Re: suddenly intense sciatic pain after 3 weeks
There are a couple things that may be going on. When the surgeon is finishing up with the surgery, they dump in a bunch of antibiotics and steroids to minimize the chance of infection and to dull the early surgical pain. This takes about ten days to two weeks to wear off, and often patients will notice an increase in pain at this point.
Also around now, you are probably moving around a little bit more, maybe becoming a bit more active, which can lead to an increase in inflammation.
Are you limiting the amount of time you sit to 15-20 minutes at a time?
I wouldn't say it is common to have an increase in pain at this point, but it is not unusual, either!
I haven't had the Dynesys system so I can't speak from personal experience. With a "usual" fusion, it would be unusual for a screw to be a problem this early in your recovery unless you fell or did something that caused it to move.
If you had an incision on the back, there is a high probability that the surgeon had to move one or more nerves.
I would suggest you take it very easy for the next several days. If the sciatic pain is still intense, I would call your doctor. He may want you to come in just to be sure things are in order....