core implications for the extremities -...
TRANSCRIPT
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Core Implications For the Extremities
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Core Stability
• Not new stuff• Everyone’s jumping on the bandwagon
– PT, ATC, CSCS, Fitness IndustryEven the researchers – easier to get funding if you mention the spine
• Conceptual Framework in place since 1950’s– Clinically: last 20 years– The research has now paralleled what we
do in the clinic
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History of Core Stability*Gets everyone on the same page
• 1950 – Kendall Stability through the core– Activate the Transverse Abdominus and Multifidus
• 1970 – Janda “Pelvic Cross” Framework• 1980 – Sahramen Focused on the chronic
malignment that occurs when muscles get stretched or weak
• 1980’s – Richardson Activation of the Transverse Abdominus through “Abdominal Hollowing” looking at local muscles vs. the pelvic clock and global muscle approach
• 1990’s – McGill – Biomechanist “Abdominal Bracing”
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Why Core Stability? Because our bodies were designed to produce and most importantly reduce force
• Ex: anatomic action vs. functional action Glut Medius
• Muscles have anatomical individuality but do not function that way
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Why Core Stability?
• 60% of our bodies mass is in the trunk• We need to control and consider this to
optimize LE and UE function
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Core and Kinetic Link Evidence…
• 34% more rotational stress to the Glenohumeral joint when there is a 20% loss of trunk power-Kibler 2001
• 64% of shoulder patients will have scapular asymmetry-Micheli
• 23.6% loss of elevation ROM and 16% loss of strength with T-SPINE Kyphosis- Kebaetse et al 1999
• 23-38 degrees of loss of trail arm ER in the golf swing :senior player
vs. early 20”s player-Baker, Mitchell 2003
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Core Drawing
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Fundamentally you have…
• Local Muscles– Transverse Abdominus, Multifidus, Internal
Obliques, Diaphram, Pelvic Floor muscles
• Global Muscles– Rectus Abdominus, Erector Spinae, External
Obliques
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Erector Spinae Transverse Abdominis Multifidus
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Local Muscles
• Directly control the lumbar segment
• Deep “corset like” action – essential for core stability-via the “Hoop Mechanism”
• Posture/positional sensory sense – Proprioception
inhibition of these muscles – chronic LBP
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How does the Transverse Abdominus (TA) work?
• Wraps around the spine and blends into the thoracolumbar fascia and thus attaches to vertebrae ( the TA contracts pulls on the fascia and thus provides intrinsic stability)
• Increases intra-abdominal pressure –acts like a canister with the diaphragm , pelvic floor – increasing the abdominal pressure creates an extension moment at the spine and thus stability-which decreases compressive forces
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How does the Multifidus work?
• Increases rotational segmental stability• Contributes 2/3 of the segmental stability• Fatigue resistance-type I fibers –slow
twitch
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Global Muscles
• Control movement around the spine relative to the rib cage and pelvis
• Core Training/Power-conditioning in a specific movement-dynamic
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So What is Core Stability?
• Local and global muscles working together.
• Proper activation of these muscles.• It is oversimplified • Abdominal crunches are not core stability
exercises• Stability means NONO
FLEXION,EXT,ROTATION
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Core Stability Objective?
• Neuromuscular Control• Proper Activation Pattern of Upper and
Lower Extremity Movements will occur if core muscles are firing properly
• “Corset Like” Action – Spinal Segmental Stability
• Balance of the motion segment
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Intro Summary-So Why Core Stability?
• What happens at the core influences the pelvis and thus the upper and lower extremities
• In order to have proper integration of efficient movement performance of kinetic chain you need proper activation patterns of the core
• Intrinsic stability first Extrinsic stability• Lumbopelvic Stability Pelvicfemoral stability
Thoracolumbar stability Scapulothoracic stabilityScapulohumeral Stability etc… it’s a chain reaction More on this later…
• Implications on injury prevention and rehabilitation– High level athlete / patients– Low level patients
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Technique of Core Stability
• Must successfully have local and global neuromuscular activation
• “Neutral” spine position – clinically small lumbar curve – slight activation of erector spinae
• Strict initiation of intrinsic local muscle contracture via the “Drawing in Mechanism” –”BBTS”
• Abdominal Hollowing
Reference: Richardson - McGill
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Two Methods:
1. Train the Locals2. Train the Global Ms
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Bracing vs. Hollowing?
• The literature has looked primarily at lumbopelvic stability so there is a bias towards bracing for spine stability
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So what is the best method?
• Training the local muscles or the global muscles?
