Fracture of the scaphoid bone at the base of the thumb usually requires casting for six to eight weeks. Patients are advised to avoid twisting motions or any activity that could result in a fall onto the outstretched hand.
It may be possible to get what's called a functional cast. The elbow and thumb are left free to move. The wrist is put in a position of slight extension (cocked back a little). This position allows most people to perform daily activities.
Your doctor may advise against the gripping and pulling required by your job during the early days of healing. It would be a good idea to let the doctor know your work needs. Ask about a functional cast and any limits on motion or activities based on your injury.