5 weeks in a cast for non displaced distal radius fracture.can rotate my thumb but not bend it. also experiencing a numb, pins and needles sensation ?

See your doctor.: You should see your doctor/orthopedist today. You should not be having the numbness and pins and needles. The cast may need to be replaced. Your orthopedist can make the proper decision of what to do once you are examined.

Tendons to the thumb: cross over the radius and can be irritated and painful when there is a distal radius fracture. the thumb tendon that raises the thumb can be prone to rupture also. the thumb muscle that flexes the tip originates on the radius and surgery can disturb it transiently. Speak to your surgeon

Swelling: swelling and stiffness can limit your movement but you should also be checked out by your hand surgeon to make sure you didnt rupture your tendon. Numbness can be caused by swelling near the nerve . If it doesn't go away after the cast is off and you get your movement back then you should be tested for carpal tunnel syndrome which commonly occurs after a distal radius fracture