Talocrural articulation

Question 1

Talocrural joint

Answer 1

• Joint of facies articularis inferior tibiae, facies articularis malleoli tibiae and facies articularis malleolis fibulae with trochlea tali
• Forms a bifurcation

Question 2

Joint capsule of the talocrural joint

Answer 2

• Is attached to the margins of the joint surfaces
• Anteriorly and posteriorly it is free
• laterally it is reinforced by strong ligaments: ligamentum collaterale medialis (deltoideum) and ligamentum collaterale laterale

Question 3

Medial collateral (deltoid) ligament of the ankle

Answer 3

• Runs from the medial maleolus of the tibia and in a fan shaped way diverges to:

1. os naviculare - pars tibionavicularis
2. talus - pars tibiotalaris anterior
3. sustenaculum tali of calcaneus - pars tibiocalcanea
4. dorsal part of talus - pars tibiotalaris posterior

Question 4

Lateral collateral ligament of the ankle

Answer 4

• Represents three individually running ligaments:

1. Anterior talofibular ligament - from the lateral maleolus to collum tali
2. Calcaneofibular ligament - stretched between maleolus lateralis of the fibula and the lateral plane of the calcaneus (close to trochlea peronealis)
3. Posterior talofibular ligament - connects fossa malleoli lateralis of fibula and processus posterior tali

Question 5

Movement and type - ankle joint

Answer 5

• Trochlear joint
• Enables plantar and dorsal flexion of the foot
• Trochlea tali is narrower proximally and so the foot is fixed whilst in a normal position on plant pedis
• During plantar flexion the narrow part of trochlea tali gets into the bifurcation of the crural bones and the joint is relaxed - this is the reason why standing on tip-toes allows only wobbly movements