Normal Gait Cycle
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Normal Gait Cycle

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normal yürüme analizi- normal gait cycle

normal yürüme analizi- normal gait cycle

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Normal Gait Cycle Normal Gait Cycle Presentation Transcript

  • NORMAL GAIT CYCLE Emine CAN HACETTEPE UNIVERSITY- Depatment of Electrical Electronics Engineering
  • Gait Cycle .
    • P eriod of time
    • from
    • one heel strike
    • to the next
    • heel strike of
    • the same limb
  •  
  • Gait Cycle
  • Gait Cycle
    • > Time Frame :
      • > > Stance vs. Swing:
        • Stance phase = 6 0 % of gait cycle
        • Swing phase = 40 %
      • > > Single vs. Double support:
        • Single support = 40% of gait cycle
        • Double support = 20%
  •  
  • STANCE( support ) PERIOD Begins when the heel of the forward limb makes contact with the ground and ends when the toe of the same limb leaves the ground.
      • Foot in contact with the ground
  • SWING ( unsupported ) PERIOD Begins when the foot is no longer in contact with the ground. The limb is free to move. Foot not in contact with the ground
  • The Tasks of the Gait Cycle
    • Weight acceptance
      • > The transfer of body weight onto a limb that has just finished swinging forward and has an unstable alignment.
      • > Shock absorption and the maintenance of a forward body progression
    • S ingle limb support
      • > One limb support the body weight
      • > Same limb provide truncal stability while bodily progression is continued
    • L imb advancement
      • > Requires foot clearance from the floor
      • > The limb swings through three positions as it travels to its destination in front of the body.
  • STANCE Subphases IC : Initial Contact (Heel Strike)
    • > Both limbs are in contact – Double stance
      • > The heel strikes the ground > The stance knee begins to flex slightly.
      • > The ankle is at the neutral position
      • > The knee is close to full extension Knee – 0 o Flexion, Tibia externally rotated
      • > Hip 30° of flexion Femur externally rotated
      • > In the sagittal plane, the alignment of the ground-reaction force vector at initial contact is posterior to the ankle joint, creating a plantarflexion moment
      • > Maximum hip flexion occurs during initial contact.
  • STANCE Subphases LR : Loading Response ( Foot Flat ) > Flattening of the foot – reacting to impact of body weigh t > Double stance ends > Knee – 15 o flexion, tibia internally rotates and then begins to externally rotate > Hip – 30 o flexion, femur internally rotating moving to neutral > Maximum Impact Loading occurs > Foot rapidly moves into pronation > Weight has been shifted to the support leg
  • STANCE Subphases MS: Mid Stance Early Midstance - Late Mid Stance
    • > Single stance > Knee – 15 o flexion, tibia externally rotating
      • > Hip – 25 o flexion, femur internally rotated
  • STANCE Subphases TS : Terminal Stance ( Heel-off ) > Single stance – “Falling forward” forward fall of the body moves the vector further anterior to the ankle, creating a large dorsiflexion moment > Begins as COG passes over foot and ends when opposite foot touches ground
      • > Knee – 5 o flexion to 0o, tibia externally rotates
      • > Hip – 0 to 10 o extension, femur externally rotates and begins abduction
  • STANCE Subphases PS : Pre-Swing ( Toe-Off/ Knee Break)
    • > Double stance – “Transition” > Limb is rapidly unloaded – “Toe-off”
      • > Knee – 0-30 o flexion, tibia externally rotates
      • > Hip – 20 o extension, femur externally rotates with abduction
      • >The ankle moves rapidly from its dorsiflexion position at
      • terminal stance to 20 degrees of plantarflexion
  • SWING Subphases IS : Initial Swing ( acceleration )
    • > From “toe-off” until maximum knee flexion
      • > Knee – 30–60o flexion, tibia internally rotates
      • > Hip – 0–20o flexion, femur moves from
      • internal rotation to neutral (externally rotating)
  • SWING Subphases MS : Mid Swing
    • > Goal is for tibia to reach vertical position perpendicular to surface
    • > Knee – moves to 0 o , tibia externally rotates
    • > Hip – 20-30 o flexion, femur externally rotates
    • > Knee extension and hip flexion continue by inertia
  • SWING Subphases TS : Terminal Swing
    • > Preparing for initial contact
    • > Knee – 0 o , tibia externally rotated
      • > Hip – 30 o flexion, femur externally rotates
  •  
  • State to State Conditions
  • bibliography
    • UNDERSTANDING NORMAL & PATHOLOGICAL GAIT
    • Mahmoud Sarmini, M.D.
    • Assistant Prof. LSU-PM&R
    Gait Evaluation Joshua Landau, MD Gar Wynne, MD http://www.upstate.edu/cdb/grossanat/limbs6.shtml http://www.upstate.edu/cdb/grossanat/limbs6.shtml