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GC SLS (Swing Phase)

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aacilla's version from 2017-08-15 08:16

Initial Swing

Question Answer
What percentage of the GC does this phase make up?62-75%
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What is the objective of this phase: foot clearance, advancement of limb from trailing position
Question Answer
What phase is the contralateral leg in?Midstance
What is most apparent at this phase?foot drop
What is the position of the ankle in initial swing?PF decreases from 20-5º
What muscle concentrically initiates dorsiflexion in initial swing?Anterior tibialis.
What is the position of the sub-talar joint in initial swing?neutral!
What is the position of the knee in initial swing?Flexion 40-60 degrees (for good clearance of the ground!)
In a slower paced walk, which muscles help with knee flexion in initial swing? (they concentrically do this).biceps femoris, gracilis, and sartorius.
What is the position of the hip in initial swing?flexed 0-15 degrees
Which muscle is primarily responsible for the hip positioning in initial swing?Iliopsoas (concentrically firing)
What is the position of the pelvis in initial swing?5 degrees of backward rotation, and rotated posteriorly.
Hip muscle activityHF flex hip, adductor longus brings leg toward midline
Knee muscle activityLateral hamstrings help flex knee (sartorius), RF (ecc)
Ankle muscle activityTA (conc) initiate DF to clear toes
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Midswing

Question Answer
What percentage of the GC does this phase make up?75-87%
What is the objective of this phasefoot clearance, advancement of limb
What phase is the contralateral leg in?Midstance
What is the position of the ankle in mid swing?dorsiflexed to neutral (10–0 degrees) achieving foot clearance off the ground!
Which muscle controls the ankle and foot positioning, and does it fire eccentrically or concentrically?Anterior tibialis, concentrically!
Common belief that anterior tibialis actually falls silent in this phase of mid swing, true or false?True
What position is the sub-talar joint in during mid swing?Neutral.
What position is the knee going into during midswing?reaches 62º flexion then begins extension up to 25 degrees.
The motion of the knee going into it's position in mid swing is caused by what force?MOMENTUM! No muscle activity is required.
What position does the tibia obtain during knee positioning in mid swing?Vertical!
What is the position of the hip during mid swing?15-25 degrees of flexion
At the end of the hip positioning in mid swing, does hip flexor action continue to go on, or cease?CEASE!
What is the position of the good ol pelvis during mid swing?Forward and posterior rotation to neutral.
Hip muscle activityhip flexors and momentum flex hip
Knee muscle activityHams begin to decelerate KE
What created the KE?tibial forward momentum
Ankle muscle activityTA (conc) contract to clear foot
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Terminal Swing

Question Answer
What percentage of the GC does this phase make up?87-100%
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What is the objective of this phase: complete limb advancement, prepare foot for stance
Question Answer
What phase is the contralateral leg in?terminal stance
Ankle positioning in terminal swing?it remains in neutral! positioned for heelstrike
Is the anterior tibialis active or passive in this terminal swing phase, and why?active in order to pre position the foot for initial contact! (preparing to land!)
What is the sub-talar joint position in terminal swing?Neutral
What is the knee position in terminal swing?Extension to neutral. 25º flexion -0º
Which muscles are controlling the knee positioning in terminal swing?Hamstrings to deccelerate the thigh and leg movements into extension, by eccentric firing.
Which muscles are preparing the knee for initial contact in terminal swing phase?The quads (concentrically)
What is the hip position in terminal swing?25º flexion
Which muscles are preparing the stabilization of the hip during weight acceptance in initial contact?The hamstrings (eccentrically deccelerating the thigh) and the glut max (initialting activity)
What is the position of the pelvis in terminal swing?5 degrees of forward rotation.
Hip muscle activityHF restrained by gluteus max. and hams
Knee muscle activityhams continue to decelerate forward swing of leg, quads may contract for KE in prep for IC
Ankle muscle activityTA (iso) contract to prep foot for IC
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