Gross Anatomy-Leg

Question 1

Describe the Tibiofibular Joints

Answer 1

• 2 tibiofibular joints:

• Superior tibiofibular joint
• Inferior tibiofibular joint (tibiofibular syndesmosis)
• Also held together by interosseous membrane
• Fibers of all 3 run inferiorly from tibia to fibula
• Resist downward pull placed on fibula by 8 mm.
• Allows slight upward movement of fibula
• Movement at superior joint impossible without movement at inferior joint
• Anterior tibial vessels pass through hiatus at superior end of interosseous membrane
• Smaller hiatus at inferior end for perforating vessels from fibular a.

Question 2

What kind of joint is the **Superior Tibiofibular Joint **

Answer 2

• Synovial joint

Question 3

What are the Features of the *Superior Tibioffibular Joint *

Answer 3

Features:

• Plane type joint

• Permits slight upward movement during dorsiflexion
• Between flat facet of fibular head and similar articular facet posterolaterally on lateral tibial condyle
• Tense joint capsule present
• Joint is crossed posteriorly by t. of popliteus
• 20% of time popliteus bursa communicates with synovial cavity of joint
• Important for transmission of inflammation between two joints

Question 4

What are the Ligaments of the Supirior Tibiofibular Joint

Answer 4

• Ligaments*
• *• Anterior and posterior ll. of fibular head –**
• Pass superomedially from fibular head to lateral tibial condyle
• Strengthen anterior and posterior aspects of joint

Question 5

Describe the Inferior Tibiofibular Joint

(Tibiofibular Syndesmosis)

Answer 5

• Compound fibrous joint
• Integrity of joint is essential for stability of ankle
• Keeps lateral malleolus firmly against lateral surface of talus

Question 6

What are the Features of the Inferiors Tibiofibular Joint (Tibiofibular Syndesmosis)

Answer 6

Features
• Between triangular articular area on medial surface of fibula with facet on end of tibia
• Fibrous union of tibia and fibular by:

• Interosseous membrane
• Anterior tibiofibular l.
• Posterior tibiofibular l.

• Permits slight movement to accommodate wedging of wide portion of trochlea during dorsiflexion

Question 7

What are the Ligaments of the Inferior Tibiofibular Joint (Tibiofibular Syndesmosis)

Answer 7

Ligaments

• Interosseous tibiofibular l. –

• Continuous superiorly with interosseous membrane
• Principal connection between tibia and fibula

• Anterior tibiofibular l. –

• Strengthens joint anteriorly

• Posterior tibiofibular l. –

• Strengthens joint posteriorly

• Inferior transverse (tibiofibular) l. –

• Deep, distal continuation of posterior tibiofibular l.
• Forms strong connection between malleoli
  
  • • Contacts talus
  • • Forms posterior “wall” of square socket
    
    • Malleolar mortise for talus
    • 3 walls, open anteriorly
    • Lateral and medial walls formed by respective malleoli

Question 8

YOUR DOING GREAT

Answer 8

YES

YES

YES

YOU

ARE =}