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Muscle Energy Technique
Matthew Cannella MS, ATC, SCAT
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Disclaimer
• I am not endorsed, nor do I receive any monetary, financial, or additional benefits from this presentation. I have no affiliations, sponsorships, nor partnerships with the authors of these books, or the institutions that the authors represent or are affiliated with. The sole purpose of this lecture is for information purposes only. It is designed to educate and introduce an overview of this technique and is not a model for how Health Care Providers should perform said techniques.
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Objectives
• Review relevant Anatomy
• Review Normal and Dysfunctional Vertebral Motion
• Identify the two kinds of Dysfunctions associated with Muscle Energy Technique for the Lumbar Spine
• Introduce how Muscle Energy Technique can be used to diagnosis and treat dysfunctions/ lesions of the Lumbar Spine
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Expectations
• Time
• Understanding MET
• Greenman vs. Chaitow
• Why I use MET
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What is Muscle Energy Technique?
• “Muscle energy technique is a manual medicine treatment procedure that involves the voluntary contraction of patient muscle in a precisely controlled direction at varying levels of intensity against a distinctly executed counterforce applied by the operator.”
1
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History of MET
• Fred Mitchell Sr. 1948 article • “The Balanced Pelvis and its Relationship to Reflexes.”
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What can MET be used for?
• Lengthen a shortened, contracted, or spastic muscle
• Strengthen a physiologically weakened muscle or group of muscles
• Reduce localized edema and relieve passive congestion
• Mobilize an articulation with restricted mobility
1
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MET vs. PNF
• Similarities• Both involve isometric contractions
• Objective of both is to normalize a broad range of Orthopedic Conditions or Somatic Dysfunction
• Typically MET has been used to restore normal joint function
• In recent years the Scope of MET has increased to the use of Soft Tissue Dysfunctions, which has blurred the lines between the two.
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MET vs. PNF
Muscle Energy • Restriction barrier is the first
perceived sign of tension, resistance
• 20% or less strength is described by Greenman
PNF• Restriction barrier involves moving
to end range, where the patient perceives discomfort
• Longer and stronger isometric contraction
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Somatic Dysfunction
• Greenman• “Impaired or altered function of related components of the somatic (body framework)
system; skeletal, arthrodial, and myofascial structures; and related vascular, lymphatic, and neural elements.” 1
• International Classification of Disease (ICD-11)• ME93.0 Segmental and Somatic Dysfunction.
• Facet Dysfunction
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Normal Vertebral Motion
• The Vertebral Motion Segment Consists of:• Articulating Vertebra above and below (i.e. L3, L4)
• The intervertebral Disc
• Ligamentous Structures
1
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Axis and Translation
• Motion described as:• Rotation around an axis
• Translation along an axis
• Moving within one of the Cardinal Planes
1
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Right Hand Orthogonal Coordinate System
Axis and Translation• Horizontal Axis – X axis
• Vertical Axis – Y axis
• Anteroposterior Axis – Z Axis
Taken from Greenman’s Principles of Manual Medicine 4rd Edition1
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Axis and Translation
• Coronal Plane- XY plane
• Sagittal Plane- YZ plane
• Horizontal Plane - XZ Plane
Taken from Greenman’s Principles of Manual Medicine 4rd Edition 1
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Forward Bending
• The superior vertebra will rotate anteriorly along x-axis, translate forward on z axis
• Anterior Longitudinal Ligament becomes lax
• Anterior pressure is placed on the disc displacing nucleus posterior
• Posterior Longitudinal Ligament, Ligamentum Flavum and Interspinous and Supraspinaus ligaments take on more tension
• The Transverse process of superior segement will move anteriorly
• This is termed as opening or flexing of the facet joint1
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Backward Bending
• The superior vertebra will rotate backward around x- axis and move posteriorly along z- axis
• Anterior Longitudinal Ligament becomes tense • Posterior Longitudinal Ligament, Ligamentum Flavum and Interspinous and
Supraspinaus ligaments become less tense• The Transverse process of superior segment will move posteriorly• This is termed as closing or extending of the facet joint
1
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Side Bending Left/ Right
• Rotation around the z-axis
• Translation along the x-axis
• Rotation around the y axis
• Side bend right closes facet on right and opens on left
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Rotation Left/Right
• Rotation around the y axis
• Translation dependent on the segment involved
• Rotation is always a component of side bending with exception of Atlantoaxial joint
