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Biomechanics V2 > 7: Subtalar Joint - Frush > Flashcards

7: Subtalar Joint - Frush Flashcards

1
Q

subtalar joint =

A

articulation b/w talus and calcaneus

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2
Q

the interosseous ligament limits …

A

inversion and eversion (more)

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3
Q

the cervical ligament limits …

A

inversion

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4
Q

STJ axis

A

42 degrees from the transverse plane

16 medial deviation from sagittal plane

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5
Q

motion STJ joint

A

inverion eversion and abduction adduction

little dorsiflexion plantarflexion

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6
Q

transver and frontal : sagittal

A

3:1

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7
Q

open kinetic chain supination

A

inversion, plantarflexion, adduction

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8
Q

open kinetic chain pronation

A

eversion, dorsiflexion, abduction

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9
Q

what does the STJ do during 1st and last half of OKC?

A

1st - pronates (allows for ground clearance)

Last - starts to supinate

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10
Q

just before heel strike

A

STJ in neutral

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11
Q

at heel strike

A

STJ supinated

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12
Q

what will you see during CKC?

A

inversion and eversion of calcaneus will be only thing externally visible

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13
Q

CKC supination

A

calcaneal inversion
talar dorsiflexion and abduction
tibial external rotation

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14
Q

CKC pronation

A

calcaneal eversion
talar plantarflexion and adduction
tibial internal rotation

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15
Q

CKC internal leg rotation =

A

talar adduction

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16
Q

CKC external leg rotation =

A

talar abduction

17
Q

because CKC talus and leg are proximal to axis, will act in _______ motion of calcaneus

A

opposite

18
Q

allows foot to become mobile adaptor and allows for shock absorption

A

STJ heel strike and starting to pronate

19
Q

during CKC midstance, the STJ starts to …

A

supinate (to allow for heel off, foot becomes rigid lever)

20
Q

how do you find STJ neutral?

A

palpate talar neck and move foot back and forth until it feels equal medially and laterally

21
Q

STJ total ROM

A

30 degrees

20 calcaneal inversion/ supination, 10 eversion/ pronation

22
Q

how do you calculate STJ neutral through ROM?

A
  • prone pt
  • bisect calcaneus and lower leg
  • invert calcaneus to end ROM and measure angle
  • evert calcaneus to end ROM and measure anlge
  • add measurements together and divide by 3 (* if this number less than measured eversion = valgus, greater than eversion = varus)
  • subtract this number from measured eversion
    = calculated STJ neutral
23
Q

describe the kirby method

A
  • pt in STJ neutal nonweightbearing
  • push onmedial foot and lateral foot until coming to point where foot does not move
  • do at least 3 pts
  • assumes the normal STJ axis passes through the posterior-lateral heel and through the first intermetatarsal space of platnar foot anteriorly
24
Q

if STJ is laterally located (kirby method) …

A

foot supinates easily

if medially located, foot pronates more easily

25
Q

position of STJ (calcaneus) when pt is fully compensated in midstance

A

releaxed calcaneal stance position

26
Q

how do you measure the RCSP

A
  • bisect calcaneus
  • have pt stand and march in place
  • measure calcaenal bisection in relation to weightbearing surface
27
Q

normal RCSP

A

2 degrees varus to valgus

28
Q

compensation rules for RCSP

A

varus= calcaneus will be vertical if fully compensated

valgus = neutral 2-10 degrees = foot will pronate/evert to maximum ROM
- if over 10 degrees = talar head hits fround and prevents further pronation

29
Q

position of STJ when pt is placed in neutral position while standing

A

NCSP neutral calcaneal stance position

30
Q

how do you measure NCSP

A
  • bisect calcaneus
  • march pt
  • have pt slowly invert and evert until neutral talus is palpated
  • measure calcaneal bisection in relation to weightbearing surface
31
Q

normal tibial stance position

A

0-4 degrees varus

32
Q

what is the tibial stance position?

A

bisection of lower leg (tibia) in relation to ground while in NCSP

33
Q

adding the tibial stance position to STJ neutral =

A

neutral calcaneal stance position

34
Q

if pitch of STJ is higher than normal, what type of increased motion will be seen?

A

abduction and adduction

35
Q

a pt has 22 degrees inversion and 14 degrees eversion, what is their neutral position?

A

2 degrees everted (valgus)

36
Q

during CKC pronation, the calcaneus …

A

everts

Biomechanics V2 (12 decks)

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