DEX IOT DAY ACTUAL EXAM COMPLETE QUESTIONS AND
CORRECT VERIFIED ANSWERS (DETAILED ANSWERS)|ALREADY
GRADED A+
syndesmosis joint
ANSWER IS - also known as tibiofiibular ligament,
located above the ankle joint, comprised of:
AITFL: anterior inferior talo-fibular ligament
PITFL: strongest ligament
Tibiofibular Interosseous ligament: membrane running vertically between fibula and tibia
talus anchor in atfl
ANSWER IS - 2cm from lateral talar process angled 40-45 degrees to the sagittal plane and parallel with
the longitudinal line of fibula, 4:30 for R, 7:30 for L
fibula anchor in atfl
ANSWER IS - 15mm from distal tip of fibula
tensioning atfl ib
ANSWER IS - neutral with 10-15 degrees plantar flexion
medial mal anchor for deltoid ib
ANSWER IS - medial mal in intercollicular grove w/ 4.75 anchor
talus anchor in deltoid ib
ANSWER IS - deep deltoid, 12.2mm/1cm in talus
sustentaculum tali anchor for deltoid ib
ANSWER IS - superficial deltoid, 8mm anterior
deltoid recon
ANSWER IS - superficial tibiocalcaneal & deep posterior tibiotalar
ANSWER IS - forced external rotation of the foot (specifically talus)
syndesmosis function
ANSWER IS - resists movement of:
coronal translation (side to side/left to right)
rotational
sagital translation (forward or backwards)
ideally syndesmosis resists diastesis but allows normal physiological micro-motion
Aitfl mechanism of injyry
, ESTUDY
ANSWER IS - external rotation -> force of the talus pushing on fibula causes tear/stress
when to use aitfl internal brace
ANSWER IS - Re-assess syndesmotic motion. mild rotational instability
Weber Classifications
ANSWER IS - based on level of fibula fracture compared to ankle/syndesmosis joint & better for
surgical decision making
Weber A
ANSWER IS - below ankle joint (infrasyndesmotic)
Avulsion type injury of distal fibula Foot supinated (inversion) with an adduction deforming force
Stress on atfl & cfl causes bone to break off (similar to medial mal) Usually doesn't involve syndesmotic
injury
medial mal is also often fractured
Weber B
ANSWER IS - at the ankle joint (transyndesmotic)
could include syndesmosis injury
most common
medial mal may be fractured or deltoid ligament may be torn
variable stability
foot inverted with external rotation
Weber C
ANSWER IS - above the ankle joint (suprasyndesmotic)
most likely a syndesmosis injury
distal tibiofibular articulation widened
foot in pronation (eversion), the medial structures are under tension and external rotation force is
applied
almost always syndesmosis
deltoid injury and/or medial mal fracture
Lauge hansen
ANSWER IS - describes position of foot at time of injury & deforming forces
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