1
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Theories of Dysfunction
1. There is an entrapment of synovial material or synovial meniscoid between two articulating surfaces
2. There is a lack of contact between joint surfaces that allows for mal tracking.
3. There is a change in the physical and chemical properties of the synovial fluid and surfaces.
4. Motion is restricted due to an alteration of muscle length and tone.
5. Changes in the biomechanical and biochemical properties of the myofascial elements of musculoskeletal system, ligaments, capsule ad fascia.
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Theories of Dysfunction
• Greenman notes, “ Regardless of the theory to which one might subscribe; the clinical phenomenon of restricted vertebral motion can be viewed as the influence on the paired zygapophysial joints of the segment. 1
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Theories of Dysfunction
• The ability of the facets to open and close
• Accordion vs Separation type movements
• Trunk Flexion – Facets Open
• Trunk Extension – Facets Close
• Interference will result in restrictions
1
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Fryette’s Laws of Spinal Motion
• Law 1• If the AP curve of the spine is in a neutral (midrange) position, side bending and rotation
occur to opposite sides (Neutral Spine Mechanics)
• Law 2• If the spinal segment is in a non-neutral (flexed or extended) position, side bending and
rotation occur to the same side
• Law 3• Movement in one cardinal plane reduces available motion in the other two cardinal planes
1
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Type 1 Restrictions
• Neutral or Group Dysfunctions
• 3 or more consecutive segments
• Side bending and rotation to opposite sides
• No position where transverse processes are symmetrical • Minimal change in flexion or extension
• Found in Neutral
1
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Type 2 Restrictions
• Non-Neutral Group Dysfunction
• Single Vertebral Motion Segment involved
• Side bending and rotation to the same side
• Found in either flexion or extension
• If found in Neutral, plus a direction classified as a Major Restriction (Important with Tx Order)
1
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Diagnosis of Dysfunction
• There are 2 methods outlined by Greenman• First Method:
• Palpating 2 boney prominences (SP,s or TP’s) of 2 or more Vertebrae• Active or Passively going through ROM (Flx/Ext, Rot, SB)• As outlined in the text sounds like PPIVMs
• 2 problems with this method:• Each time multiple ROM is assessed diagnostically, there is a therapeutic effect• The difficulty in making an assessment after a treatment procedure
1
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PPIVMs
• Passive Physiological Intervertebral Movement
• As per Maitland:
• Examines the intervertebral mobility of articulating segments of the spine • Could assess a stability issue in that segment
• Could serve as a reassessment procedure after a manipulation
• Can be adapted for treatment purposes.
3
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Diagnosis of Dysfunction
• The Second Method is the preferred method of Greenman• Follow a pair of TP’s through Flexion/Extension
• Interpret findings of Facet opening vs. Facet closing
• This allows Dysfunction to be described as either:• Position of the restricted segment
• The motion that is lost in the restricted segment
1
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Diagnosis of Dysfunction
• Type 1 Dysfunction – Neutral Group• 3 or more consecutive segments
• The rotated side will be opposite of the side bend
• N SR RL = Neutral Group, Side Bend Right, Rotation Left
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Diagnosis of Dysfunction
• ERS• Extension
• Rotation
• Side Bend
• Stuck Closed
• Found in Flexion
• FRS• Flexion
• Rotation
• Side Bend
• Stuck Open
• Found in Extension
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Diagnosis of Dysfunction
• How do I know which side a segment is rotated to?
