Hello,
It is very normal to be stiff after being treated in a cast. This can take anywhere from a few weeks to a couple months to resolve.
However, with non-operatively treated wrist
fractures, there is a risk of rupturing the thumb extensor tendon, meaning that you would loose the ability to straighten out your thumb.
This risk is low, but it does happen, but if you are able to straighten out your thumb then there is nothing to worry about.
The loss of turning your wrist upwards, also known as supination is normal, but you might not ever get it all back, it just depends on how bad your break was, and your natural individual body response.
Hope I have answered your query. Let me know if I can assist you further.
Take care
Regards,
Dr Daniel Richard Paull, Orthopaedic Surgeon