Cochrane collaboration review
The McKenzie method for (sub)acute non‐specific low back pain
"
Authors' conclusions

Based on low‐ to very low‐certainty evidence, the treatment effects for pain and disability found in our review were not clinically important. Thus, we can conclude that the McKenzie method is not an effective treatment for (sub)acute NSLBP.
"
https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD009711.pub2/full
#kinetoctoc