DEX IOT DAY 4 TEST - MIDFOOT & FOREFOOT EXAM (2026) QUESTIONS AND (elaborated)
WITH COMPLETE SOLUTIONS/NEWEST UPDATE!!!
Question 1
Where is the Lisfranc joint located in the human foot?
A) Between the talus and the navicular
B) Between the calcaneus and the cuboid
C) Spanning the entire midfoot articulation with the metatarsals
D) Between the phalanges and the metatarsals
E) At the level of the ankle mortise
Correct Answer: C) Spanning the entire midfoot articulation with the metatarsals
Rationale: The Lisfranc joint, also known as the tarsometatarsal (TMT) joint complex, is
the articulation between the five metatarsals and the three cuneiforms plus the cuboid.
Question 2
What is the "keystone conformation" that provides inherent stability to the Lisfranc joint?
A) The 1st metatarsal sitting on the medial cuneiform
B) The 5th metatarsal and cuboid articulation
C) The recessing of the 2nd metatarsal base into the middle cuneiform
D) The connection between the navicular and the talus
E) The overlap of the lateral cuneiform and the 3rd metatarsal
Correct Answer: C) Connection between 2nd met and middle cuneiform that provides
stability to lisfranc joint
Rationale: The 2nd metatarsal base is "mortised" into a socket formed by the cuneiforms.
Because the 2nd metatarsal is shorter and recessed compared to the 1st and 3rd, it acts as a
"keystone" for the arch.
Question 3
The Lisfranc ligament specifically connects which two bones?
A) Medial cuneiform and the base of the 1st metatarsal
B) Medial cuneiform and the base of the 2nd metatarsal
C) Middle cuneiform and the base of the 2nd metatarsal
D) Lateral cuneiform and the 3rd metatarsal
E) Navicular and the 2nd metatarsal
Correct Answer: B) Medial cuneiform to base of 2nd met
Rationale: There is no ligamentous connection between the 1st and 2nd metatarsals.
Instead, the Lisfranc ligament provides the primary oblique stabilization between the
medial cuneiform and the 2nd metatarsal base.
Question 4
What are the three distinct aspects of the Lisfranc ligament?
A) Medial, Lateral, Central
B) Anterior, Posterior, Middle
, 2
C) Dorsal, Interosseous, Plantar
D) Superficial, Deep, Intermediate
E) Cortical, Cancellous, Fibrous
Correct Answer: C) Dorsal, interosseous, plantar
Rationale: The Lisfranc ligament is comprised of three parts. The interosseous and plantar
ligaments are the strongest, while the dorsal aspect is the weakest and often the first to fail.
Question 5
Which bones constitute the "Lisfranc Complex"?
A) 1st and 5th metatarsals only
B) 1st and 2nd metatarsals plus medial and middle cuneiforms
C) Navicular, Talus, and Calcaneus
D) 2nd through 4th metatarsals only
E) Cuboid and lateral cuneiform
Correct Answer: B) 1st and 2nd met & medial and middle cuneiform
Rationale: While the joint spans the whole midfoot, clinical "Lisfranc pathology" primarily
focuses on the relationship and stability between the first two metatarsals and their
corresponding cuneiforms.
Question 6
What mechanism of injury typically leads to instability and "gapping" between the bones of the
Lisfranc complex?
A) Lateral inversion (Ankle sprain)
B) Direct blunt trauma to the heel
C) Axial loading of the foot
D) Excessive dorsiflexion of the toes
E) Chronic overuse from running
Correct Answer: C) Axial load
Rationale: An axial load applied through the foot (such as a fall or a heavy object landing on
a plantarflexed foot) forces the bones apart, rupturing the Lisfranc ligament and causing
diastasis (gapping).
Question 7
Which column of the foot possesses the most inherent flexibility?
A) Medial column
B) Central column
C) Lateral column
D) Posterior column
E) All columns have equal flexibility
Correct Answer: C) Lateral column
Rationale: The 4th and 5th metatarsals (lateral column) are designed for mobility and shock
, 3
absorption, whereas the medial and central columns are rigid for power during the push-
off phase of gait.
Question 8
Which of the following describes a "direct" Lisfranc injury?
A) A twist of the ankle while running
B) An axial load with combined dorsal and plantar forces
C) A heavy object falling on a plantarflexed foot
D) Stepping into a hole
E) High-impact jumping on a flat foot
Correct Answer: B) axial load with dorsal and plantar forces
Rationale: Direct injuries occur when a force strikes the midfoot directly, often resulting in
complex fracture patterns and significant soft tissue damage.
Question 9
What describes an "indirect" Lisfranc injury mechanism?
A) Crushing injury from a car tire
B) Axial load applied to a plantarflexed foot
C) Repetitive stress in a marathon runner
D) Direct kick to the metatarsals
E) Laceration to the dorsum of the foot
Correct Answer: B) Plantarflexed foot with axial load
Rationale: Indirect injuries are often seen in athletes where the foot is pointed down
(plantarflexed) and a weight or force is applied to the heel, shifting the tarsals anteriorly or
posteriorly.
Question 10
Which diagnostic tool is considered necessary to accurately identify a Lisfranc injury?
A) Non-weightbearing X-ray
B) Weightbearing X-ray
C) Ultrasound of the plantar fascia
D) Simple physical palpation only
E) Arterial doppler
Correct Answer: B) Weightbearing X-ray
Rationale: Ligamentous instability may not be visible on standard X-rays. Stressing the
joint with weightbearing reveals the characteristic "gapping" between the 1st and 2nd
metatarsals.
Question 11
In Lisfranc imaging, what does the "Fleck Sign" represent?
