Do NOT go to a chiropractor for medical back treatment without a referral from an M.D. who is familiar with your case. The machine that decompresses spines is designed to decompress wallets and insurance companies until the quack who owns the machine gets caught.
While a legitimate chiropractor would never take a case such as the one described here, there still are chiropractors who believe they can cure serious spinal problems with manipulation.
What they do is cause disabling spinal cord injury and spinal strokes with their quackery.