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Objective Exam LE/UE
• Start with a little bit more “core awareness”• Evaluate from the “inside out”• Proximal Stability for Distal Mobility (medical
model often leaves this fundamental out)• Our bodies are designed to produce and
reduce force-need to have a stable and correct activation of the core muscles to do this efficiently and therefore less compensation to the entire chain
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CLINICAL IMPLICATIONS• “Inside out approach”• Small postural position sense muscle inhibited• Overall integration of the kinetic link-remember
that muscles have anatomical individuality but not functional individuality
• We all know and treat high and low level demand patients that function fine, however…
• UE-Examples-influence of a weak core• LE—Examples-influences of a weak core
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Lack of Trunk Control
• 60% of total body mass
• Need to control this in deceleration activities– landing, running, and cutting
• Important to control this huge mass especially in change of direction in sports
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Upper Extremity-Let’s Discuss• Weak and inhibited core causes over
activation of global extrinsic muscles i.e. Thoracolumbar fascia / Latissamus Dorsi
• Tight ‘lats’ increases medial rotation of the humerus – forward tipping of scapula THUS, anterior superior migration of the humeral head occurs Impingement/RTC dysfunction
• 16% less elevation strength and 24% active shoulder elevation
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Upper Extremity con’t
• Weakened and inhibited gluteus medius post THR – downward and forward rotation opposite shoulder – incidence of RTC dysfunction opposite THR
• Baseball Pitchers • 34% more rotational stress to the
shoulder when there is a 20% decrease in trunk strength
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Janda – Pelvic Cross Syndrome
• Weak and inhibited Abdominals• Weak and inhibited Glut Max/Med• Tight Hip Flexors• Results in loss of hip extension• Loss of lateral pelvic control• ITBFS Trochanteric Bursitis, lateral knee pain,
“piriformis syndrome”• Cascade – domino effect abdominal muscle /
joint tissue loads resulting in pain and dysfunction
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Core Assessment - Clinical
• Postural Assessment– Hyperlordotic posture – tip that intrinsics
are weak and inhibited – erector spinae dominance
– Abdominal Protruding – Pouching out sign that you have lost the intrinsic control
– Look for forced postural changes
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Core Assessment-UE Swimmer
• How do we identify a weak core? -- Clinically
• Core Stability – Where do I start? What level?
• A common problem is starting at a level that is too advanced
• How to incorporate into your current rehab plans
• Where you fail is where you start
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LOWER EXTREMITY-Also starts with trunk control
• Occurs at 3 levels– Local Spinal Control – Position Sense
• Muscles that can influence/control intervetebral motion
– LumboPelvic Control – Controlling the thoracic cage on the pelvis
– Overall whole body posture – the global muscles attach the thoracic cage to the pelvis, THUS controlling the majority of the body “mass”
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Lower Extremity
• Dynamic loading activities
• Proper activation of Transverse Abdominus controls trunk flexion and the chain reaction i.e. SOFTER LANDING-less repetitive compensation-our bodies are great at compensating-it is the repetition that we have to control
• Mechanism of injury – landing MOI – ACL
• Classic landing mechanism– pronated foot, ER tibia, IR femur, genu valgum,
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4-2-05
3-5-05
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CARLY
• Let’s assess the good side……….
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CARLY
• Let’s assess the involved side……….
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Clinical Progression-Level One goal-activation of local muscles
• Supine- “Draw in and up”-hips and knees at 45 deg 30 sec contraction 5-8 reps
**watch for loss of natural lordosis which means poor transverse Abdominis control
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Level 2-goal alternating arms and legs without loss of local control (TA and
Multi)• Supine ex- alternate arm flexion then to
arm and leg flexion• Quadruped ex-arm flexion to alternate arm
and legs
• 3 sets for one minute- 1-2 sec concentric 2-3 sec eccentric rhythm
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Level 3-Weight Bearing and Multi Plane Movements
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Level 4-Continued Multi Plane with faster pace of movement
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Putting it all together- Sequencing
• Release tight muscles first- set core before stretching
• Proceed through your core program• Remember where you fail is where you
start• Document postural changes, reps and
ability to perform exercises etc
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REVIEW: Stability Exercise vs. Training Exercise- remember to set local muscles first
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TRAINING AND RX TIPS
• Remember that you activate your intrinsic core muscles first when walk – step etc.
• Rehab all planes and contraction types• Change speeds and angles to progress• Stay basic and boring-Fundamental’s• Because a lot of our balancing/core PT Ex’s
look like a circus act and create nothing but compensation
• DRAW-IN MECHANISM-Before you do any ther-ex’s
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TRAINING AND RX TIPS CON’T
• Core training and power-chops, lifts etc remember to “Draw-in” first
• Transitional movements will expose postural change, compensation and the real cause of the pain and dysfunction.
• Ex: impact landing-soft or hard?• TRUST YOUR EARS AND YOUR EYES• Remember “in every patient lies the truth”
James Cyriax MD
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TRAINING/RX TIPS Con’t
o Remember the kinetic link: Lumbopelvic: patellafemoral, scapulothoracic etc
o Remember a lot of highly trained athletes and patients function with over dominant
o Global muscles potentially resulting in overcompensation and pain
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Training Faults and Misconceptions
“Practice today become habit tomorrow” Duane Saunders, PT
• Too many so called “Core” exercises – too difficult for our patients-they are “training a plane vs. “stability”
• Compensation results in the dominant global muscles taking over – sloppy technique*Only getting about 50% of the benefit
• Program are strength based sets and reps– “3 sets of 10” vs. Neuromuscular activation force tension
development
• Need to instill the constant activation of the i t i i ith ADL’
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Core References• Kibler W.B., Press J., Sciasscia A. The role of core stability in
athletic function. Sports Medicine. 2006; 36(3): 189-198.• Wilson J.D., Dougherty C.P., Ireland M.L., Ireland M.D. Core
stability and its relationship to lower extremity function and injury. Journal of the American Academy of Orthopaedic Surgeons. 2005; 13:316-325.
• Panjabi M.M. The stabilizing system of the spine. Part II. Neutral zone and stability hypothesis. Journal of Spinal Disorders. 1992; 230; 20-4.
• Bergmark A. Stability of lumbar spine. A study in mechanical engineering. Acta Orthopaedic of Scandinavia. 1989; 230; 20-4.
• Cordo P.J., Nashner L.M. Properties of postural adjustments with rapid arm movements. Journal of Neurophysicology. 1982; 47(2): 287-308.
• As well as the work by Sahrmann, Janda, Kendall and Hodges
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Thank You !
• Andrew Graham-for IT support and video taping
• Eoin Colleran-research assistance