| Re: spondylolysis/spondylothesis
Hi - These are related conditions. Spondylolysis is frequently asymptomatic and lots of people have it and don't even know. Spondylolysis is some type of defect in the connection between vertebrae. This defect can lead to small stress fractures in the vertebrae that can weaken the bones so much that one slips out of place, and then causes the condition called spondylolisthesis. Spondylolisthesis is a condition where one or more of the bones of the spine (vertebrae) slips out of place onto the vertebra below it. It they slip out too much they might press on a nerve causing pain. This problem is usually found in the lower back. Symptoms are things like lower back pain, possibly muscle spasms like in your hamstring, or nerve pain.
I would discuss it with your primary care dr.. Your doc might want to do some simple tests and keep an eye on it. They grade the slippage if you have it:
Grade I — 1 percent to 25 percent slip
Grade II — 26 percent to 50 percent slip
Grade III — 51 percent to 75 percent slip
Grade IV — 76 percent to 100 percent slip
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spondylolysis/spondylothesis 
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