Chiropractics; What's the deal?

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So is Chiropractics just Chiroquacktics? I would like to hope their is at least some application it has, because seeing all these Chiropractic offices around my town makes me kinda mad.

Subluxation theory is obviously horse shit, but is spinal manipulation beneficial for ailments such as lower back pain? Or should this whole field return to the 19th century?