Ankle - subtalar and transverse tarsal Flashcards
joint type of subtalar joint
three ovoid synovial joint
what are the main motions of the subtalar joint
inversion/eversion
adduction/abduction
inversion (of hindfoot) and adduction
supination
slight plantarflexion
varus movement of clacaneus
eversion (of hindfoot) and abduction
pronation
slight dorsiflexion
valgus movement of calcaneus
what are the joint motions at the subtalar joint
inversion/eversion
abduction/adduction
what motions can the calcaneous perform in weight bearing
invert/evert but cannot dorsiflex/plantarflex or abduct/adduct
*this motion is seen as inversion/varus movement or eversion/valgus movement of the calcaneus
how does the talus produce movements through the subtalar joint
through the motion of the head of the talus, seen by changes in the medial longitudinal arch
how does supination occur in the subtalar joint in CKC
calcaneous inverts
talus abducts and dorsiflex
tibiofibular lateral rotation
how does pronation occur in the subtalar joint in CKC
calcaneous everts
talus adducts and plantarflex
tibiofibular medial rotation
how does supination occur in the subtalar in OKC
calcaneous inverts
calaneous adduction and plantar flex
how does pronation occur in the subtalar in OKC
calcaneous everts
calcaneous abduction and dorsifexion
closed and open pack subtalar joint motion
closed: full inversion
open: mid inversion/eversion and mid plantarflexion/dorsiflexion
transverse tarsal joint, what is composed of and joint type
talonavicular and calcaneocuboid
joint type: modified ovoid
joint motion of transverse tarsal joint
difficult to separate and quantify function of transverse tarsal joint in open chain -- adds to subtalar range
triplanar motion at a longitudinal and oblique axis
what is the function of the transverse tarsal joint
link btw hindfoot and forefoot
add to supination/pronation ROM of subtalar joint in open chain
compensate at the forefoot for hindfoot position in closed chain
why does the transverse tarsal joint compensate at the forefoot for hindfoot position in closed chain?
to keep the foot in contact with the ground while hindfoot pronates or supinates in response to the terrain or rotations imposed by the leg
subtalar pronation
both joints in open pack position
transverse tarsal can accommodate to by moving into supination
subtalar supination
both joints approach closed pack position
transverse tarsal counters with pronation until a certain point, at which the transverse tarsal joint also begins to supinate
what happens at the tarsometarsal joint when the transverse tarsal starts to move into a closed pack position during subtalar supination
it must counter rotate to maintain contact with the ground
closed pack and open pack position of the transverse tarsal joint
closed: supination
open: mid range of supination/pronation
capsular pattern of transverse tarsal
limitation in dorsiflexion, plantarflexion, adduction and internal rotation
