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Again? >> well, i think there's two aspects to this. one is that patients do want to live up to the expectations of the surgeon. so there is a placebo effect for surgery different than a placebo effect for a pill. i think the second part of this arth arthroscopy were performed on both groups. i think as this moves to the future it's important additional research occur and we can isolate what was the most important factor in this study. >> there's a whole host of doctors who think we overtest in this country, we overprescribe and overoperate. do you think this is a symptom of that sort of thing...

Aspects to this. one is that patients do want to live up to the expectations of the surgeon. so there is a placebo effect for surgery different than a placebo effect for a pill. i think the second part of this arthroscopy were performed on both groups. i think as this moves to the future it's important additional research occur and we can isolate what was the most important factor in this study. >> there's a whole host of doctors who think we overtest in this country, we overprescribe and overoperate. do you think this is a symptom of that sort of thing? are people demanding the scope because ...

Literally they say it was like a switch. >> for corrine there was no switch. >> that's healed great. >> seven weeks later, she still has sporadic headaches. >> so, i'm hopeful, but i don't want to, like, count my chickens. >> sure. when you have lived with pain for so long, you're, like, is it going to come, when is it going to happen? >> to be sure, migraine surgery has its detractors. common concerns among neurologists that the study suggesting this method works is flawed and the patients, well, they are most likely experiencing a placebo effect. the american headache society calls migraine ...

Fewer headaches. and he says for 60%, the pain goes away completely. >> we have patients that are almost three years out, and they're still reporting no headaches. so how are we doing? >> doing very good. >> no migraines. literally they say it was like a switch. >> for corrine there was no switch. >> that's healed great. >> seven weeks later, she still has sporadic headaches. >> so, i'm hopeful, but i don't want to, like, count my chickens. >> sure. when you have lived with pain for so long, you're, like, is it going to come, when is it going to happen? >> to be sure, migraine surgery has its ...

It's been around for decades, but with doctors moving away from the use of painkillers, newer, technically improved devices are in demand for patients suffering from chronic back pain. >> i think spinal cord stimulation is an excellent option especially for people who failed other therapies. >> reporter: because it is experimental, maria got hers for free. but many are concerned that $35,000 is a lot to pay for a surgery which, like any surgery, comes with risks. and some experts said there are serious questions about the effectiveness in the long term. some doctors believe the pain relief may...