DEX IOT DAY 4 TEST NEWEST ACTUAL

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DEX IOT DAY 4 TEST NEWEST ACTUAL

EXAM 250 QUESTIONS AND CORRECT

DETAILED ANSWERS (VERIFIED ANSWERS )

|ALREADY GRADED A+

Where is the lisfranc joint? - ANSWER- Spans the entire midfoot articulation with the metatarsals

What is the keystone conformation? - ANSWER- Connection between 2nd met and middle cuneiform that provides stability to lisfranc joint

What does the lisfranc ligament connect? - ANSWER- Medial cuneiform to base of 2nd met

Three aspects of lisfranc ligament: - ANSWER- Dorsal,

interosseous, plantar

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What makes up the lisfranc complex? - ANSWER- 1st and 2nd met & medial and middle cuneiform

What type of injury typically causes instability and gapping between bones of lisfranc complex? - ANSWER- Axial load

Which column of the foot has the most flexibility? - ANSWER- Lateral column

What mechanisms of injury occur with lisfranc pathology? - ANSWER- Direct or indirect, high energy or low energy

What constitutes a direct injury? - ANSWER- axial load with dorsal and plantar forces

What constitutes an indirect injury? - ANSWER- Plantarflexed foot with axial load (heavy object falling on foot- tarsals shift anterior or posterior)

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What is necessary to diagnose lisfranc injury? - ANSWER- Weightbearing x-ray

What is a fleck sign? - ANSWER- Avulsion fracture between 2nd met and medial cuneiform

What type of lisfranc injuries do not require surgery? - ANSWER- Nondisplaced and stable

Lisfranc stability relies on ____ anatomy, while displacement relies on _____ anatomy - ANSWER- Ligamentous, bony

What is a downside of fixing/fusing lisfranc injury with screws? - ANSWER- No micromotion - they can break

What is a benefit of lisfranc ORIF with plates? - ANSWER- Plate fixation maintains stability without violating the articular surface

What is ligamentous lisfranc augmentation (mini tightrope, internal brace) typically indicated for? - 3 / 4

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ANSWER- Low energy injuries, mostly young adults and highly active individuals

What is the gold standard for lisfranc injury fixation? - ANSWER- Plates and screws

What % of all fractures are lisfranc injuries? - ANSWER- 0.2%

Who treats most lisfranc injuries? - ANSWER- Sports surgeons

What is the role of hardware in ORIF? - ANSWER- Maintains reduction, hardware eventually removed

Role of hardware in fusion? - ANSWER- Compresses fusion, hardware left in place

What are lisfranc (diamond) plates indicated for? - ANSWER- Fixation or fusion; high or low energy injuries; orientations left and right; sizes S,M,L; oblong

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