Hello again....
I've now seen a physio 4 times. Not sure we've found root of problem - things aren't really any better yet. FWIW (if anyone's interested) she concluded:
1. Bad neck posture i.e. head and neck too far forward could be contributing. Told me to tuck chin in and pull neck back. Gave some exercises e.g. sitting back to wall, and moving back of head up wall.
2. Median nerve a bit constricted; gave nerve glide: palm flat on wall to the side at shoulder height and rotate backwards until fingers pointing down. (Can do that now).
3. Pain in wrist probably rough bones rubbing after a fracture at base of thumb. Applied some ultrasound, and recommended rubbing and manipulation to free up.
4. Root of problem likely the shortening of soft tissue on ulna side of hand and wrist; neck tension being caused by controlling this. Recommended stretching wrist in radial deviation.
So...
Q: Based on her hypothesis that basically the soft tissues on the ulna side are behaving like a piece of string going up the outside that's too short and pulling my elbow straight as I do radial deviation, what's the best way of stretching this? Specifically, what's the most intensive stretching I can safely do? E.g. hold it in radial deviation (active or passive?) for how long, how many reps at a time, and per day? But could I strap it up, and leave it in full radial deviation for a whole day at a time/over night? Note: range of movement isn't actually restricted neither is it painful in pure radial deviation, it's just pulls more against this movement.