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The Ankle and Foot Joints. Anatomy and Kinesiology 420:024. The Ankle and Foot Joints. Must support entire body weight Over 100 ligaments Propulsion of entire body weight (F=ma) Very complex 26 bones ~25 joints 31 muscles 12 extrinsic muscles 19 intrinsic muscles. Objectives.

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The Ankle and Foot Joints


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the ankle and foot joints

The Ankle and Foot Joints

Anatomy and Kinesiology

420:024

the ankle and foot joints1
The Ankle and Foot Joints
  • Must support entire body weight
    • Over 100 ligaments
  • Propulsion of entire body weight (F=ma)
  • Very complex
    • 26 bones
    • ~25 joints
    • 31 muscles
      • 12 extrinsic muscles
      • 19 intrinsic muscles
objectives
Objectives
  • Bones, bony landmarks and joints
  • Muscles
  • Movements
slide4

Bones

  • 29 bones, including tibia and fibula
    • Calcaneus and talus
    • Tarsals (5)
    • Metatarsals (5)
      • Numbered 1-5
    • Phalanges (14)
      • Three for each toe
      • Two for the big toe
  • Big toes have sesamoid bones in metatarsophalangeal joint tendons
ankle and foot joints
Talocrural joint (ankle)

Uniaxial hinge

Subtalar joint

Gliding/nonaxial

Transverse tarsal joints

Gliding/nonaxial

Intertarsal joints

Gliding/nonaxial

Tarsometatarsal joints

Gliding/nonaxial

Metatarsophalangeal joints

Biaxial ball and socket

Proximal interphalangeal joints

Little toes – Uniaxial hinge

Distal interphalangeal joints

Little toes – Uniaxial hinge

Interphalangeal joint

Big toe – Uniaxial hinge

Ankle and Foot Joints
slide7

Talocrural joint

Plantar/dorsiflexion

Sagittal, ML axis

Subtalar joint

Eversion/inversion

Frontal plane AP axis

objectives1
Objectives
  • Bones, bony landmarks and joints
  • Muscles
  • Movements
ankle and foot muscles
Ankle and Foot Muscles
  • Extrinsic muscles (12)
    • Multiarticular (6)
      • Knee/ankle (2)
      • Ankle/toe (4)
    • Uniarticular (6)
      • Ankle (6)
  • Intrinsic muscles (19)
extrinsic ankle and foot 12
Extrinsic Ankle and Foot (12)
  • Knee and Ankle (2)
    • Knee flexion, plantarflexion
  • Ankle and Toe (4)
    • Plantarflexion, toe flexion, inversion (2)
      • Little toes
      • Big toe
    • Dorsiflexion, toe extension (2)
      • Little toes, eversion
      • Big toe, inversion
  • Ankle (6)
    • Plantarflexion (4)
      • 2 invertors
      • 3 evertors
    • Dorsiflexion (2)
      • 1 invertor
      • 1 evertor
objectives2
Objectives
  • Bones, bony landmarks and joints
  • Muscles
  • Movements
movements
Plantarflexion (posterior compartment)

Dorsiflexion (anterior compartment)

Eversion (lateral compartment)

Inversion (posterior and anterior compartment)

Toe flexion (posterior compartment)

Toe extension (anterior compartment)

Abduction (intrinsic)

Adduction (intrinsic)

Movements
ankle plantar flexion
Ankle Plantar Flexion
  • Agonists
    • Gastrocnemius
    • Soleus
      • Flexor digitorum longus
      • Flexor hallucis longus
      • Peroneus (fibularis) longus
      • Peroneus (fibularis) brevis
      • Plantaris
      • Tibialis posterior
ankle dorsiflexion
Ankle Dorsiflexion
  • Agonists
    • Tibialis anterior
    • Extensor digitorum longus
    • Peroneus (fibularis) tertius
      • Extensor hallucis longus
transverse tarsal subtalar inversion
Transverse Tarsal & Subtalar Inversion
  • Agonists
    • Tibialis anterior
    • Tibialis posterior
      • Flexor digitorum longus
      • Flexor hallucis longus
transverse tarsal subtalar eversion
Transverse Tarsal & Subtalar Eversion
  • Agonists
    • Peroneus (fibularis) longus
    • Peroneus (fibularis) brevis
    • Peroneus (fibularis) tertius
    • Extensor digitorum longus
toe flexion
Toe Flexion
  • Agonists
    • Flexor hallucis longus
    • Flexor digitorum longus
toe extension
Toe Extension
  • Agonists
    • Extensor hallucis longus
    • Extensor digitorum longus