Gait and posture 1 Flashcards
Gait
Translocates centre of body mass in direction of locomotion (walking), generally symmetrical need all body weight, cyclical activity (1 sec)
Normal gait relies on
- Joints
- Muscles
- Nerves
- Vision
Joints
Intact bones and well functioning joints
Vision
Information about movement and surroundings, automatic balance, vestibular and auditory systems
Everybody’s gait different due to
- Stride length
- Pelvic movement
- Upper body position
Reasons for changes in elderly
Muscle start to atrophy, reduce strength and flexibility and loss of hearing and vision
Changes in gait in elderly
Reduction in overall velocity and strep/stride length, not swing arms as much, decreased rotation of pelvis, flat footed
Gait cycle
1 leg, heel strike, loading response, midstance, terminal stance (heel off), preswing (toe off), initial and mid-swing, terminal swing
2 phases of gait cycle
- Stance (60%, in contact with ground)
2. Swing (40%, in air)
Start and end of stance phase marked by
Short period of double support (10%) - both feet on ground
Stance phase
Heel strike, loading response, mid-stance, terminal stance, pre-swing
Swing phase
Initial swing, mid-swing, terminal swing
Isometric contraction
Contracts without changing in length (not moving it)
Dynamic contraction
Contracts with a change in length
2 types of dynamic contraction
- Concentric - shorten
2. Eccentric - lengthens (control descent of arm)
Heel strike
1st part, ankle dorsiflexed, lower foot carefully by eccentric contraction of tibilais anterior, deceleration of movement by gluteus maximus, longitudinal arch of foot maintain by intrinsic muscles, ankle and subtalar joint accommodate terrain
Loading response
Foot flat on ground, all body weight on one limb, requires knee extension to prevent buckling under weight - quadriceps femoris contracts, continued hip extension and preservation of longitudinal arch
Mid-stance
Opposite leg swings past, stabilise pelvis (gluteus medius and minimus and tensor fasia lata - abduct hip)
Terminal stance
Heel starts to lift off grand, achieved by plantar flexors (soleus and gastrocnemius - triceps surae), accelerates mass forward
Pre-swing (toe-off)
Powerful plantar flexion of digits - push off grand and accelerate mass forward, slowing of hip extension and preparation for hip flexion (eccentric contraction of rectus femoris)
What is essential for toe-off?
Hallux/big toe, stabilised by adductor hallucis and adductor hallucis brevis
Misaligned or missing hallux
Weak push off (apropulsive gait) > shorter stride length and decreased gait velocity
Hallux valgus
Lateral deviation of hallux
Hallux amputation often due to
Diabetes
Initial and mid-swing
Hip flexion carries limb forward (iliopsoas and rectus femoris), toes and foot dorsiflexed so dont drag (tibilias anterior), and helped by knee flexion 65 degrees (hamstrings)
Terminal swing
Knee flexion > extension (quadriceps), dorsiflexion of ankle (tibilalis anterior), eccentric contraction of hamstrings decelerates limb in prep for heel-strike
Swing problems
If can’t shorten limb by knee flexion foot drop
Remedy of swing problems
Swinging leg movement in arc (circumduction) to avoid dragging on ground
Foot can’t dorsiflex
Footdrop - common perineal nerve
Footdrop remedy
Flex knee higher/circumduct
Stance limb
Internal rotation (gluteus medius and minimus, tensor fascia lata), also keep knee slightly flexed - minimises vertical rise
Swing limb
External rotation (piriformis, quadratus femoris, obturator internus and externus, superior and inferior gemelli)
Energy efficient
Minimises centre of gravity moving - only move forward
Pelvic rotation reduces vertical drop
Just walk forward not up and down
Pelvic drop
Helps minimise rise to COG as walk, gluteus medius and maximus minimise drop
Trendelenberg gait caused by
Gluteus medius and maximus not working
Trendelenberg gait sign of
Stroke, cerebral palsy (UMN), hip osteoarthritis, superior gluteal nerve damage
Hip adduction
Minimises lateral shift, pull knee into midline, if not active very wide based gait knees not being drawn in
Bipedial gait
Short legs, short arms, evolution (walking on hands and knees)