Ankle Joint Flashcards
Is the tibia or the fibula weight bearing?
The tibia transfers weight from the the knee to, it is the only bone which articulates with the knee hence it is weigh bearing.
If it is not weight bearing what is the role of the fibula?
Fibula is mainly for muscle attachment
How and where tibia more susceptible to injury?
Although they are connected and generally broken together –> Because long ring bone
Tibia felt as the shin, sits very medially and anteriorly can be felt subcutaenously close to teh skin. the most susceptible region is at the junction of the superior 2/3 and the inferior 1/3, this is where the tibia is the narrowest and has the poorest blood supply ( where anterior tibia artery from above anastamose with fibular arteries from below)
If single fracture it is generally the fibula
What the interosseus membrane
Deep fascia, in between the tibia and fibula, can serve as a location for muscle attachement
Describe the superior Tibiofemoral Joint
It is a synovial joint
- re infroced by ligaments anteriorly & posteirorly
Describe the inferior tibiofemoral Joint? Common MOde of injury?
Fibrous Joint - Syndesmosis
- reinforced by ant posterior, and interosseus ligaments
- Involved in shock absorption
Diastasis: Common mode of injury when individual falls form a great hight causing tears of the syndesmosis
What is the stability of the tibiofemoral joint?
Both superior and inferior are quite stable , therefore sublaxation and dislocation is quite rare
What is the calcaenus?
It is the heal bone, bears weight onto the ground thus the strongest of all of the tarsal bones. Vertically orientated
What is the talus? What does it it articulate with?
The tallus articulates with tibia to form the ankle joint. it sits in teh socket formed by the medial and lateral malleolus. Vertically orientated
What is so special about the lateral metatarsal
• 2nd metatarsal = THIN + LOCKED IN PLACE (by cuneiforms) + SUSCEPTIBLE TO WEIGHT BEARING SHOCK March fracture
How are nerves and vessels which pass throught he foot protected from compression?
There are two sesamoid bones under the head of the first metatarsal which create a tunnerl
Between which two malleloi does the tallus sit? Which mallelous extends further?
Sits between the medial and lateral malleolus, the lateral malleoli extends more distally than the medial. The plane of movement is not horizontal. The socket which it fits into is called the
Mortice
What is the inferior transverse ligameent? What is its function?
A transverse ligament which runs behind the malleoli. it takes origin from the lateral mallelous and goes almost o the medial mallelolar procss
It functions to deepend the motice
What is the axis of movement at the ankle?
It is oblique, as the lateral mallelous projects further.
o Plantar flexion (pointing down) = projects more medially
o Dorsi flexion (pointing up) = projects more laterally
Describe the medial collateral ligament of the ankle joint?
Extends from the medial malleloous to the bone, it is thicker than lateral. Along with three other ligaments forms a tight traingular band mass
