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] physical therapist Robin McKenzie, OBE (1931–2013)<ref>{{cite web|url=http://www.mckenziemdt.org/robin.cfm|title=Robin Anthony McKenzie|accessdate=15 May 2013|url-status=dead|archiveurl=https://web.archive.org/web/20130516033957/http://www.mckenziemdt.org/robin.cfm|archivedate=16 May 2013|df=dmy-all}}</ref> developed the method in the late 1950s.<ref>{{cite book |first1=Robin |last1=McKenzie |first2=Stephen |last2=May |title=Cervical and Thoracic Spine: Mechanical Diagnosis and Therapy |publisher=Orthopedic Physical Therapy Products |location= |year=2006 |pages= |isbn=978-0-9583647-7-5}}{{page needed|date=December 2010}}</ref><ref>{{cite book |first1=Robin A. |last1=McKenzie |first2=Stephen |last2=May |title=The lumbar spine mechanical diagnosis & therapy |publisher=Spinal Publications New Zealand |location=Waikanae |year=2003 |pages= |isbn=978-0-9583647-5-1 |url-access=registration |url=https://archive.org/details/lumbarspinemecha0000mcke }}{{page needed|date=December 2010}}</ref> In 1981 he launched the concept which he called ''Mechanical Diagnosis and Therapy (MDT)'' – a system encompassing assessment (evaluation), ] and ] for the ] and ]. MDT categorises patients' complaints not on an anatomical basis,<ref>{{cite journal |last1=Young |first1=S |last2=April |first2=C |last3=Laslett |first3=M |title=Correlation of clinical examination characteristics with three sources of chronic low back pain |journal=The Spine Journal |volume=3 |issue=6 |pages=460–5 |year=2003 |pmid=14609690 |doi=10.1016/S1529-9430(03)00151-7}}</ref><ref>{{cite journal |last1=Hancock |first1=M. J. |last2=Maher |first2=C. G. |last3=Latimer |first3=J. |last4=Spindler |first4=M. F. |last5=McAuley |first5=J. H. |last6=Laslett |first6=M. |last7=Bogduk |first7=N. |title=Systematic review of tests to identify the disc, SIJ or facet joint as the source of low back pain |journal=European Spine Journal |volume=16 |issue=10 |pages=1539–1550 |year=2007 |pmid=17566796 |pmc=2078309 |doi=10.1007/s00586-007-0391-1}}</ref><ref>{{cite journal |last1=Kolber |first1=Morey J. |last2=Hanney |first2=William J. |title=The dynamic disc model: a systematic review of the literature |journal=Physical Therapy Reviews |volume=14 |pages=181–19 |year=2009 |doi=10.1179/174328809X452827 |issue=3}}</ref> but subgroups them by the clinical presentation of patients.<ref>{{cite journal |last1=Werneke |first1=Mark W |last2=Hart |first2=Dennis L |title=Categorizing Patients With Occupational Low Back Pain by Use of the Quebec Task Force Classification System Versus Pain Pattern Classification Procedures: Discriminant and Predictive Validity |journal=Physical Therapy |date=1 March 2004 |volume=84 |issue=3 |pages=243–254 |doi=10.1093/ptj/84.3.243 |pmid=14984296 |doi-access=free }}</ref> ] physical therapist Robin McKenzie, OBE (1931–2013)<ref>{{cite web|url=http://www.mckenziemdt.org/robin.cfm|title=Robin Anthony McKenzie|accessdate=15 May 2013|url-status=dead|archiveurl=https://web.archive.org/web/20130516033957/http://www.mckenziemdt.org/robin.cfm|archivedate=16 May 2013|df=dmy-all}}</ref> developed the method in the late 1950s.<ref>{{cite book |first1=Robin |last1=McKenzie |first2=Stephen |last2=May |title=Cervical and Thoracic Spine: Mechanical Diagnosis and Therapy |publisher=Orthopedic Physical Therapy Products |location= |year=2006 |pages= |isbn=978-0-9583647-7-5}}{{page needed|date=December 2010}}</ref><ref>{{cite book |first1=Robin A. |last1=McKenzie |first2=Stephen |last2=May |title=The lumbar spine mechanical diagnosis & therapy |publisher=Spinal Publications New Zealand |location=Waikanae |year=2003 |pages= |isbn=978-0-9583647-5-1 |url-access=registration |url=https://archive.org/details/lumbarspinemecha0000mcke }}{{page needed|date=December 2010}}</ref> In 1981 he launched the concept which he called ''Mechanical Diagnosis and Therapy (MDT)'' – a system encompassing assessment (evaluation), ] and ] for the ] and ]. MDT categorises patients' complaints not on an anatomical basis,<ref>{{cite journal |last1=Young |first1=S |last2=April |first2=C |last3=Laslett |first3=M |title=Correlation of clinical examination characteristics with three sources of chronic low back pain |journal=The Spine Journal |volume=3 |issue=6 |pages=460–5 |year=2003 |pmid=14609690 |doi=10.1016/S1529-9430(03)00151-7}}</ref><ref>{{cite journal |last1=Hancock |first1=M. J. |last2=Maher |first2=C. G. |last3=Latimer |first3=J. |last4=Spindler |first4=M. F. |last5=McAuley |first5=J. H. |last6=Laslett |first6=M. |last7=Bogduk |first7=N. |title=Systematic review of tests to identify the disc, SIJ or facet joint as the source of low back pain |journal=European Spine Journal |volume=16 |issue=10 |pages=1539–1550 |year=2007 |pmid=17566796 |pmc=2078309 |doi=10.1007/s00586-007-0391-1}}</ref><ref>{{cite journal |last1=Kolber |first1=Morey J. |last2=Hanney |first2=William J. |title=The dynamic disc model: a systematic review of the literature |journal=Physical Therapy Reviews |volume=14 |pages=181–19 |year=2009 |doi=10.1179/174328809X452827 |issue=3}}</ref> but subgroups them by the clinical presentation of patients.<ref>{{cite journal |last1=Werneke |first1=Mark W |last2=Hart |first2=Dennis L |title=Categorizing Patients With Occupational Low Back Pain by Use of the Quebec Task Force Classification System Versus Pain Pattern Classification Procedures: Discriminant and Predictive Validity |journal=Physical Therapy |date=1 March 2004 |volume=84 |issue=3 |pages=243–254 |doi=10.1093/ptj/84.3.243 |pmid=14984296 |doi-access=free }}</ref>

Research has found that the McKenzie method has, at most, limited benefit for helping alleviate acute ]. It is of no benefit for ].


== Effectiveness == == Effectiveness ==

Revision as of 10:52, 25 April 2020

Medical intervention
McKenzie method
Robin Anthony McKenzie
Other namesMechanical Diagnosis and Therapy
[edit on Wikidata]

The McKenzie method (also MDT) is a comprehensive method of care primarily used in physical therapy.

New Zealand physical therapist Robin McKenzie, OBE (1931–2013) developed the method in the late 1950s. In 1981 he launched the concept which he called Mechanical Diagnosis and Therapy (MDT) – a system encompassing assessment (evaluation), diagnosis and treatment for the spine and extremities. MDT categorises patients' complaints not on an anatomical basis, but subgroups them by the clinical presentation of patients.

Effectiveness

A 2019 systematic review, which included high-reliability research, compared the effectiveness of treating chronic lower back pain using the McKenzie method versus manual therapy. The results showed that in the short-term (2-3 months) and long-term (after 6 and 12 months), the McKenzie method was more effective than manual therapy.

A study published in 2019 by the Journal of Manual & Manipulative Therapy compared the costs of treating lower back pain using the McKenzie Method (MDT) and traditional medical interventions that are used in such cases. The results showed that the cost of McKenzie therapy with a good result was 51% less.

The results of a meta-analysis conducted in 2018 indicate that the McKenzie method for chronic back pain was significantly more effective for increasing work capacity than just physical activity. In acute back pain, there was no difference between the McKenzie method and other interventions (presumably due to the presence of inflammation in the given period).

According to a meta-analysis of clinical trials in 2006, treatment using the McKenzie method is somewhat effective for acute low back pain, but the evidence suggests that it is not effective for chronic low-back pain. A 2012 systematic review agreed with this, finding that centralisation occurred more frequently in acute patients (74%) compared to subacute (50%) and chronic (40%). Also, centralisation was found to be more common in younger patients. Cervical centralisation was observed in only 37% of patients.

A 2006 systematic review into the clinical evidence of the McKenzie method's ability to treat spinal pain concluded that the McKenzie method decreased short-term (<3 months) to a higher degree than other standard treatments including: "nonsteroidal anti-inflammatory drugs, educational booklet, back massage with back care advice, strength training with therapist supervision, and spinal mobilization". At the intermediate term follow-up there was no statistical differences among therapies.

A report published in 2008 noted only marginal benefits over an assessment and advice-only group at the short-term follow up mark, 6 month, and 1 year.

A 2010 study concluded that the McKenzie method "does not produce appreciable additional short-term improvements in pain, disability, function or global perceived effect".

A 2006 systematic review of the literature assessed whether or not the McKenzie method treated Lower back pain more effectively than passive therapy, advice to stay active, flexion exercises, and others. The assessment concluded that there were no clinically significant benefits compared with the passive therapy and advice to stay active in those with acute lower back pain.

Terminology

The McKenzie method consists of two components used to treat musculoskeletal conditions: assessment and intervention. The assessment component of the McKenzie method uses repeated movements and/or sustained postures in a single direction to elicit centralisation. In spinal patients centralisation refers to a pattern of pain level response which is characterised by decreased or abolished pain symptoms, experienced sequentially, first to the left and right of the spine (distal symptoms), and ultimately abolished pain symptoms in the spine altogether.

The assessment portion attempts to discover “directional preference”, which identifies the pattern of lumbosacral movement in a single direction that effectively results in centralisation and subsequent abolishment of pain symptoms in the spine and the return of proper range of motion.

The intervention component of the McKenzie method is the corresponding repeated and/or sustained flexion and extension movements as prescribed by the assessment component.

History

‘‘Everything I know I learnt from my patients. I did not set out to develop a McKenzie method. It evolved spontaneously over time as a result of clinical observation’’ - Doctor Robin McKenzie.

The McKenzie method has its roots in a single event in 1956 that led to increased experimentation of certain movement in order to elicit what is now known as the centralisation phenomenon. A patient who was experiencing pain on the right side of his lower back buttock, laid down on doctor McKenzie's treatment table. The patient ended up lying in significant lumbar extension for around five minutes, meaning his back was bending backward because the head of the table had been raised for a previous patient. After ceasing this sustained position in lumbar extension the patient noted the pain on the right side of his body had experienced surprising and significant improvement.

This led McKenzie to continuously experiment with specific movement and movement patterns to treat chronic lower back pain and bring about centralisation of pain symptoms. Over the years of experimentation in Robin McKenzie’s career, he noted patterns of symptom relief in response to prescribed spinal movements and positions and developed a classification system to categorise spinal pain problems. McKenzie went on to write and publish books so people could manage and treat their own back pain, such as “Treat Your Own Back” first published in 1980, with the latest edition being published in 2011.

Description

The McKenzie Method also referred to as Mechanical Diagnosis and Therapy is a method of assessing and treating spinal back pain and related extremity pain most commonly through the use of specific repeated movements and appropriate prevention measures. The method puts an emphasis on self-care after initial clinical visits. There are four major steps when it comes to proper McKenzie method therapy: assessment, classification, treatment, and prevention.

The assessment or evaluation procedure determines the type of movements that result in centralisation and reduction in pain.

MDT uses primarily self-treatment strategies, and minimises manual therapy procedures, with the McKenzie-trained therapist supporting the patient with passive procedures only if an individual self-treatment program is not fully effective.

McKenzie states that self treatment is the best way to achieve a lasting improvement of back pain and neck pain.

Centralisation

Centralisation occurs when Pain symptoms off-centered from the mid-line of the spine, often diagnosed as sciatica, migrate towards the centre of the mid-line of the spine. This migration of pain symptoms to the centre of the lower back is a sign of progress in the McKenzie method. A patient has found their directional preference once they discover which repeated end-range exercise movements elicit centralisation of pain symptoms. The most common directional preference that result in centralisation is extension of the back. In many cases extension exercises are commonly referred to as McKenzie exercises for this very reason.

According to the McKenzie method, movements and exercises that produce centralisation are very beneficial whereas movements that create pain that wander from the spinal mid-line are extremely detrimental to a patient's specific condition. A 2012 systematic review found that lumbar centralisation was associated with a better recovery prognosis in terms of pain, short- and long-term disability, and the likelihood of undergoing surgery in the following year.

Assessment

The first step is understanding a patient's symptoms and how they behave—such as where the patient feels pain and when, how often in a day, to what degree, and in what specific movements or positions does pain intensify or express itself. The patient will be tested and asked by a clinician to perform specific single direction movement, both sustained and repeated. A large differentiator from other physical therapy methods of assessment is the use of repeated movements. A range of single direction movements are used in this phase of the McKenzie method, depending on how pain symptoms behave and change will allow the clinician to categorise the problem to effectively prescribe the proper movements to achieve centralisation and elimination of spinal and sciatic pain.

Classification

There are three primary classifications that result from the assessment portion of the McKenzie method's comprehensive approach; Postural syndrome, dysfunction syndrome, and derangements syndrome with a minority of patients falling into an 'other category. Each classification represents the likely underlying reason of experienced pain symptoms and symptom behaviour. The classification process is very important because it determines if the McKenzie method is an appropriate approach for specific patients and also determines which movement and protocols will most likely lead to centralisation and a cessation or reduction of pain symptoms. Each syndrome corresponds to specific mechanical procedures.

Treatment

Depending on the classification and the nature of the underlying cause of disablement, certain treatment protocols are used. Depending on classification type and directional preference, patients perform specific exercises to end-range. There will be limited mobility and the position will likely cause discomfort, but the patient repeats the exercises one after the other until centralisation occurs, pain symptoms subside, and mobility to end-range increases.

Derangement Syndrome

New evidence suggests that centralization and peripheralization of pain can only occur in the derangement syndrome. It is the most commonly encountered classification. Defined by pain that is experienced due to a disturbance in the joint area resulting in diminished movement in certain directions. Depending on a patient's specific directional preference as discovered in the assessment stage of the McKenzie method, patients are prescribed to use repeated movements in a single direction that cause a gradual reduction in pain and centralisation of pain symptoms. That is, symptoms of pain from the left and right of the middle-lower back become centralised to the centre of the lower back and over time result in lasting reduction of pain symptom intensity.

Dysfunction Syndrome

This type of pain is categorised by mechanical impairments and deformities of impaired tissue within the body such as scar tissue or shortened tissues. To treat this treatment classification the goal is to remodel the impaired tissue by mobilisation exercise

Postural Syndrome

This type of pain is the result of postural deformation. Static holds of improper end-range positions, such as slouching are the cause of postural syndrome. Treatment is more geared towards education and proper posture training rather than repeated exercises as the other syndrome classifications prescribe.

Technique

McKenzie exercises is synonymous with spinal extension exercises, as opposed to William Flexion Exercises which is synonymous to lumbar flexion exercises. Physical Therapist usually prescribe McKenzie exercises for patients with centralization phenomenon with directional preference towards spinal extension.

Spinal extension exercises include, but are not limited to:

  1. Prone position lying flat (patient lies flat on their stomach)
  2. Prone position propped on elbows (patient lies flat on their stomach and props themselves onto their elbows with the spine in extension)
  3. Prone position propped on hands (patient lies flat on their stomach and props themselves onto their hands with elbows in full extension, with the spine in extension)
  4. Standing lumbar extension (patient stands upright with feet shoulder-width apart, and puts hands on the lower back while extending the spine)

Spinal flexion, rotation, or lateral bending can also perform such exercises.

Prevention

The last portion of treatment is designed to educate patients to ensure proper continuation of appropriate exercises and correct structural positioning day-to-day. Self-care and proper exercise is stressed and encouraged as prevention methods.

Prevalence of use

The McKenzie method was commonly used worldwide in the late 2000s in diagnosis and treatment of low back pain, and peripheral joint complaints.

