Sometimes there is no obvious reason. The location of the fracture and the angle of the broken ends is also an important factor in healing. Generally, a fractured clavicle is allowed to heal without other intervention. Whether the doctor decides to treat a non-union depends on the patient's difficulty using the affected arm and shoulder, whether it remains painful and the amount of deformity at the fracture site. Several options are available for treatment including, electrical bone growth stimulators, mechanical stabilization using metal rods and plates and chemical modulators using the patient's own bone from another site.
Every case is different.
Discuss your options with your physician and ask at what point he or she will intervene. Meanwhile, it won't hurt to make sure you are taking adequate calcium. Leg cramps I have terrible leg cramps at night. It even hurts to touch them. Also, my arms go to sleep at night.