Here's what I can tell you:
* Cresty neck is a condition, often associated with insulin resistance and Cushing's disease in horses, not a "fixable" issue in the same way as a broken bone.
* Managing the underlying condition is crucial to potentially reduce the severity of a cresty neck. This might involve diet changes, medication, and other veterinary interventions.
* Surgery is not a common treatment, and its efficacy is debated.
* The severity of the cresty neck, the underlying cause, and the overall health of the horse all play a role in treatment options and success.
I strongly advise consulting a veterinarian specializing in equine medicine for accurate diagnosis and personalized treatment recommendations. They can assess your miniature horse's specific situation and advise on the best course of action.