This was an attempted correction for a L5-S1 Spondy. Basically the 5th lumbar vertebra slips anterior (forward) over the sacrum. This stretches the spinal cord, causing pain. The correction was attempted by using posterior fixation pedicle screws and rods to pull the 5th lumbar vertebra posterior (backwards) relative to the sacrum.

Based on this image, it’s hard to say - but very possible that this expensive procedure did not improve the pain the patient was experiencing. The spondy is still clearly present.

I love it! Do you have a blueprint to share? I’d love to give it a try.