See also

References

  1. "Robin Anthony McKenzie". Archived from the original on 16 May 2013. Retrieved 15 May 2013.
  2. McKenzie, Robin; May, Stephen (2006). Cervical and Thoracic Spine: Mechanical Diagnosis and Therapy. Orthopedic Physical Therapy Products. ISBN 978-0-9583647-7-5.
  3. McKenzie, Robin A.; May, Stephen (2003). The lumbar spine mechanical diagnosis & therapy. Waikanae: Spinal Publications New Zealand. ISBN 978-0-9583647-5-1.
  4. Young, S; April, C; Laslett, M (2003). "Correlation of clinical examination characteristics with three sources of chronic low back pain". The Spine Journal. 3 (6): 460–5. doi:10.1016/S1529-9430(03)00151-7. PMID 14609690.
  5. Hancock, M. J.; Maher, C. G.; Latimer, J.; Spindler, M. F.; McAuley, J. H.; Laslett, M.; Bogduk, N. (2007). "Systematic review of tests to identify the disc, SIJ or facet joint as the source of low back pain". European Spine Journal. 16 (10): 1539–1550. doi:10.1007/s00586-007-0391-1. PMC 2078309. PMID 17566796.
  6. Kolber, Morey J.; Hanney, William J. (2009). "The dynamic disc model: a systematic review of the literature". Physical Therapy Reviews. 14 (3): 181–19. doi:10.1179/174328809X452827.
  7. Werneke, Mark W; Hart, Dennis L (1 March 2004). "Categorizing Patients With Occupational Low Back Pain by Use of the Quebec Task Force Classification System Versus Pain Pattern Classification Procedures: Discriminant and Predictive Validity". Physical Therapy. 84 (3): 243–254. doi:10.1093/ptj/84.3.243. PMID 14984296.
  8. Namnaqani, Fayez Ibrahim; Mashabi, Abdulrhman Salah; Yaseen, Khalid Mohammed; Alshehri, Mansour Abdullah (2019). "The effectiveness of McKenzie method compared to manual therapy for treating chronic low back pain: a systematic review". Journal of Musculoskeletal & Neuronal Interactions. 19 (4): 492–499. PMC 6944795. PMID 31789300.
  9. https://www.tandfonline.com/doi/full/10.1080/10669817.2019.1613008
  10. Lam, Olivier T.; Strenger, David M.; Chan-Fee, Matthew; Pham, Paul Thuong; Preuss, Richard A.; Robbins, Shawn M. (June 2018). "Effectiveness of the McKenzie Method of Mechanical Diagnosis and Therapy for Treating Low Back Pain: Literature Review With Meta-analysis". Journal of Orthopaedic & Sports Physical Therapy. 48 (6): 476–490. doi:10.2519/jospt.2018.7562. PMID 29602304.
  11. ^ Machado, Luciana Andrade Carneiro; de Souza, Marcelo von Sperling; Ferreira, Paulo Henrique; Ferreira, Manuela Loureiro (April 2006). "The McKenzie Method for Low Back Pain". Spine. 31 (9): E254 – E262. doi:10.1097/01.brs.0000214884.18502.93. PMID 16641766.
  12. ^ May, Stephen; Aina, Alessandro (December 2012). "Centralization and directional preference: A systematic review" (PDF). Manual Therapy. 17 (6): 497–506. doi:10.1016/j.math.2012.05.003. PMID 22695365.
  13. ^ Busanich, Brian M; Verscheure, Susan D (2006). "Does McKenzie Therapy Improve Outcomes for Back Pain?". Journal of Athletic Training. 41 (1): 117–119. PMC 1421491. PMID 16619104.
  14. Paatelma, M; Kilpikoski, S; Simonen, R; Heinonen, A; Alen, M; Videman, T (2008). "Orthopaedic manual therapy, McKenzie method or advice only for low back pain in working adults: A randomized controlled trial with one year follow-up". Journal of Rehabilitation Medicine. 40 (10): 858–863. doi:10.2340/16501977-0262. PMID 19242624.
  15. Machado, Luciana AC; Maher, Chris G; Herbert, Rob D; Clare, Helen; McAuley, James H (26 January 2010). "The effectiveness of the McKenzie method in addition to first-line care for acute low back pain: a randomized controlled trial". BMC Medicine. 8 (1): 10. doi:10.1186/1741-7015-8-10. PMC 2842230. PMID 20102596.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  16. ^ May, Stephen; Donelson, Ronald (January 2008). "Evidence-informed management of chronic low back pain with the McKenzie method". The Spine Journal. 8 (1): 134–141. doi:10.1016/j.spinee.2007.10.017. PMID 18164461.
