The McKenzie Method® of Mechanical Diagnosis and Therapy® (MDT) is a whole-body system of assessing and treating musculoskeletal pain or injury that emphasizes patient empowerment and self-treatment without the use of expensive diagnostic imaging. This system of diagnosis and treatment is used for acute, subacute, and chronic conditions of the spine and extremities. McKenzie Method is science-based and well researched, and is designed to give patients control of their pain and empower them to be in control of their own symptom management, which can reduce dependency on medical intervention.

Most musculoskeletal pain is "mechanical" in origin, which means that a position, movement, or activity caused the pain to start. If a mechanical force caused the problem then it is logical that a mechanical force may be part of the solution. The MDT system is designed to identify the mechanical problem and develop a plan to correct or improve the mechanics and thus decrease or eliminate the pain and functional problems. The McKenzie assessment uses different positions and movements and the patient response to resolve the symptoms for which the patient is seeking care.