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Posterior Slip of L5 on S1


I'm a 35 year old male, and have had on off low back pain for about three years. I've recently been diagnosed through MRI scan with a posterior slip of the L5 vertebrae on the sacrum (S1) with a degenerative extruded disc in between. I have associated sciatic pain in my left leg caused by the extruded fragment pushing on the nerve.

I'm waiting on a consultation to discuss possible treatment, does anyone have any knowleadge or experiance of this type of problem and possible remedies?

I've done some research but is seems that in most cases the L5 slips forward rather than back so not sure is treatment would be the same.

Any advice or pointers on this I'd be grateful.



  • Slips in vertebre can either be called a spondylolysthesis ( forward slip) or a retrolisthesis (posterior or backward slip). Irregardless of the direction of the slip, the treatment is still usually the same, depending on the degree of the slippage. That is measured in degrees , 1st degree -25% or less, 2nd- degree-26-50% slip , 51%-75%- is 3rd degree , and finally 76%-100% is considered to be the most serious.
    It really depends on how far the slip is, whether it is impinging either the canal where the spinal cord passes or if the exiting nerve roots are compromised/impinged. If there is compression of either the canal or the nerve roots, the usual treatment is fusion to realign the spine and placement of short rods and screws to hold the vertebra in place.
    At the L5-S1 level, there is not as much movement circumfrentially as there is at the other lumbar levels because of the fact that L5 sits between your pelvic bones so there isn't the side to side rotation that there is at other levels.
    If I can be of any assistance, feel free to private message me or ask on the forums.
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