Up to 25%: Grade 1 means that the forward slippage of L4 is up to one quarter (25%) of the top of the L5 vertebra. So if the top of L5 front to back is 50 mm, the forward slip of L4 is more than zero and less than 12.5 mm.
Answered 10/3/2018
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Slip of the spine: The lumbar region of the lower back has five vertebra: L1 -l5. The lowest portion is at the very bottom of your spine where it connects to the pelvis. This is a common area for slippage. Poor posture, weak stomach muscle, heavy lifting, too much sitting all lead to this slippage. X-rays and mris may show this change, and you may have lots of low back pain. The spinal cord is not affected.
Answered 3/17/2019
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