The Ankle

Question 1

What maintains the Anterior stability of the Ankle?

Answer 1

Bone: Wide margin of the Talus
Static: Weak Joint Capsules
Dynamic: Anterior Compartment muscles & peroneus tertius

Question 2

What maintains the Lateral Stability of the Ankle?

Answer 2

Bone: Lateral Maleolus
Static: ATFL, calcanealfibular lig and ft capsule (weak)
Dynamic: Peroneus brevis, proneus longue (very weak)

** This is why 80-85% of ankles sprains are on the lateral side ***

Question 3

What maintains the Posterior Stability of the Ankle?

Answer 3

Bone: Nothing
Status: Weak posterior capsule
Dynamic: Very Strong Triceps Surae

Question 4

What maintains the Medial Stability of the Ankle?

Answer 4

Bone: Medial Mallelus
Static: Deltoid lig.
Dynamic: Medial flexor group, tibialis anterior

** VERY strong stability - only 5% of sprains are on this side **

Question 5

What are the two types of Pes Planus?

Answer 5

Functional - developed w/ time

Structural - born with it

Question 6

Foot biomechanics of a heelplant

Answer 6

Subtalar jt is locked, foot is supinated, shock delivered up the calcaneus

Question 7

Foot biomechanics of midstance

Answer 7

subtalar jt. unlocks, foot pronates, shock is absorbed

Question 8

Foot biomechanics of toe off

Answer 8

subtalar jt locks again, foot supinates, provides rigid lever for propulsion