Page 1 of 110
DEX IOT Exams | Grade A | Questions and Verified
Answers | 100% Correct (Latest 2025 Updates STUDY
BUNDLE WITH COMPLETE SOLUTIONS)
syndesmosis joint .....ANSWER.....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.....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.....15mm from distal tip of fibula
,Page 2 of 110
tensioning atfl ib .....ANSWER.....neutral with 10-15 degrees
plantar flexion
medial mal anchor for deltoid ib .....ANSWER.....medial mal in
intercollicular grove w/ 4.75 anchor
talus anchor in deltoid ib .....ANSWER.....deep deltoid,
12.2mm/1cm in talus
sustentaculum tali anchor for deltoid ib .....ANSWER.....superficial
deltoid, 8mm anterior
deltoid recon .....ANSWER.....superficial tibiocalcaneal & deep
posterior tibiotalar
superficial deltoid .....ANSWER.....4, resists eversion of hindfoot
deep deltoid .....ANSWER.....2, medial ankle sprain, lateral ankle
sprain, ankle fracture, flatfoot
,Page 3 of 110
mechanical instability .....ANSWER.....clinical and radiographic
evidence that demonstrates excess movement of the talus within
ankle mortise
functional instability .....ANSWER.....subjective complaint of
patient
sorain classifications .....ANSWER.....Grade 1: ATFL sprain
Grade 2: ATFL & CFL partial tear
Grade 3: ATFL, CFL, and possibly PTFL
sural & superficial peroneal .....ANSWER.....nerves to watch out
for with ATFL IB
syndesmosis mechanism of injury .....ANSWER.....forced external
rotation of the foot (specifically talus)
syndesmosis function .....ANSWER.....resists movement of:
coronal translation (side to side/left to right)
rotational
, Page 4 of 110
sagital translation (forward or backwards)
ideally syndesmosis resists diastesis but allows normal
physiological micro-motion
Aitfl mechanism of injyry .....ANSWER.....external rotation ->
force of the talus pushing on fibula causes tear/stress
when to use aitfl internal brace .....ANSWER.....Re-assess
syndesmotic motion. mild rotational instability
Weber Classifications .....ANSWER.....based on level of fibula
fracture compared to ankle/syndesmosis joint & better for
surgical decision making
Weber A .....ANSWER.....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
DEX IOT Exams | Grade A | Questions and Verified
Answers | 100% Correct (Latest 2025 Updates STUDY
BUNDLE WITH COMPLETE SOLUTIONS)
syndesmosis joint .....ANSWER.....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.....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.....15mm from distal tip of fibula
,Page 2 of 110
tensioning atfl ib .....ANSWER.....neutral with 10-15 degrees
plantar flexion
medial mal anchor for deltoid ib .....ANSWER.....medial mal in
intercollicular grove w/ 4.75 anchor
talus anchor in deltoid ib .....ANSWER.....deep deltoid,
12.2mm/1cm in talus
sustentaculum tali anchor for deltoid ib .....ANSWER.....superficial
deltoid, 8mm anterior
deltoid recon .....ANSWER.....superficial tibiocalcaneal & deep
posterior tibiotalar
superficial deltoid .....ANSWER.....4, resists eversion of hindfoot
deep deltoid .....ANSWER.....2, medial ankle sprain, lateral ankle
sprain, ankle fracture, flatfoot
,Page 3 of 110
mechanical instability .....ANSWER.....clinical and radiographic
evidence that demonstrates excess movement of the talus within
ankle mortise
functional instability .....ANSWER.....subjective complaint of
patient
sorain classifications .....ANSWER.....Grade 1: ATFL sprain
Grade 2: ATFL & CFL partial tear
Grade 3: ATFL, CFL, and possibly PTFL
sural & superficial peroneal .....ANSWER.....nerves to watch out
for with ATFL IB
syndesmosis mechanism of injury .....ANSWER.....forced external
rotation of the foot (specifically talus)
syndesmosis function .....ANSWER.....resists movement of:
coronal translation (side to side/left to right)
rotational
, Page 4 of 110
sagital translation (forward or backwards)
ideally syndesmosis resists diastesis but allows normal
physiological micro-motion
Aitfl mechanism of injyry .....ANSWER.....external rotation ->
force of the talus pushing on fibula causes tear/stress
when to use aitfl internal brace .....ANSWER.....Re-assess
syndesmotic motion. mild rotational instability
Weber Classifications .....ANSWER.....based on level of fibula
fracture compared to ankle/syndesmosis joint & better for
surgical decision making
Weber A .....ANSWER.....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
