You are reading an article about the McKenzie technique for…

You are reading an article about the McKenzie technique for low back pain, which is investigating the use of the McKenzie Extension Test on a consecutive sample of adults with low back pain. The article describes the purpose of the test is to determine if flexion or extension is a more appropriate intervention to resolve symptoms.  The manner in which the test was conducted is clearly written and there are photos demonstrating how to do the McKenzie Extension Test.  The article does not specifically describe how positive and negative results were defined.  This suggests the article has lower quality based on challenges with the description of: