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Midtarsal joint
2nd biomechanics exam
17
Medical
Professional
02/17/2013

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Cards

Term
chopart's joint
Definition
made up of the talonavicular and calcaneocuboid joints
Term
ligaments of the midtarsal joint
Definition
bifurcate ligament
short plantar ligament
long plantar ligament
spring ligament
Term
longitudinal axis
Definition
15 degrees from transverse plane
9 degrees from sagittal plane
primarily frontal plane motion - inversion and eversion
Term
oblique axis
Definition
52 degrees from transverse plane
57 degrees from sagittal plane
dorsiflexion with ABduction
plantarflexion with ADduction
Term
"secondary ankle joint"
Definition
oblique axis - can compensate for lack of ankle dorsiflexion
Term
STJ pronation
Definition
MTJ axes become more parallel
this "unlocks" MTJ
allows foot to become a mobile adaptor
Term
STJ supination
Definition
MTJ axes cross
this "locks" MTJ
allows foot to become a rigid lever
Term
OKC - contact period of gait
Definition
OA - pronated
LA - supinated
STJ - pronating allowing shock absorption
Term
CKC - midstance
Definition
OA - pronated
LA - pronated
STJ - supinating in preparation for propulsion
Term
CKC - propulsion
Definition
OA - supinated
LA - pronated
STJ - supinated
Term
windlass effect
Definition
as heel lifts during gait, toes passively dorsiflex
met heads acts as a pully mechanism
Term
uncompensated forefoot varus
Definition
forefoot varus greater than calcaneal eversion available - calcaneus can't evert past neutral
Term
partially compensated forefoot varus
Definition
forefoot varus greater than calcaneal eversion available - calcaneus can evert but not to same degree as forefoot varus
Term
compensated forefoot varus
Definition
forefoot varus equal or less than available calcaneal eversion
Term
order of compensations for forefoot valgus (LASOS)
Definition
LA supination
STJ supination
OA supination
further STJ supination
Term
flexible deformity
Definition
if only LA compensation is needed
Term
rigid deformity
Definition
if STJ or OA compensation is needed
heel will be inverted
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