subtalar joint

Question 1

what in STJ limits inversion and eversion but mostly eversion

Answer 1

interosseous ligament

Question 2

what limits inversion in STJ

Answer 2

cervical ligament

Question 3

STJ axes

Answer 3

42 inclination from the transverse plane

16 deg medial deviation from sag plane

predominant frontal/transverse

Question 4

STJ normal motion? what is the ratio of motion

Answer 4

inversion/eversion,abduction (3):(1) dorsiflexion/plantarflexion

Question 5

what does supination and pronation consist of in OKC

Answer 5

supination: inversion/ plantarflexion, adduction
pronation: eversion, dorsiflexion abduction

Question 6

how is the process of OKC of the STJ

Answer 6

STJ pronates during 1st half of OKC during gait–>allows for ground clearance

2nd half: supination. the STJ is neutral just before heel strike
@ heel strike, STJ is supinated—more stable position

Question 7

position of the STJ in closed kinetic chain

Answer 7

supination:

• calcaneal inversion, talar dorsiflexion and abduction
  tibia: external rotation

pronation:

• calcaneal eversion
• talar plantarflexion and adduction
• tibial internal rotation

but will only see calcaneal inversion/eversion

Question 8

what is the talus position during internal/external leg rotation during in CKC

what is relation of the talus and calcaneus

Answer 8

internal leg rotation: talar adduction

external leg rotation: talar abduction

talus and calcaneus are opposite motion of each other

Question 9

what position of STJ is when they are a “mobile adaptor” and shock absorption

Answer 9

pronation CKC

Question 10

what position of STJ is foot a rigid lever in CKC, when does this occur? what happens if theres too much of this motion?

Answer 10

supination–to propulse off the ground

too much supination–prevent shock absorption

Question 11

STJ ROM

Answer 11

30 deg total ROM
2(supination):1 pronation

every degree of pronation, 2 degrees supination
20 deg inversion
10 deg eversion

Question 12

when is STJ is fully compensated

Answer 12

mistance

Question 13

what is the normal position of relaxed calcaneal stance position

Answer 13

2 degree varus to 2 degree valgus

Question 14

what does the kirby method measure

Answer 14

stj axis deviation

Question 15

what is the normal STJ axis position

Answer 15

pass Posterior-lateral heel posterior–>1st intermetatarsal space of the plantar foot anteriorly