Ankle: Anatomy 2 Flashcards
The TCJ is this type of joint
uniaxial synovial hinge joint
TCJ: articulation occurs between
- convex trochlea of talus
- concave distal tibia and fibula (mortise)
Talus is wider by 0.1 inch in which direction?
- anterior
- lateral
The distal (tibia/fibula) extends more distally
fibula
The distal fibula extends more distally and (anteriorly/posteriorly)
posteriorly
The distal fibula extends more distally and posteriorly increasing stability in (direction) and decreases (medial/lateral) ankle sprains
- eversion
- medial
TCJ: supplied by which nerves?
branches of tibial and deep peroneal nerves
TCJ: runs from where to where?
tip of lateral malleolus to tip of medial malleolus
TCJ: lateral inclination
inclined 10˚ down laterally
TCJ: transverse plane
20-30˚ lateral from transverse plane
TCJ kinematics: how many degrees of freedom?
1 primarily
TCJ kinematics: With DF, talus glides (anteriorly/posteriorly)
posteriorly
TCJ kinematics: With DF, talus glides posterior and wedges between both malleoli allowing little to motion into
inv/ev
TCJ kinematics: since the joint axis is not solely in the sagittal plane, it is referred to as
triplanar
TCJ kinematics: since the joint axis is not solely in the sagittal plane, it is referred to as triplanar and the motion is
pronation and supination
pronation motions
- DF 20˚
- abduction
- eversion
supination motions
- PF 50˚
- adduction
- inversion
Walking requires how much PF?
20˚
Walking requires how much DF?
10˚
Ankle DF arthrokinematics: foot free
convex trochlea of the talus rolls (anteriorly/posteriorly) and glides (anteriorly/posteriorly) on the concave tibia/fibula
- rolls anteriorly
- glides posteriorly
Ankle DF arthrokinematics: foot fixed
concave tibia/fibula rolls and glides (anteriorly/posteriorly) on the convex talus
anteriorly
shape of sinus tarsi
conical
The sinus tarsi is a conical shaped cavity located between what structures?
- anterosuperior surface of calcaneus
- inferior aspect of the neck of the talus
The sinus tarsi terminates posteromedial directly behind this structure
sustentaculum tali