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The Ankle and Foot Joints Function of the Foot Bones

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The Ankle and Foot Joints Function of the Foot Bones 6/5/2017 The Ankle and Foot Joints Function of the foot • Provide a stable platform • Generate propulsion • Absorb shock Bones • Ankle + foot = 28 bones • foot = 26 bones • Leg: tibia, fibula • Foot: – Tarsals (7): talus, calcaneus, navicular, cuboid, and cuneiforms (3) – Metatarsals (5) – Phalanges (14) 1 6/5/2017 Joints • Tibiofibular: – articulation between tibia and fibula • amphiarthrodial joint • Ankle joint – Talocrural • articulation between talus and tibia; talus and fibula • classified as a ginglymus Joints • Subtalar joint – articulation between talus and calcaneus – classified as arthrodial (gliding) joint • Transverse tarsal joint – articulation between talus, navicular, calcaneus and cuboid bones – classified as arthrodial joint Joints • Tarsometatarsal – tarsal bones and metatarsal – classified as arthrodial (gliding) joints • Metatarsophalangeal – metatarsals and phalanges – classified as condyloid • Interphalangeal joints (proximal and distal) – phalangeal bones – ginglymus 2 6/5/2017 Arches of the foot • Medial longitudinal arch – calcaneus, talus, navicular, cuneiforms (3), and medial metatarsals (3). • Lateral longitudinal arch – calcanueus, cuboid, lateral metatarsals (4 & 5) • Transverse arch – across metatarsals Classifying Arch Type • Pes Planus: Flat foot • Pes Cavus: High Arch • Normal Movements • Ankle joint – dorsiflexion: “raising the toes” – plantarflexion: “point the toes” • Subtalar & Transverse tarsal joints – Calcaneal inversion and eversion • Interphalangeal joints – flexion – extension 3 6/5/2017 Movements • Supination • inversion • plantar flexion • adduction • Pronation •eversion • dorsiflexion • abduction Summary • Bones of the foot: – tarsals, metatarsals, phalanges • Joints of the foot and ankle – talocrural (ankle) – subtalar – transverse tarsal – metatarsalphalangeal – interphalangeal • Movements – dorsiflexion/plantarflexion (ankle joint) – inversion/eversion (subtalar & transverse tarsal) – flexion and extension of toes about the interphalangeal joints Muscles • Plantar flexors • Dorsi flexors • Evertors • Invertors 4 6/5/2017 Plantar Flexors • Gastrocnemius • Flexor digitorum longus • Peroneus longus • Plantaris • Soleus • Tibialis Posterior Dorsiflexors • Tibialis anterior • Peroneus tertius • Extensor digitorum longus Invertors • Tibialis anterior • Tibialis posterior • Flexor hallucis longus 5 6/5/2017 Evertors • Peroneus longus • Peroneus brevis • Peroneus tertius • Extensor digitorum longus Extensor digitorum longus (p44) • Origin – lateral condyle of tibia – upper 3/4 of anterior aspect of fibula • Insertion – superior aspect of foot, middle and distal phalanges of four lesser toes • Action – Extension of four lesser toes – dorsal flexion – eversion Extensor hallucis longus (p45) • Origin – fibula, middle aspect of anterior fibula • Insertion – superior aspect of foot, base of distal phalanx of great toe • Action – dorsiflexion – extension of great toe 6 6/5/2017 Peroneus tertius (p46) • Origin – fibula, anterior-lateral surface of lower 1/3 of fibula • Insertion – superior aspect of foot, base of fifth metatarsal • Action – Eversion – Dorsal flexion Tibialis anterior (p47) • Origin – Lateral condyle of tibia – Upper two-thirds of anterior-lateral aspect of tibia • Insertion – plantar surface of 1st (medial) cuneiform and 1st metatarsal • Action – Dorsal flexion – inversion Peroneus brevis (p48) • Origin – fibula, lower two-thirds, lateral aspect • Insertion – 5th metatarsal tuberosity • Action – eversion 7 6/5/2017 Peroneus longus (p49) • Origin – lateral surface of tibia – fibula, upper two-thirds of lateral aspect of fibula • Insertion – inferior aspect of foot, 1st cuneiform and 1st metatarsal bones • Action – Eversion – Plantar flexion Flexor digitorum longus (p50) • Origin – tibia, middle third, posterior aspect • Insertion – plantar surface of foot, distal phalanx of each of the four lesser toes (no big toe) • Action – ‘toe’ flexion – plantar flexion Flexor hallucis longus (p51) • Origin – fibula, lower two-thirds, posterior aspect • Insertion – plantar aspect of foot, base of distal phalanx of big toe (‘hallucis’) • Action – ‘big toe flexion’ – inversion 8 6/5/2017 Gastrocnemius (p52) • Origin – medial and lateral epicondyle of the femur • Insertion – posterior surface of calcaneus • Action – plantar flexion – knee flexion Soleus (p54) • Origin – upper 1/3 posterior shaft of fibula – posterior surface of head of fibula – popliteal line – middle 1/3 of medial border of tibia • Insertion – Posterior surface of the calcaneus • Action – Plantar flexion Note • Gastrocnemius and Soleus muscles have a common tendon/insertion (calcaneal tendon or Achilles tendon) • Some texts refer to the combination of the gastrocnemius and soleus as the triceps surae (three headed muscle). 9 6/5/2017 Plantaris (p53) • Origin – posterior surface of lateral epicondyle of femur • Insertion – posterior surface of calcaneus • Action – plantar flexion Tibialis Posterior (p55) • Origin – middle 1/3 of posterior-lateral surface of tibia – middle 1/3 of posterior-medial surface of fibula • Insertion – plantar surface of foot, lower inner surfaces of navicular, cuneiforms, and 2nd & 3rd metatarsals • Action – plantar flexion – inversion Summary of muscles • Plantar flexors – gast., sol., flx digitorum long., per longus, tib post, plantaris • Dorsi flexors – tib ant, per tertius, ext dig long • Evertors – per longus, brevis, tertius, ext dig longus • Invertors – tib ant & post, flx hallucis long 10.
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