  17. Kilpikoski, Sinikka; Airaksinen, Olavi; Kankaanpää, Markku; Leminen, Päivi; Videman, Tapio; Alen, Markku (April 2002). "Interexaminer Reliability of Low Back Pain Assessment Using the McKenzie Method". Spine. 27 (8): E207 – E214. doi:10.1097/00007632-200204150-00016. PMID 11935120.
  18. Clare, Helen A.; Adams, Roger; Maher, Christopher G. (February 2005). "Reliability of McKenzie Classification of Patients With Cervical or Lumbar Pain". Journal of Manipulative and Physiological Therapeutics. 28 (2): 122–127. doi:10.1016/j.jmpt.2005.01.003. PMID 15800512.
  19. ^ McKenzie, Robin (2011). Treat Your Own Back. Spinal Publications New Zealand Ltd. pp. x–xi. ISBN 978-0-9876504-0-5.
  20. McKenzie RA. The lumbar spine: mechanical diagnosis and therapy. Waikanae, NZ: Spinal Publications New Zealand Ltd., 1981.
  21. "For Patients - The McKenzie Institute, USA". www.mckenzieinstituteusa.org. Retrieved 2 April 2017.
  22. Udermann, Brian E; Spratt, Kevin F; Donelson, Ronald G; Mayer, John; Graves, James E; Tillotson, John (1 July 2004). "Can a patient educational book change behavior and reduce pain in chronic low back pain patients?". The Spine Journal. 4 (4): 425–435. doi:10.1016/j.spinee.2004.01.016. PMID 15246305.
  23. May, Stephen; Gardiner, Eric; Young, Steve; Klaber-Moffett, Jennifer (18 July 2013). "Predictor Variables for a Positive Long-Term Functional Outcome in Patients with Acute and Chronic Neck and Back Pain Treated with a McKenzie Approach: A Secondary Analysis". Journal of Manual & Manipulative Therapy. 16 (3): 155–160. doi:10.1179/jmt.2008.16.3.155. PMC 2582422. PMID 19119405.
  24. "What does it involve?". The McKenzie Institute International®. Retrieved 2 April 2017.
  25. "The McKenzie Method". The McKenzie Institute International®. Retrieved 2 April 2017.
  26. ^ "Mckenzie Method - Physiopedia, universal access to physiotherapy knowledge". www.physio-pedia.com. Retrieved 3 April 2017.
  27. ^ Mann, Steven J.; Singh, Paramvir (2020). McKenzie Back Exercises. StatPearls Publishing. PMID 30969542.
  28. "The McKenzie Method". The McKenzie Institute International®. Retrieved 2 April 2017.
  29. Horton, S; Franz, A (2007). "Mechanical Diagnosis and Therapy approach to assessment and treatment of derangement of the sacro-iliac joint". Manual Therapy. 12 (2): 126–32. doi:10.1016/j.math.2006.06.001. PMID 16891145.
  30. Spoto, Marcia Miller; Collins, Jennifer (2008). "Physiotherapy diagnosis in clinical practice: a survey of orthopaedic certified specialists in the USA". Physiotherapy Research International. 13 (1): 31–41. doi:10.1002/pri.390. PMID 18189334.
  31. Miller, Eric R.; Schenk, Ronald J.; Karnes, James L.; Rousselle, John G. (2005). "A Comparison of the McKenzie Approach to a Specific Spine Stabilization Program for Chronic Low Back Pain". Journal of Manual & Manipulative Therapy. 13 (2): 103–12. doi:10.1179/106698105790824996.
  32. Tulder, Maurits; Becker, Annette; Bekkering, Trudy; Breen, Alan; Gil Del Real, Maria Teresa; Hutchinson, Allen; Koes, Bart; Laerum, Even; et al. (2006). "Chapter 3 European guidelines for the management of acute nonspecific low back pain in primary care". European Spine Journal. 15: S169–91. doi:10.1007/s00586-006-1071-2. PMC 3454540. PMID 16550447.{{cite journal}}: CS1 maint: numeric names: authors list (link)
  33. Schrupp, Robert J. (June 2004). "Honoring Our 'Giants'". Advance for Physical Therapy & Rehab Medicine. 15 (14): 61. Archived from the original on 7 July 2011. Retrieved 7 December 2010.
  34. May, Stephen; Ross, Jenny (2009). "The McKenzie Classification System in the Extremities: A Reliability Study Using Mckenzie Assessment Forms and Experienced Clinicians". Journal of Manipulative and Physiological Therapeutics. 32 (7): 556–63. doi:10.1016/j.jmpt.2009.08.007. PMID 19748407.
  35. McKenzie, Robin (2000). Human Extremities: Mechanical Diagnosis and Therapy. Orthopedic Physical Therapy Products. ISBN 978-0-9583647-0-6.

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