Hi, thanks for writing to HCM.
It is not uncommon to have post operative pain in the shoulder region after a humeral interlocking nailing as the proximal tip of the nail causes impingement of the soft tissue
structures (mainly the rotator cuff
muscles). If the nail is positioned proud over the humeral head, it leads to more problems.
As you doctor rightly said, the nail must not be removed untill the bone unites, which may take around 4-6 months time to have a solid union.
So, there is no way for you but to endure the pain. Temporary analgesic
medications, Ice packing over the painful area and local massaging with pain creams will be of some help.
Hope this information is helpful. Good day