Calf and Ankle Flashcards
What are the groups of bones of the ankle/foot?
- Tarsals
- Metatarsals
- Phalanges
Name the tarsal bones
- talus
- calcaneus
- navicular
- cuboid
- medial/lateral/intermediate cuneiforms
What does the talus articulate with to form the ankle joint?
Tibia and fibula
what articulations form the intertarsal joints?
talus with calcaneus and navicular
name the features of the talus
- body
- neck
- head
what does the body of the talus articulate with?
- tibia
- M/L malleolus
what does the neck of the talus articulate with?
navicular bone
what are the features of the calcaneus?
- calcaneal tuberosity
- sustenticulum tali
name the joints at the lower leg/ankle?
- Tibiofibular
- proximal (superior)
- distal (inferior)
- Talocrural
proximal tibiofibular joint articulations
head of fibula and lateral epicondyle/plateau of tibia
What type of joint is the proximal tibiofibular joint?
planar synovial joint
Ligaments of the proximal tibiofibular joint
- strong joint capsule
- A/P ligaments of the fibular head
- Interosseous membrane
Movements of the proximal tibiofibular joint
generally doesn’t move
allows slight elevation during dorsiflexion to help with shock absorption
Distal tibiofibular joint articulations
medial surface of the distal end of fibula with fibular notch of tibia
Distal tibiofibular joint type
syndesmosis (amphiarthrosis)
Ligaments of the distal tibiofibular joint
- No joint capsule = not synovial joint
- interosseous tibiofibular ligament
- A/P tibiofibular ligaments
- interior transverse ligament
Articulations at the talocrural joint
- fibulotalar - lateral malleolus of fibula with lateral trochlea of talus
- tibiotalar - distal end of tibia and lateral edge of medial malleolus with superio and medial trochlea of talus
which articulation at the talocrual joint is the weight bearing connection between the tibia and talus?
Tibiotalar
Joint type of talocrural joint
hinge, synovial
Ligaments of the Talocrual joint
- interosseus ligament
- joint capsule
- collateral ligaments (M/L)
- Inferior transverse ligament
what are the collateral ligaments of the Talocrural joint?
- Lateral (fibular) collarteral ligament
- Medial (tibial) collateral (deltoid) ligament
Movements at the talocrural joint
Dorsiflexion/plantar flexion with a little wobble when plantar flexion
the body of the the talus is _______ anterior than posterior
wider
when the ankle is ____________ the _____________ part of the talus body is between the malleoli for a tighter more ________ fit
- dorsiflexed
- wider anterior
- stable
Tibialis anterior prox attachment
tibia/fibula/IO membrane
Tibialis anterior distal attachment
medial tarsals (medial cuneiform & navicular) and base of metatarsal 1
Tibialis anterior innervation
fibular nerve (L4, 5)
Tibialis anterior action
- at ankle - dorsiflex
- at intertarsal joints - inversion
Extensor digitorum longus prox attachment
tibial/fibula/IO membrane
Extensor digitorum longus distal attachment
extensor expansion digits 2-5
Extensor digitorum longus innervation
fibular nerve (L4, 5)
Extensor digitorum longus action
- at ankle - dorsiflex
- at digits - extension
what forms the extensor expansion on digits 2-5?
- extensor digitorum longus
- lumbricals
- plantar interossei
- dorsal interossei
Extensor hallucis longus prox attachment
tibia/fibula/IO membrane
Extensor hallucis longus distal attachment
extensor expansion of hallux (digit 1)