Biomechanics OINA 1 Flashcards by Sara Daskal

Peroneus Brevis

insertion

Lateral aspect of the tuberosity at the base of the 5th metatarsal

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Perineum Brevis

origin

Distal 2/3 of the lateral shaft of the fibula

Adjacent inter muscular septum

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Peroneus Brevis

innervation

Superficial fibular n

L4-S1 (S1)

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Peroneus Brevis

Action

Eversion

Assists plantar flexion

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Peroneus longus

Origin

Head and proximal 2/3 lateral shaft of fibula

Often also lateral tibial condyl and tub/fib capsule

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Peroneus Longus

Insertion

Medial aspect of plantar surface of 1st metatarsal and 1st cuneiform

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Peroneus Longus

Innervation

Superficial fibular n

L4-S1) (S1

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Peroneus Longus

Action

Plantar flexion

Eversion of foot

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Peroneus Tertius

Origin

Distal 1/3 anterior fibula and adjacent interosseous membrane

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Peroneus Tertius

insertion

Dorsal shaft/base 5th metatarsal

Tendon emerges below inferior extensor retinaculum lateral to ext. digitorum tendon then diverts laterally on dorsolateral foot

Sometimes absent

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Peroneus Tertius

Innervation

Deep fibular/peroneal n

L4-S1 mainly S1

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Peroneus Tertius

Action

Assist dorsiflexion

Eversion

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Tibialis Anterior

Origin

Lateral condyle and anterolateral proximal 2/3 shaft of tibia

Adj interosseous membrane

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Tibialis anterior

Insertion

Medial 1st cuneiform

Adjacent 1st metatarsal base

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Tibialis anterior

Innervation

Deep peroneal/fib nerve

L4-L5

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Tibialis anterior

Action

Dorsiflex and invert/supinate the foot

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Tub ant

Kinesiologic function

Support medial longitudinal arch (eccentric)

Control pronation

Peak contraction is contact period

Etc etc

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Extensor digitorum Longus

Origin

Lateral tibial condyle

Proximal tibia fibular joint capsule

Proximal 2/3 of anteromedial fibular shaft

Adjacent interosseous membrane

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Extensor digitorum Longus

Insertion

Extensor good on Dotson of each toe. –> insert on middle phalanges of toes 2-5

(E.D.B. Joins E.D.L. In toes 2-4)

Extensor digitorum Longus

Innervation

Deep peroneal/fibular nerve

L4-S1

Extensor digitorum Longus

Action

Extend two joints 2-5

Assists dorsiflexion and eversion

Ext dig long

Key Kinesiological function

Most important during swing phase

Prevent toe drag

Extensor hallucis Longus

Origin

Middle anterior shaft of fibula

Adjacent interosseous membrane

(M. Belly deep to EDL and tub ant— not palpable except tendon on any ankle and dorsal foot)

Extensor hallucis Longus

Insertion

Distal phalanx of the hallux

Extensor hallucis Longus Innervation

Deep peroneal n L4-S1 (Strength considered indicator of L5)

Ext. hallucis Longus Action

Extend/dorsiflex big toe (with help of Brevis)

Tibialis posterior Origin (Member of deep posterior compartment)

Posterior lateral shaft of tibia Proximal medial shaft of fibUla Intervening interosseous membrane

Tib post Insertion

Like EDL, it has 8 insertions Navicular and 1st cuneiform Expansions to 2-3rd cuneiforms 2-4 metatarsal bases Cuboid Palpable posterior to medial malleolus

Tib post Innervation

Tibial n L4-S1

Tib post Action

Inversion foot Addiction foot Plantar flex ankle

Tib post Key kin function

Support (suspensor & tie beam) medial longitudinal arch Important to weight bearing on forefoot during take off Locks subtalar jnt as heel rises and eccentric control of pronation at takeoff

Gastroc. Origin

Posterior femur Medial head---> superior medial condyle Lateral head---> superior lateral condyle

Gastroc Insertion

Tuberosity on post calcaneus (Superior part separated from tendon by retrocalcaneal bursa

Gastroc Innervation

Tib n. L5-S2 (L5-S1)

Gastroc Action

Plantar flexion Assist hammie's and popliteus in flexing knee Especially during terminal extension in closed kinetic chain (=paradoxical knee extension)

Gastroc Key Kinesiological function

Meh too lazy

Soleus Origin

Posterior head, neck and proximal 1/3 shaft fibula Posteriormedial shaft along popliteal/soleal line Posterior to proximal end of medial crest of tibia

Soleus Insertion

Achilles tendon Middle part of calcaneal tuberosity

Soleus Innervation

Tib n. L5-S2

Soleus Action

Plantr flex foot

Soleus Key kines. Function

Meh too lazy again. :/

Popliteus (Most proximal member of deep posterior comp. of knee) Origin

Lateral aspect of the lateral femoral condyle Adjacent arcuate ligament and posterior capsule Popliteofibular ligament forms along it's anterolateral margin

Popliteus Insertion

Goes obliquely inferomedially to insert on posterior aspect of the proximal tibia above the popliteal/soleal line Attaches to the lateral meniscus as it crosses lateral to medial also

Popliteus Innervation

Tibial nerve L4-S1

Popliteus Action

Internally rotates tibia in an open kinetic chain and externally rotates the femur when tibia is fixed (closed kinetic chain) Assists knee flexion Knee stabilizer

Popliteus Key Kinesiological function

Unlocks externally rotated tibia at initiation of flexion from fully extended Most important stabilizer of lateral knee at extremes of external tibial rotation through its action and tensing popliteofib ligament Stabilize fib when squatting.... Etc etc etc