Carpal tunnel decompression surgery is generally very effective. Usually the horrible tingling that you get should go straight away after carpal tunnel decompression. Any continuous numbness will usually get better, but it can take six months. If the nerve has been very badly squashed, and the thumb muscle has started to waste away, then it sometimes doesn't completely bulk up, but it certainly shouldn't get worse after the procedure.
The chance of needing any further treatment after carpal tunnel decompression is under 3%. On rare occasions scar tissue can form in the tunnel, causing the condition to come back again in the future. If that happens the surgeon will usually re-visit the diagnosis, and discuss whether there is merit in further surgery.
More info:
https://rupertwharton.com/pages/carpal-tunnel
https://rupertwharton.com/blogs/news/what-causes-tingling-in-the-fingers
https://rupertwharton.com/blogs/news/what-is-affected-in-carpal-tunnel-syndrome
https://rupertwharton.com/blogs/news/what-are-the-treatment-options-for-carpal-tunnel-syndrome
https://rupertwharton.com/blogs/news/how-effective-is-carpal-tunnel-decompression-surgery
https://rupertwharton.com/blogs/news/carpal-tunnel-syndrome-is-there-anything-else-it-could-be
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Rupert Wharton, Hand surgeon in Central London (King Edward VII) and South West London (New Victoria and Kingston Private Health)