Fusing L5/S1 is "less bad" if you don't have any sacroiliac joint issues. The sacroiliac joint doesn't move much, but is sensitive to overstress just like the spinal motion segments or any other joint. If you've tested positive for SI joint pain on a diagnostic injection, I would go avoid fusing L5/S1 if you have other viable options.
Best,
Laura
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Laura - L5S1 Charitee
C5/6 and 6/7 Prodisc C
Facet problems L4-S1
General joint hypermobility
Jim - C4/5, C5/6, L4/5 disk bulges and facet damage, L4/5 disk tears, currently using regenerative medicine to address
"There are many Annapurnas in the lives of men" Maurice Herzog
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