Biomechanics of the Ankle and Foot Flashcards
Biomechanics
Most movements of the ankle move about what kind of axis?
Ankle and Foot
Oblique
Pronation: Dorsiflexion, Eversion, Forefoot Abduction
Supination: Supination, Inversion, and Forefoot Adduction
Biomechanics
The proximal portion of the talocrural joint is comprised of which bone(s)? This portion of the joint is (Convex or Concave).
Ankle and Foot
- Lateral and Medial Malleoli
- Concave
Biomechanics
What are the arthrokinematics for open-chain and closed-chain talocrural dorsiflexion?
Ankle and Foot
Open-chain: anterior roll and posterior glide
Closed-chain: anterior roll and anterior glide
Biomechanics
Approximately ____% of compressive forces pass through the talus and tibia; the remaining ____% pass through the talus and fibula
Ankle and Foot
- 90
- 10
Biomechanics
How does the tibia move with subtalar pronation and supination?
Ankle and Foot
Pronation: Internal rotation of tibia
Supination: External rotation of tibia
Biomechanics
What is rear-foot valgus (calcaneovalgus) and rear-foot varus (calcaneovarus)?
Ankle and Foot
Rear-foot Valgus: the calcaneus angles away from midline
Rear-foot Varus: the calcaneus angles toward midline
Biomechanics
What is forefoot valgus and forefoot varus?
Ankle and Foot
Forefoot Valgus: the excessive eversion of forefoot
Forefoot Varus: the excessive inversion of forefoot
Biomechanics
How does the arch of the foot move during the gait cycle?
Ankle and Foot
During most of the stance phase the arch lowers slightly. By late stance, the arch rises as the subtalar joint supinates.
Biomechanics
How does the windlass mechanism work and what happens if it is not working properly?
Ankle and Foot
As the toes extend, the plantar fascia becomes taut and adds stability to medial longitudinal arch.
Unstable midfoot and a loss of plantarflexion strength in weightbearing.
