What is spondylolysis? How serious is this?

A small crack. In a spine called th parsinterarticularis it a bridge of bone from th two joint to the support structure in th front with extension activities this can fail inlow energy they can range from causing no symptoms means no limits to nagging low back ache many people live a normal active life with them can be associated with spondylithesis spinal slip if aslip is present neural impingement and sciatica.