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Prone Exam • While in neutral palpate lumbar transverse processes
• Determine if transverse processes are symmetrical
• Note the side that is either deeper or shallow
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Flexion• While in flexion palpate lumbar transverse processes
• Determine if transverse processes are symmetrical
• Note the side that is either deeper or shallow
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Extension• While in extension palpate lumbar transverse processes
• Determine if transverse processes are symmetrical
• Note the side that is either deeper or shallow
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Seated• While seated palpate lumbar transverse processes
• Patient will move into flexion/ extension while seated• Determine if transverse processes are symmetrical
• Note the side that is either deeper or shallow • This is a more challenging way to appreciate, “Lesions”
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FlexionExtension
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Treatment Order
• Non Neutral Group dysfunctions first
• Group Dysfunctions last
• Start with lower segments closet to sacrum first • Unless a major restriction is present1
• Lumbar spine before pelvis
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Treatment
• 2 correction positions – Seated and Side Lying
• Patient is placed in opposite direction of the Dx
• Patient is resisted into the Dx Position
• Side lying Patient is:• Side of the rotation is toward the table
• Contractions are repeated 3x @ 6 seconds each
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Clinician Positioning
• ERS Left – Left Side, behind the patient
• ERS Right – Right Side, behind the patient
• FRS Left – Right Side, behind the patient
• FRS Right – Left Side, behind the patient
• N SL RR - Left side of the patient
• N SR RL - Right side of the patient
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ERS left L5
• Prone Exam: L5 TP Deep on Right
• Flx/Ext Exam: Found in Neutral and Flx
• Side lying correction
• Found in Flx
• Side of Rotation toward table
• Resisting Hip ADD
• Post Tx Resist Trunk Ext*
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FRS Right L3
• Prone Exam: Left L3 TP Deep
• Flx/Ext Exam: Found in Neutral and Ext
• Seated correction
• Found in Ext
• Placed in Extension, Left Side bend, Left Rotation
• Resisting Flexion, Right Side, Left Rotation
• Post Tx Resist Trunk Flx (while in Ext)*
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N SR RL L3-L5
• Prone Exam: L3-L5 TP’s Deep on Right
• Flx/Ext Exam: No change
• Seated Correction
• Placed in Left Side bend, Right Rotation
• Resist Right Side bend, Left Rotation
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Treatment Post MET
• Trigger Point • Myofascial Release• Dry Needling • Myo Fascial Decompression (Cupping)• IASTM• Neuromuscular Re-ed• Glute Activation exercises
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Patient Errors
• Contraction too strong
• Wrong direction
• Contraction is not sustained long enough
• The individual does not relax completely after the correction
• Contraction should be slow build up and slow letting go
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Clinician Errors
• Poor control of positioning
• Inadequate counterforce, should be an isometric contraction
• Counterforce in wrong direction
• Contraction should be slow build up and slow letting go
• Poor patient instruction
2
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Troubleshooting
• MET may not be appropriate for every case of LBP
• If there is no change of improvement:• Could be patient/ clinician error
• Patient may not be a candidate for MET
• Look at other possible treatment options/ differential diagnosis
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Contraindications
• MET is a safe procedure • May have some soreness after
• But side effects are unlikely
• Follow the rules of MET• No pain during
• 20% of strength used
• Do not over stretch into the barrier
• Have patient assist into the barrier/ stretch2
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Resources
1. DeStefano L. Greenman’s Principles of Manual Medicine. Fourth Edition. Philadelphia, PA: Lippincott Williams & Wilkins; 2011
2. Chaitow L. Muscle Energy Techniques. Fourth Edition. London, UK: Churchill Livingstone Elsevier; 2013
3. Hengeveld E, Banks K. Maitland’s Vertebral Manipulation. Fourth Edition. London, UK: Churchill Livingtone Elsevier; 2014
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THANK YOU
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ANY QUESTIONS?