylolisthesis is the forward displacement of a vertebra, especially the fifth lumbar vertebra, most commonly occurring after a fracture. Backward displacement is referred to as retrolisthesis.
The variant "olisthesis," resulting from division of this compound word, is sometimes applied in conjunction with scoliosis. These "slips" occur most commonly in the lumbar spine. Spondylolysis (a defect or fracture of the pars interarticularis of the vertebral arch) is the most common cause of spondylolisthesis, which should not be confused with a spinal disc herniation (often misleadingly referred to as a "slipped disc"), in which one of the spinal discs in between the vertebrae has ruptured.