Spondylolysis
Spondylolysis is a small crack in a part of the vertebra of the spine known as the pars interarticularis. 40–45% of the population may have spondylolysis, often alongside spondylolisthesis and slip disc

Symptoms
Mild to severe pain in the lower back, buttocks, back of the thigh, calf and foot
Pain in the neck, upper back, shoulder, hands and fingers
Difficulty or increasing pain with lifting and bending
Worsening pain when resting, sitting, walking or standing
Back or neck pain that comes and goes intermittently
Morning stiffness and pain that may increase or reduce with movement
Pain radiating from the buttocks or down one or both legs
Tingling, numbness, burning, weakness or imbalance in legs and feet
Difficulty urinating or passing motion (reduced bowel and bladder control)