hello there , welcome to healthcaremagic, what your doctor advised was correct 6 weeks of immobilisation of wrist is enough for upper limb fractures. but as you were not using your wrist for last 6 weeks there will be stiffness in wrist naturally if it s immobilsed. what you need to do is start mousing your wrist. you ve to start moving your wrist up and down, circular movements even if it s painful, it will be a bit painful initially but you have to continue moving your wrist to relieve stiffness and to avoid further stiffness of wrist. but avoid over stressing your wrist. pain silver relieved eventually. I hope it solves your query. thank you.