I tried this before surgery and it did not help in so far as it did not buy me time a a desk. Yes it was hard on my knees too. I still have this chair and should try again.
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Nov 07: STALIF Fusion L5/S1 ACTIV-L ADR L4/L5
Nov 09: Prodisc-C ADR 2 level C 4/5/6
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