What is the difference between spondylolysis and spondylolisthesis on an x-ray?
1) Spondylolysis is the fracture or defect in the pars interarticularis, while spondylolisthesis is the forward displacement of one vertebra over another
2) Spondylolysis is the forward displacement of one vertebra over another, while spondylolisthesis is the fracture or defect in the pars interarticularis
3) Spondylolysis and spondylolisthesis are the same condition
4) Spondylolysis and spondylolisthesis are unrelated conditions