structure & function of the ankle and foot - mcccbehrensb/documents/week12b-final.pdf ·...
TRANSCRIPT
Structure & Function
of the Ankle and Foot
A complicated model of simplicity that you really think little about
until you have a problem with one.
The Foot and Ankle
The foot and ankle must be
able to instantly adapt to the
surface that you are walking
on so that you can get, “from
point A to point B.”
Acts as shock absorber
as heel hits the ground
Adapts to level and
unlevel surfaces
Provides stable base of
support
The Foot and Ankle
Terminology
-Plantar flexion
-Dorsi flexion
-Inversion
-Eversion
--Supination:
plantarflexion & inversion
--Pronation:
dorsiflexion & eversion
Joints at the foot and ankle
• Talocrural (tibiotalar): Talus and tib/fib
–Allows dorsi and plantarflexion
• Subtalar: Talus and calcaneus
–Allows inversion and eversion
• Transverse tarsal: Talonavicular and Calcaneocuboid joints
–Allows bi-planar motions
–Supination/Pronation
• Metatarsophalangeal: Metatarsal heads and proximal phalanges
–Flex/ext and abd/add
• Interphalangeal: toes 2-5 have PIP and DIP; 1st toe only has an IP (just like thumb)
–Flex/ext only
Ligaments of ankle/foot
• Lateral Collateral ligaments
–Located on the lateral ankle
–Resists inversion
•Anterior Talofibular**
• Posterior Talofibular
•Calcaneofibular
• Deltoid ligament
–Located on medial ankle
–Resists eversion
•Tibionavicular
•Tibiocalcaneal
•Tibiotalar
• Anterior/Posterior Tibiofibular ligaments
–Binds distal tib-fib joint (stability)
• Superior to other ligaments (high-ankle sprain)