Transtibial Prosthesis Flashcards
decreased heel lever, increased toe lever
stability
stabillity
GRF anterior to knee
GRF anterior to knee
promotes knee extension
adjustments to socket for stability
socket extension, socket posterior to foot, foot PF, foot anterior to socket, softer heel cushion/PF bumper
what patients benefit from stability
patients with weak quads
increased heel lever, decreased toe lever
mobility
mobility
GRF posterior to knee
GRF posterior to knee
promotes knee flexion
adjustments to socket for mobility
socket flexion, socket anterior to foot, foot DF foot posterior to socket firm heel cushion/ PF bumper
bench alignment
5 flexion
5 adduction
foot slightly medial
with greater heel lever/lesser toe lever, there is ______ IC and _________ early stance
abrupt, quick
with shorter heel lever, longer toe lever, there is __________ in toe off
delay
if PF bumper is soft….
heel lever will be functionally shorter = increase stability
if PF bumper is firm…..
it won’t allow for eccentric PF to occur at IC… resulting in quick early stance (increased mobility)
if DF bumper is firm (in late stance), patients will complain of:
feeling like they are walking up hill (stability because it won’t allow for excessive DF)
pressure tolerant areas
patellar ligament
gastroc belly (posterior compartment)
proximomedial aspect of leg (medial tibial flare/shaft)
anterolateral aspect of leg (lateral fibular shaft)
pressure sensitive areas
heal of fibula tibial crest tibial condyles distal ends of fibula/tibia hamstring tendons
poor control of knee
socket tilted into extension or shifted posterior to foot - increase knee stability
strong and active patient
socket tilted into flexion or shifted anterior to foot - increase knee mobility
excessive medially (in frontal plane)
increase pressure on distal end of fibula
excessive laterally (in frontal plane)
increase pressure on fibular head
if heel is raised (but no contracture)
excessive weight anteriorly = jeopardizing knee stability
if forefoot raised
excessive weight posteriorly = difficult to flex the knee during walking
if lateral border is raised
excessive WB medially - pressure of fibular head