DEX IOT DAY 1 TEST NEWEST 2025/2026 ACTUAL EXAM 250 QUESTIONS AND CORRECT
DETAILED ANSWERS/NEWEST UPDATE!!!!
Question 1
Which ligament is primarily responsible for providing stability to the medial side of the human
ankle?
A) Anterior Talofibular Ligament (ATFL)
B) Calcaneofibular Ligament (CFL)
C) Deltoid Ligament
D) Posterior Inferior Tibiofibular Ligament (PiTFL)
E) Interosseous Ligament (IOL)
Correct Answer: C) Deltoid Ligament
Rationale: The Deltoid Ligament is a strong, triangular band located on the medial side of
the ankle. It consists of superficial and deep layers that prevent eversion and lateral
displacement of the talus.
Question 2
Where are the sesamoid bones typically located in the human foot?
A) Underneath the heel (Calcaneus)
B) Beneath the base of the 5th metatarsal
C) Beneath the Big Toe (1st Metatarsophalangeal joint)
D) On the dorsal aspect of the Navicular
E) Within the sinus tarsi
Correct Answer: C) Beneath the Big Toe
Rationale: The two small, pea-shaped sesamoid bones are embedded within the tendons of
the flexor hallucis brevis beneath the first metatarsal head, acting as a pulley for the big
toe.
Question 3
What is the specific insertion point for the Peroneus Longus tendon?
A) Base of the 5th metatarsal
B) Dorsal aspect of the Navicular
C) Base of the 1st metatarsal and medial cuneiform
D) Sustentaculum tali
E) Lateral malleolus
Correct Answer: C) Base of the 1st Metatarsal
Rationale: The Peroneus Longus tendon travels down the lateral leg, wraps under the
cuboid, and crosses the plantar surface of the foot to insert at the base of the 1st metatarsal
and the medial cuneiform.
Question 4
Which ligament is recognized as the strongest component of the ankle syndesmotic ligament
complex?
, 2
A) Anterior Inferior Tibiofibular Ligament (AiTFL)
B) Interosseous Ligament (IOL)
C) Posterior Inferior Tibiofibular Ligament (PiTFL)
D) Deltoid Ligament
E) Spring Ligament
Correct Answer: C) PiTFL (Posterior Inferior Tibiofibular Ligament)
Rationale: The PiTFL provides the most significant amount of stability to the syndesmosis.
Biomechanical studies indicate it is stronger and thicker than the AiTFL.
Question 5
A high fibula fracture associated with a disruption of the ankle syndesmosis is known as what
eponym?
A) Jones Fracture
B) Lisfranc Injury
C) Maisonneuve Fracture
D) Colles Fracture
E) Boxer's Fracture
Correct Answer: C) Maisonneuve Fracture
Rationale: A Maisonneuve fracture involves a proximal third fibula fracture resulting from
external rotation force. This injury is always associated with a tear of the distal
syndesmosis and often the deltoid ligament.
Question 6
Which three bones articulate to form the ankle joint (talocrural joint)?
A) Tibia, Fibula, and Calcaneus
B) Tibia, Talus, and Navicular
C) Tibia, Fibula, and Talus
D) Fibula, Talus, and Calcaneus
E) Tibia, Talus, and Cuboid
Correct Answer: C) Tibia, Fibula, & Talus
Rationale: The ankle joint is a hinge joint formed by the distal ends of the tibia and fibula
(the mortise) and the trochlea of the talus.
Question 7
The ankle syndesmosis is comprised of which specific group of ligaments?
A) ATFL, CFL, and PTFL
B) AiTFL, PiTFL, and IOL
C) Deltoid, Spring, and Plantar fascia
D) Peroneus Brevis and Longus
E) Tibialis Anterior and Posterior
Correct Answer: B) AiTFL, PiTFL, & IOL
, 3
Rationale: The syndesmosis consists of the Anterior Inferior Tibiofibular Ligament
(AiTFL), the Posterior Inferior Tibiofibular Ligament (PiTFL), and the Interosseous
Ligament (IOL), which hold the tibia and fibula together.
