Transtibial Alignment, Biomechanics, and Gait
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21 Terms
What is the standard bench alignment for a transtibial prosthesis?
5° flexion
5° adduction
1.25 in anterior socket
1.5 in inset foot
5-7° foot external rotation
Where are pressures found within normal heel strike to foot flat on a limb?
anterior-distal, posterior proximal
Where are pressures found within normal midstance?
proximal-medial, distal-lateral
Describe Drop Off
early heel rise on prosthetic side during terminal stance/preswing and patient ‘drops off’ to their sound side quickly
What are some prosthetic causes for Drop Off?
foot too dorsiflexed
socket too flexed
short toe lever
Describe Delayed Heel Off
patient spends too much time on prosthetic side, knee may hyperextend
What are some causes for Delayed Heel Off
foot too platarflexed
socket too extended
long toe lever
Describe Vaulting
patient plantarfexes on sound side limb during single limb support to clear prosthetic side
What are some causes for Vaulting?
poor suspension
foot too plantarflexed
long prosthesis
Describe the pressure for an adducted transtibial socket
lateral proximal, medial distal
Describe the pressure for an abducted transtibial socket
medial proximal, lateral distal
Describe the pressure for an an inset foot
medial proximal, lateral distal
Describe the pressure for an outset foot
lateral proximal, medial distal
Describe the pressure for a flexed transtibial socket
posterior proximal, anterior distal
Describe the pressure for an extended transtibial socket
anterior proximal, posterior distal
Describe the pressure for a transtibial socket too anterior
posterior proximal, anterior distal
Describe the pressure for a transtibial socket too posterior
anterior proximal, posterior distal
Describe the pressure for a transtibial foot that’s too dorsiflexed
posterior proximal, anterior distal
Describe the pressure for a transtibial foot that’s too plantarflexe
anterior proximal, posterior distal
Describe the pressure for a foot too externally rotated
lateral proximal, medial distal
Describe the pressure for a foot too internally rotated
medial proximal, lateral distal
