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kines final > talocrural joint > Flashcards

talocrural joint Flashcards

(53 cards)

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1
Q

what is considered to be the ankle joint

A

talocrural joint

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2
Q

articulation

A

b/w the talus and the distal tibia

and

the talus and the fibula

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3
Q

what type of joint is the talocrural joint

A

hinge joint with one degree of freedom

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4
Q

what does the talocrural joint allow

A

dorsiflexion and plantar flexion

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5
Q

what is the most congruent joint in the body

A

talocrural joint

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6
Q

what is the proximal surface of the talocrural joint composed of

A

the concave surface of the distal tibia and the tibial and fibular malleoli

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7
Q

what will form the almost continuous concave joint surface –> proximal surface

A

three facets

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8
Q

which malleolus extends further distally

A

the lateral malleolus

is also more posterior

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9
Q

what shape does the distal tibia and the malleoli resemble

A

mortise

adjustable and relies on the proximal and distal tibiofibular joints to both permit and control change in the mortise

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10
Q

distal surface of the talocrural joint

A

formed by the body of the talus

has 3 articular surfaces

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11
Q

3 articular surfaces of the talus –> distal surface

A

large lateral facet

smaller medial facet

superior/trochlear facet

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12
Q

large lateral facet

A

lateral malleolus

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13
Q

smaller medial facet

A

medial malleolus

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14
Q

superior/trochlear facet

A

articulates w/ distal tibia

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15
Q

what shape is the body of the talus

A

wedge shaped

wider anteriorly than posteriorly

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16
Q

articular cartilage –> distal surface

A

continuous across 3 articular facets

very congruent joint

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17
Q

proximal tibiofibular joint

A

formed by the head of the fibula w/ the posterolateral aspect of the tibia

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18
Q

what kind of joint is the proximal tibiofibular joint

A

plane synovial joint

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19
Q

proximal tibiofibular joint capsule

A

reinforced by anterior and posterior ligs

separate from knee joint

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20
Q

amount of motion at proximal tibiofibular joint

A

small amount of motion

superior/inferior sliding of the fib

fib rotation

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21
Q

distal tibiofibular joint

A

concave facet of the tibia and the convex facet of the fibula

syndesmosis

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22
Q

distal tibiofibular joint capsule

23
Q

distal tibiofibular joint ligaments

Study These Flashcards
A

most important is the crural tibiofibular interosseous ligament

injured in a high ankle sprain

24
Q

fxn of distal tibiofibular joint

Study These Flashcards
A

limit motion @ tibiofibular joints

maintain a stable mortise

25
what is normal fxning of the talocrural joint dependent on
tibiofibular mortise
26
what is the mortise spread apart
it would be unable to grasp and hold the talus
27
what is the most important part of the mortise
fibula will bear no more than 10% of our weight
28
ligaments of talocrural joint
medial collateral ligament (deltoid ligament) lateral collateral ligament
29
purpose of ligaments
ankle is dependent on intact ligamentous structure for stability joint capsule of the ankle is fairly thin and is weak anteriorly and posteriorly
30
deltoid ligament
superficial and deep fibers arise from the borders of the tibial malleolus insert in a continuous line on the navicular anterior and on the talus and calcaneus distally and proximally
31
is the deltoid ligament weak or strong
very strong ligament
32
fxns of the deltoid ligament
control medial distraction (valgus) stresses on the ankle joint help check motion at extreme joint range
33
lateral collateral ligament
3 separate bands referred to as separate ligaments
34
3 bands of the lateral collateral ligament
anterior talofibular posterior talofibular calcaneofibular
35
what ligament is more prone to injury
lateral collateral ligament weaker
36
function of lateral collateral ligament
to control lateral distraction (varus) stresses on the ankle joint help check motion at extreme joint ranges
37
function of talocrural joint
motions of dorsiflexion and plantarflexion predominate do not occur purely in the sagittal plane
38
how do DF/PF occur not in one plane
single motion that crosses 3 planes triplanar motion d/t oblique axis of motion and shape of the body of the talus
39
axis
passes through the fibular malleolus, the body of the talus and through or just below the tibial malleolus
40
how is the axis oblique
lateral malleolus is more distal than the tibial and lies more posterior axis is considered to be rotated laterally 20-30 degrees in the transverse plane and inclined 10 degrees down the lateral side
41
d/y obliquity of the axis
DF --> ABD and eversion PF --> ADD and inversion
42
PF/DF
occur in the sagittal plane around a frontal axis
43
EV/INV
occur in the frontal plane around an A-P axis
44
ABD/ADD
occur in the transverse plane around a vertical axis
45
OKC dorsiflexion arthro
convex talus moving on a concave mortise BM & roll --> anterior glide --> posterior
46
OCK PF arthro
convex talus moving on a concave mortise BM & roll --> posterior glide --> anterior
47
CKC arthro
tibia and fib moving on a stationary talus
48
what will the lateral malleolus do
will move a greater distance on the larger lateral facet of the talus
49
CKC arthro --> in WB
when the tibia and fibula move over the fixed talus into dorsiflexion --> movement on the medial side stops while the lateral side continues to move anteriorly this causes medial rotation of the leg as it passes over the foot in WB dorsiflexion and lateral rotation of the leg in plantarflexion
50
ROM DF
20 degrees from neutral
51
neutral
when the foot is @ a right angle to the tibia
52
dorsiflexion is limited w/
knee extension passive insufficiency of the gastroc
53
plantarflexion ROM
30-50 degrees from neutral

kines final (11 decks)

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