Hi and welcome Geoff, sorry about your unfortunate accident but there are several alternatives. I obviously don't know the full extent of your disability but a few suggestions would be
1. Corded release which would allow use in either hand
2. Radio triggers (as a above but wireless) you can spend as little as a few pounds on ebay for cheap chinese triggers (these work fine i have a pair) to hundreds of pounds for original manufacturer specific units.
3. An app for ipad/iphone Or android smartphone, i use triggertrap which requires a dongle that is connected to the camera and then can be triggered by the phone. The big bonus with this method is that for very little outlay you not only have a remote trigger but a superb array of triggering systems including,
Intervalometer
Sound trigger
Vibration trigger
Motion trigger
Distance trigger
Long exposure hdr
Star trail
Bulb tamping
Wi Fi slave
And more.
All for about £25
Good luck with a solution.