A meta-analysis of clinical trials of spinal manipulation.

SMT proved to be consistently more effective in the treatment of low back pain than were any of the array of comparison treatments. The analysis provided some suggestion that manipulation, as such, is more effective than mobilization, as such. For the future, it is suggested that researchers strive for more consistent measures in terms of explicit descriptions of the nature of SMT, the times of post-treatment assessments and the nature of outcome measures. Only then can meta-analysis fulfill its potential in this clinical area.