ankle and foot pt 3 Flashcards
what is the job of the tarsometatarsal joint?
attempts to maintain forefoot contact with supporting surface especially when transverse tarsal motion is inadequate
what is the motion that occurs at the tarsometatarsal joint?
considered triplanar joint but not supination pronation but rather supination twist and pronation twist (bc not much abd/add)
how are the axes in the tarsometatarsal joint?
independent oblique axes for each ray
what are the coupled motions for the 1st and 2nd ray axis?
inversion with DF
eversion with PF
what are the coupled motions for the 4th and 5th ray axis?
eversion with DF
inversion with PF
what motion occurs at each ray when the foot is inverted?
1 and 2 DF
4 and 5 PF
what motion occurs at each ray when the foot is everted?
1 and 2 PF
4 and 5 DF
what motions occur if transverse tarsal supination is inadequate to offset hindfoot pronation?
medial foot will compress into the ground
lateral side will tend to lift off ground
1st and 2nd ray will DF and invert
4th and 5th ray will PF and invert in attempt to contact the ground
the entire foot inverts or supination twists
if in CKC 5th ray will PF and IV which is?
supination twist
if in CKC 5th ray will DF and IV which is?
pronation twist
what does too much varus NWB lead to?
supination twist
describe which motion is occurring at the TMT joint?
calcaneus eversion
talar adduction and PF
talonavicular PF
TMT DF and IV (1st and 2nd ray)
TMT PF and IV (4th and 5th ray)
supination twist
describe which motion is occurring at the TMT joint?
calcaneus inversion
talar abduction and DF
talonavicular DF
TMT PF and EV (1st and 2nd ray)
TMT DF and EV (4th and 5th ray)
pronation twist
when does pronation and supination twist of the TMT joints occur?
when the TTJ function is inadequate:
unable to counter rotate or is insufficient to fully compensate for hindfoot position
when do plantar arches evolve?
during childhood (5 years old) with WB progression
what are the plantar arches?
the structural vault of the foot. twisted osteoligamentous plate with anterior margin horizontal and posterior margin vertical
what is the design purpose of the plantar arches?
design allows absorption and distribution of BW forces
what do plantar arches tend to do?
flatten with WB
describe the transverse plantar arch?
osteoligamentous twist imposes both a longitudinal and transverse arch