I believe it really is the way to go, my trapezium bone was basically welded to all the other bones, so it was well and truly stuffed. I would suggest my other thumb is as bad if not worse, and the result while not a walk in the park is looking to be well worth the effort. I can grab my right thumb and get it to rotate very well whereas the left is pretty well very much limited in its movement. as far as voluntary movement it is probably already better than the left with no associated pain. This to me is a huge plus. The decision is ultimately up to you, but there are risks as one person here has found with resultant nerve damage.
The patient has basal joint arthritis of the thumb and randomized controlled trials have failed to demonstrate an advantage of steroid or hylan over saline.
Heyworth et al demonstrated that all three injections were similarly effective for approximately 3 months at reducing pain and increasing thumb function over baseline levels.
Stahl found that steroid and hylan were equally effective, but did not control with saline.
Henderson found no advantage of hyaluronan over saline for knee arthritis during a 5 week treatment course.