18 trials (1179 participants) were included in this updated review . The injection sites varied from epidural sites and facet joints (. intra-articular injections, peri-articular injections and nerve blocks) to local sites (. tender- and trigger points). The drugs that were studied consisted of corticosteroids, local anesthetics and a variety of other drugs. The methodological quality of the trials was limited with 10 out of 18 trials rated as having a high methodological quality. Statistical pooling was not possible due to clinical heterogeneity in the trials. Overall, the results indicated that there is no strong evidence for or against the use of any type of injection therapy .
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