Ankle and Foot Flashcards
What joint sustains the greatest load per surface area of any joint in the body?
the ankle joint
The ____ foot absorbs the majority of the load followed by what?
rear
metatarsal heads
What are the 5 functions of the foot?
- Acts as a support base that provides the necessary stability for upright posture with minimal muscle effort
- Provides a mechanism for rotation of the tibia and fibula during stance
- Provides flexibility to adapt to uneven terrain
- Provides flexibility for absorption of shock
- Acts as a lever during push-off
What are the 3 joints of the rearfoot?
- tibiofibular joint
- talocrural joint
- subtalar joint
What is the resting position of the tibiofibular joint?
plantarflexion
What is the closed-packed position of the tibiofibular joint?
maximum dorsiflexion
What is the capsular pattern for the tibiofibular joint?
there is pain on stress
What are the 3 supporting ligaments of the tibiofibular joint?
- Anterior tibiofibular ligament
- Posterior tibiofibular ligament
- Interosseous ligament
What is the talocrural joint designed for?
stability
What is the resting position of the talocrural joint?
10 degrees of plantarflexion
What is the closed-packed position of the talocrural joint?
maximum dorsiflexion
What is the capsular pattern for the talocrural joint?
plantarflexion > dorsiflexion
What are the 2 supporting ligaments of the talocrural joint?
- Deltoid ligament (Medial Collateral)
- Lateral Collateral
What 4 ligaments make up the deltoid ligament?
- Tibionavicular ligament
- Tibiocalcaneal ligament
- Posterior tibiotalar ligament
- Anterior tibiotalar ligament
What 3 ligaments make up the lateral collateral ligament?
- Anterior talofibular ligament
- Posterior talofibular ligament
- Cancaneofibular ligament
How many degrees of freedom does the subtalar joint have?
3
What is the resting position of the subtalar joint?
Midway between extremes of ROM
What is the closed-packed position of the subtalar joint?
supination
What is the capsular pattern for the subtalar joint?
Varus of the rearfoot > Valgus at Rearfoot
What are the 4 supporting ligaments of the subtalar joint?
- Lateral (anterior) talocalcaneal ligament
- Medial (posterior) talocalcaneal ligament
- Cervical ligament
- Interosseous ligament
What aspect of the subtalar joint is stable in open chain exercises?
the talus
What 3 movements result in supination in open chain exercises?
PF, Inversion, and Adduction
What 3 movements result in pronation in open chain exercises?
DF, Eversion, and Abduction
What aspect of the subtalar joint is stable in closed chain exercises?
the calcaneus
What 3 movements result in supination in closed chain exercises?
Talus Abduction, DF, and Cancaneal Inversion
What 3 movements result in pronation in closed chain exercises?
Talus Adduction, PF, and Cancaneal Eversion
What are the 5 joints of the midfoot?
- Transverse tarsal joint (aka Midtarsal)
- Cuneonavicular joint
- Cuboidenavicular joint
- Intercuneiform joints
- Cuneocuboid joint
What is the resting position of all joints of the midfoot?
midway between the extremes of ROM