According to the Montana law a "debilitating medical condition" is needed to qualify and this includes "severe or chronic pain". So, looks like you would have a shot at it, depending on how the doctor determines your particular situation.

Montana Cares
Fencewalker Reviewed by Fencewalker on . getting legal prescription Hey, I was wondering if my case would be able to be prescribed a medical card in MT: Basically, I hurt my back in weightlifting (it would hurt bad enough to prevent me from running or certain lifting for days at a time) I did some research on cannabis and decided to grow my own (I was 16-17) Anyways, I harvested and used it for a while (I harvested a half of a pound) So now I'm in construction and my knees hurt daily (I mean like I'm sitting or standing, not doing much and then they start Rating: 5