LL: Leg Flashcards
Attachments for meniscus and cruciate ligaments on tibia
Anterior horn of medial meniscus attaches most anteriorly
PCL attaches most posteriorly
Attachment of collateral ligaments
Tibial collateral: medial condyle of femur to medial tibia
Fibular collateral: lateral condyle of femur to fibular head
Which structure separates the PCL from popliteal artery
oblique popliteal tendon

Lower femur bony anatomy

Proximal tibia bony anatomy

Proximal fibula bony anatomy

Popliteal fossa content
From superficial to deep
Common peroneal nerve (medial to biceps femoris)
Tibial nerve (lateral to popliteal vessels)
Popliteal vein
Popliteal artery

The membranes separatign the compartments of the leg

Which tissues stabilise tibiofibular joint
Interosseous membrane
Anterior and posterior tibiofibular ligaments

Muscles of posterior compartment of leg
Superficial: gastrocnemius, plantaris, soleus
Deep: popliteus, flexor hallucis longus, flexor digitorum longus, tibilais posterior
Origin and insertion of gastrocnemius
Medial and lateral condyle to calcaneus

Origin and insertion of plantaris
Lateral supracondylar line of femur to calcaneus

Origin and insertion of soleus
Soleal line/medial tibia to calcaneus

Innervation to posterior compartment of leg
tibial nerve
Function of gastrocnemius and plantaris
Plantar flex
Flex knee
Function of soleus
Plantar flex
Origin and insertion of popliteus
Lateral femoral condyle to posterior tibia

Origin and insertion of flexor hallucic longus
posterior fibula to distal phalanx f big toe

Origin and insertion of flexor digitorum longus
Tibia to distal phalanges of lateral 4 toes

Origin and insertion of tibialis posterior
Interosseus membrane to tuberosity of navicular bone

Function of popliteus
Stabilises knee joint (resists lateral flexion of tibia on femur)
Unlocks knee joint (laterally rotates femur on fixed tibia)

Action of flexor hallucis longus
Flexes great toe
Action of flexor digitorum longus
Flexes lateral four toes
Action of tibialis posterior
Inversion
Plantarflexion
Arterial supply of Leg
Sural: gastrocnemius
Anterior tibial: anterior compartment
Posteriro tibial: Posterior and lateral compartment

Tibial nerve branches
Sural nerve
Medial calcaneal nerve

Sural nerve supplies
Lower posterolateral side of leg and little toe

Medial calcaneal nerve supplies
Medial side of leg
Sole of the heel
Muscles of lateral compartment of the leg
Fibularis longus
Fibularis brevis

Origin and insertion of fibularis longus
Fibular head to medial cuneiform and base of metatarsal 1

Origin and insertion of fibularis brevis
Lower 2/3 of fibular shaft to lateral tubercle of metatarsal 5
Action of fibularis longus and brevis
Eversion
Innervation of lateral compartment of leg
superficial fibular nerve
Superficial fibular nerve sensory innervation
Dorsum of foot except:
- web space between great and 2nd toe (Deep fibular)
- lateral side of little toe (sural branch of tibial nerve)

Muscles of anterior compartment of leg
Tibialis anterior
Extensor hallucis longus
Extensor digitorum longus
Fibularis tertius

Origin and insertion of tibialis anterior
Tibia to medial cuneiform

Origin and insertion of Extensor hallucis longus
medial fibula to distal phalanx of distal toe
Origin and insertion of extensor digitorum longus
medial fibula to distal phalanges bases

Innervation of anterior compartment of leg
Deep fibular nerve
Action of tibialis anterior
dorsiflexion
inversion
Action of extensor hallucis longus/digitorum longus
dorsiflexion
Extension of great/lateral toes
Action of fibularis tertius
Dorsiflexion
Eversion
Arterial supply of anterior compartment of leg

Action of anterior cruciate ligament
stops anterior displacement of tibia on femur

Unhappy triad of knee injuries
MCL, ACL and medial meniscus
results from lateral blow
Cruciate ligaments of the knee attachments
ACL: medial wall of alteral condyle to anterior to intercondylar eminance of tibia
PCL: lateral edge of medial femoral condyle to posterior tibia
At what point does popliteal artery bifurcate into anterior tibial and tibioperoneal trunk
Iower border of popliteal muscle
What is Baker’s cyst
A synovial cyst (abnormal collection of synovial fluid) exctruding from semimembranous bursa to popliteal space
(not a true cyst as normally has communication with synovial space)