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Jack it up and get underneath.
With the wheels off the ground, check for play in the ball joints. If one was reaching end of life the hit could have weakened it.
See if your steering rack is still solidly attached to the firewall, and that the control arms are solidly connected to the rack AND to the steering knuckles. The bushings are probably old and worn, and a hard hit could damage one or more of them.
Pull the wheels and look at the inside edges. I've pranged a couple wheels on potholes, bending the inner edge. They can look fine on the outboard side and hold air, but they are gonna cause shaking and vibration.
See if your sway bars are still securely mounted and the end that goes to the lower control arms are still ok.
See if you have any play in the rearward facing bushes on the control arms Those die slowly but if they are at end of life (about 40-50K miles) a hard hit could take it out.
I doubt it's a CV joint as the usually make other noises.
It is possible, if you hit a pothole really hard, that you actually moved the strut tower. Unlikely, but worth a look.
Keep us posted, and good luck.
1999 9-3 SE auto (daily driver)
1996 9000 CSE 5 speed (soon to leave)
2003 9-5 Linear SportWagon (wife's)
1984 C900 4 door Base model (RIP)
1995 9000 CS (sold)
1996 9000 CS (RIP)
2000 9-3 SE (RIP)
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