McKenzie Method Basics
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Direct answer
Pain that retreats from the calf to the thigh and settles back into the low back is centralising — the most useful sign in the McKenzie system, because it marks a rapidly reversible problem with a good prognosis. Robin McKenzie's Mechanical Diagnosis and Therapy classifies mechanical spinal pain by its response to repeated test movements: derangement (the commonest, in which one specific direction abolishes or worsens pain), dysfunction (intermittent end-range pain from shortened tissue) and postural (pain only from sustained postures). Treatment repeats the direction that centralises pain — most often extension in the lumbar spine — and hands the method to the patient for self-management.
What you must remember
- Robin McKenzie, a New Zealand physiotherapist, discovered the extension principle in the 1950s when a patient left lying prone in extension recovered dramatically; the system is now taught worldwide as MDT.
- The three syndromes: derangement — rapidly changing pain with movement, a directional preference, and often obstructed extension; dysfunction — consistent pain reproduced only at end range from adaptive shortening (for example, an extension dysfunction after a healed disc injury); postural — pain from sustained loading, relieved by movement, with no range loss.
- Centralisation means pain moves proximally, toward the midline; peripheralisation — distal spread or increase — is the signal to abandon that direction immediately.
- Assessment uses repeated movements, sagittal first (flexion and extension in standing, then lying), and a pain diagram tracked across sessions; lateral shifts need lateral forces or side-gliding.
- Classical derangement programme: prone lying, then prone on elbows, then prone press-ups, ten repetitions several times daily; the cervical counterpart uses retraction then extension.
- Rules that travel with the method: avoid flexion in the first hour after waking (overnight disc hydration makes flexion most dangerous then), sit with a lumbar support, and self-treat recurrences before returning to the clinician.
- Centralisation is a validated prognostic marker; patients whose pain centralises recover faster and more completely — and no red flag should be managed mechanically at all.
Where students slip
Centralisation is judged by pain location, not intensity — pain may briefly worsen while centralising, and intensity-only readers misclassify. Derangement versus dysfunction turns on rapid change: derangement pain shifts within one session, dysfunction pain only reproduces at a consistent end range. The notion that McKenzie equals extension for everyone is the trap; the direction comes from assessment, and a minority of patients are flexion-responsive. The morning flexion rule and the postural syndrome's "no exercise needed" conclusion both appear as single-line MCQs.
Frequently asked questions
What is centralisation, and what does it predict?
Pain moving from a distal to a proximal or central location; it predicts a favourable outcome and validates the treatment direction.
Name the three McKenzie syndromes.
Derangement, dysfunction and postural syndromes — with an "other" category for non-mechanical presentations.
Which is the commonest McKenzie syndrome in the lumbar spine?
Derangement, the group that responds to repeated movement in a directional preference.
What home exercise is classic for an extension-responsive lumbar derangement?
Prone press-ups, ten repetitions several times daily, progressed through prone-on-elbows positioning.
What does peripheralisation during testing demand?
Abandoning that movement direction and testing the opposite direction; peripheralisation is a stop signal.