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It is typically the case that a patient in your dad's situation work with a pain management team to try to get control of his pain. Often, a multipronged approach utilizing the specialization of several different disciplines is able to minimize pain and maximize functionality. Surgery is usually the court of last resort as the risks can be high.
what disciplines are usually required
Internal medicine, anesthesiology, psychiatry, physical therapy, and pharmacy.
would any of these require being of good health generally or could he be helped regardless of any other problems. My mum (his wife) dad in December past and he is quite emotional at times.
Having a team of specialists and working with a physical therapist can be very helpful both physically and psychologically.