A) A stress fracture of the 5th metatarsal
WITH COMPLETE SOLUTIONS/NEWEST UPDATE!!!
Question 1
Where is the Lisfranc joint located in the human foot?
A) Between the talus and the navicular
B) Between the calcaneus and the cuboid
C) Spanning the entire midfoot articulation with the metatarsals
D) Between the phalanges and the metatarsals
E) At the level of the ankle mortise
Correct Answer: C) Spanning the entire midfoot articulation with the metatarsals
Rationale: The Lisfranc joint, also known as the tarsometatarsal (TMT) joint complex, is
the articulation between the five metatarsals and the three cuneiforms plus the cuboid.
Question 2
What is the "keystone conformation" that provides inherent stability to the Lisfranc joint?
A) The 1st metatarsal sitting on the medial cuneiform
B) The 5th metatarsal and cuboid articulation
C) The recessing of the 2nd metatarsal base into the middle cuneiform
D) The connection between the navicular and the talus
E) The overlap of the lateral cuneiform and the 3rd metatarsal
Correct Answer: C) Connection between 2nd met and middle cuneiform that provides
stability to lisfranc joint
Rationale: The 2nd metatarsal base is "mortised" into a socket formed by the cuneiforms.
Because the 2nd metatarsal is shorter and recessed compared to the 1st and 3rd, it acts as a
"keystone" for the arch.
Question 3
The Lisfranc ligament specifically connects which two bones?
A) Medial cuneiform and the base of the 1st metatarsal
B) Medial cuneiform and the base of the 2nd metatarsal
C) Middle cuneiform and the base of the 2nd metatarsal
D) Lateral cuneiform and the 3rd metatarsal
E) Navicular and the 2nd metatarsal
Correct Answer: B) Medial cuneiform to base of 2nd met
Rationale: There is no ligamentous connection between the 1st and 2nd metatarsals.
Instead, the Lisfranc ligament provides the primary oblique stabilization between the
medial cuneiform and the 2nd metatarsal base.
Question 4
What are the three distinct aspects of the Lisfranc ligament?
A) Medial, Lateral, Central
B) Anterior, Posterior, Middle
, 2
C) Dorsal, Interosseous, Plantar
D) Superficial, Deep, Intermediate
E) Cortical, Cancellous, Fibrous
Correct Answer: C) Dorsal, interosseous, plantar
Rationale: The Lisfranc ligament is comprised of three parts. The interosseous and plantar
ligaments are the strongest, while the dorsal aspect is the weakest and often the first to fail.
Question 5
Which bones constitute the "Lisfranc Complex"?
A) 1st and 5th metatarsals only
B) 1st and 2nd metatarsals plus medial and middle cuneiforms
C) Navicular, Talus, and Calcaneus
D) 2nd through 4th metatarsals only
E) Cuboid and lateral cuneiform
Correct Answer: B) 1st and 2nd met & medial and middle cuneiform
Rationale: While the joint spans the whole midfoot, clinical "Lisfranc pathology" primarily
focuses on the relationship and stability between the first two metatarsals and their
corresponding cuneiforms.
Question 6
What mechanism of injury typically leads to instability and "gapping" between the bones of the
Lisfranc complex?
A) Lateral inversion (Ankle sprain)
B) Direct blunt trauma to the heel
C) Axial loading of the foot
D) Excessive dorsiflexion of the toes
E) Chronic overuse from running
Correct Answer: C) Axial load
Rationale: An axial load applied through the foot (such as a fall or a heavy object landing on
a plantarflexed foot) forces the bones apart, rupturing the Lisfranc ligament and causing
diastasis (gapping).
Question 7
Which column of the foot possesses the most inherent flexibility?
A) Medial column
B) Central column
C) Lateral column
D) Posterior column
E) All columns have equal flexibility
Correct Answer: C) Lateral column
Rationale: The 4th and 5th metatarsals (lateral column) are designed for mobility and shock
, 3
absorption, whereas the medial and central columns are rigid for power during the push-
off phase of gait.
Question 8
Which of the following describes a "direct" Lisfranc injury?
A) A twist of the ankle while running
B) An axial load with combined dorsal and plantar forces
C) A heavy object falling on a plantarflexed foot
D) Stepping into a hole
E) High-impact jumping on a flat foot
Correct Answer: B) axial load with dorsal and plantar forces
Rationale: Direct injuries occur when a force strikes the midfoot directly, often resulting in
complex fracture patterns and significant soft tissue damage.
Question 9
What describes an "indirect" Lisfranc injury mechanism?
A) Crushing injury from a car tire
B) Axial load applied to a plantarflexed foot
C) Repetitive stress in a marathon runner
D) Direct kick to the metatarsals
E) Laceration to the dorsum of the foot
Correct Answer: B) Plantarflexed foot with axial load
Rationale: Indirect injuries are often seen in athletes where the foot is pointed down
(plantarflexed) and a weight or force is applied to the heel, shifting the tarsals anteriorly or
posteriorly.
Question 10
Which diagnostic tool is considered necessary to accurately identify a Lisfranc injury?
A) Non-weightbearing X-ray
B) Weightbearing X-ray
C) Ultrasound of the plantar fascia
D) Simple physical palpation only
E) Arterial doppler
Correct Answer: B) Weightbearing X-ray
Rationale: Ligamentous instability may not be visible on standard X-rays. Stressing the
joint with weightbearing reveals the characteristic "gapping" between the 1st and 2nd
metatarsals.
Question 11
In Lisfranc imaging, what does the "Fleck Sign" represent?
A) A stress fracture of the 5th metatarsal
