Great stuff, have to start looking at this better. I've been trying to set the DTL view with alignment stick as @boogielicious adviced somewhere I think, just now realised I always stand little away from alignment stick. 🙈
If I saw you in the office and xrays normal (no evidence of fx, AVN, or significant arthritic changes), I’d lean towards:
1. dorsal capsular sprain vs bony contusion from repetitive impact
2. synovitis of the joint
3. interosseous muscle strain
Obviously clinical exam is hugely helpful so take this with a grain of salt. honestly doesn’t matter what you call it, trxt still rest, NSAIDs, then MRI if no improvement in 2-3 weeks
This is why @iacas has provided guidance on filming your swing here:
I don't know if the information regarding cameras is still current, but the sections on camera set-up almost certainly are.