Talocrural joint biomechanics

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15 Terms

1
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Supination closed chain

Tibial ER

Calcaneal INV

Talar ABD

Talar DF

Supination occurs at subtalar joint

<p>Tibial ER</p><p>Calcaneal INV</p><p>Talar ABD</p><p>Talar DF</p><p>Supination occurs at subtalar joint</p>
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Pronation closed chain

Tibial IR

Talar PF and ADD

Calcaneal EV

<p>Tibial IR</p><p>Talar PF and ADD</p><p>Calcaneal EV</p>
3
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Foot general function

Stability: rigid lever

Mobility: absorbs shock, conforms to terrain

28 bones

25 joints

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Forefoot

Metatarsals and phalanges

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Midfoot

Navicular, cuboid, and cuneiform

<p>Navicular, cuboid, and cuneiform</p>
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Hind/rearfoot

Talus and calcaneus

<p>Talus and calcaneus</p>
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Talocrural joint

Sagittal plane, DF and PF

DF = 20 degrees

PF = 5O degrees

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inversion/eversion

Occur at hindfoot

frontal planeAP axis

Plantar surface either moves towards midline or away from midline

<p>Occur at hindfoot</p><p>frontal planeAP axis</p><p>Plantar surface either moves towards midline or away from midline</p>
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Calcaneal aDD/ABD

Transverse plane,

Vertical axis

Adduction: distal segment towards midline of body

Abduction: distal segment away from midline of body

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Supination and Pronation open chain

Supination: PF, IN, ADD

Pronation: DF, EV, ABD

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Tibiofibular joint

immovable synarthrosis

pertaining to joint between tibia and fibula

Proximal (fibular head and articulating facet of tibia by knee)

Middle: interosseus

Distal: cannot palpae

Saynovial joints

Motions: superior and inferior fibular gliding, fibular rotation

Interosseous membrane: supports proximal and distal joints, can have chronic irritation (shin plints)

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distal tibiofibular joint

Fibrous - syndesmosis

stability

distal fibula and fibular notch of tibia

Stabilizes mortise

<p>Fibrous - syndesmosis</p><p>stability</p><p>distal fibula and fibular notch of tibia</p><p>Stabilizes mortise</p>
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Talocrural joint

hinge, synovial,distal tibia, fibular form mortise for trochlea of talus (tenon which inserts into mortise), primary motions are dorsiflexion and plantarflexion, made of roof of tibia, and medial and lateral malleoli

1. Doesn't have good blood supple

2. No muscular attachments

3. Risk for delayed or non-union fracture

4. the most congruent joint in the body

5. Talus is wider anteriorly

<p>hinge, synovial,distal tibia, fibular form mortise for trochlea of talus (tenon which inserts into mortise), primary motions are dorsiflexion and plantarflexion, made of roof of tibia, and medial and lateral malleoli</p><p>1. Doesn't have good blood supple</p><p>2. No muscular attachments</p><p>3. Risk for delayed or non-union fracture</p><p>4. the most congruent joint in the body</p><p>5. Talus is wider anteriorly</p>
14
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Talocrural joint motion

1. Single axis

2. Not in true AP plane

3. uniaxial but oblique hinge joint

4. Talocrural coupling - axis shifts slightly with motion "lower leg rotation initiates movement of the talus which causes simultaneous motion in all 3 joints"

5. Closed pack in DF. Ligaments and capsule are taught

6. PF: open pack, loose - where you want to do mobs

<p>1. Single axis</p><p>2. Not in true AP plane</p><p>3. uniaxial but oblique hinge joint</p><p>4. Talocrural coupling - axis shifts slightly with motion "lower leg rotation initiates movement of the talus which causes simultaneous motion in all 3 joints"</p><p>5. Closed pack in DF. Ligaments and capsule are taught</p><p>6. PF: open pack, loose - where you want to do mobs</p>
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Talocrural joint capsular pattern

PF < DF