Selective root nerve block injections help diagnose and treat nerve root pain

http://www.spine-health.com/treatment/injections/injections-back-pain-management

Selective Nerve Root Block (SNRB) for Diagnosis and Back Pain Management

Another common injection, a selective nerve root block (SNRB), is primarily used to diagnose the specific source of nerve root pain and, secondarily, for therapeutic relief of low back pain and/or leg pain (see Figure 1).

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