<unk>  is a defect or stress fracture in the pars interarticularis of the vertebral arch. The vast majority of cases occur in the lower lumbar vertebrae (L5), but<unk>  may also occur in the cervical vertebrae.
Spondylolysis
Spondylosis
Spondylosis deformans
Spondylitis
Osteoarthritis
Spondyloarthropathy
Ankylosing spondylitis
Spondylodiscitis