Question 8
The subtalar joint is an articulation that separates which two bones?
A) Tibia from the Talus
B) Fibula from the Tibia
C) Calcaneus from the Talus
D) Navicular from the Cuneiforms
E) Cuboid from the Calcaneus
Correct Answer: C) Calcaneus from the Talus
Rationale: The subtalar joint occurs at the meeting point of the talus and the calcaneus. It is
primarily responsible for inversion and eversion of the hindfoot.
Question 9
In clinical studies of ankle fractures, approximately what percentage of cases are found to have
an associated syndesmotic injury?
A) 5%
B) 10%
C) 20%
D) 50%
E) 75%
Correct Answer: C) 20%
Rationale: Roughly one in five ankle fractures (20%) involves damage to the syndesmotic
ligaments, requiring specific stabilization such as a TightRope or syndesmotic screws.
Question 10
Which of the following statements is true regarding a "Claw Toe" deformity?
A) The PIP joint is extended
B) The MTP joint is flexed
C) The DIP joint is flexed
D) It only affects the big toe
E) It is caused by a tight Achilles
Correct Answer: C) DIP is flexed in claw toe
Rationale: A claw toe is defined by hyperextension of the MTP joint combined with flexion
of both the Proximal Interphalangeal (PIP) and Distal Interphalangeal (DIP) joints.
Question 11
A patient presents with hyperextension of the MTP joint, a flexion deformity of the PIP joint, and
extension of the DIP joint. This is a classic description of:
DETAILED ANSWERS/NEWEST UPDATE!!!!
Question 1
Which ligament is primarily responsible for providing stability to the medial side of the human
ankle?
A) Anterior Talofibular Ligament (ATFL)
B) Calcaneofibular Ligament (CFL)
C) Deltoid Ligament
D) Posterior Inferior Tibiofibular Ligament (PiTFL)
E) Interosseous Ligament (IOL)
Correct Answer: C) Deltoid Ligament
Rationale: The Deltoid Ligament is a strong, triangular band located on the medial side of
the ankle. It consists of superficial and deep layers that prevent eversion and lateral
displacement of the talus.
Question 2
Where are the sesamoid bones typically located in the human foot?
A) Underneath the heel (Calcaneus)
B) Beneath the base of the 5th metatarsal
C) Beneath the Big Toe (1st Metatarsophalangeal joint)
D) On the dorsal aspect of the Navicular
E) Within the sinus tarsi
Correct Answer: C) Beneath the Big Toe
Rationale: The two small, pea-shaped sesamoid bones are embedded within the tendons of
the flexor hallucis brevis beneath the first metatarsal head, acting as a pulley for the big
toe.
Question 3
What is the specific insertion point for the Peroneus Longus tendon?
A) Base of the 5th metatarsal
B) Dorsal aspect of the Navicular
C) Base of the 1st metatarsal and medial cuneiform
D) Sustentaculum tali
E) Lateral malleolus
Correct Answer: C) Base of the 1st Metatarsal
Rationale: The Peroneus Longus tendon travels down the lateral leg, wraps under the
cuboid, and crosses the plantar surface of the foot to insert at the base of the 1st metatarsal
and the medial cuneiform.
Question 4
Which ligament is recognized as the strongest component of the ankle syndesmotic ligament
complex?
, 2
A) Anterior Inferior Tibiofibular Ligament (AiTFL)
B) Interosseous Ligament (IOL)
C) Posterior Inferior Tibiofibular Ligament (PiTFL)
D) Deltoid Ligament
E) Spring Ligament
Correct Answer: C) PiTFL (Posterior Inferior Tibiofibular Ligament)
Rationale: The PiTFL provides the most significant amount of stability to the syndesmosis.
Biomechanical studies indicate it is stronger and thicker than the AiTFL.
Question 5
A high fibula fracture associated with a disruption of the ankle syndesmosis is known as what
eponym?
A) Jones Fracture
B) Lisfranc Injury
C) Maisonneuve Fracture
D) Colles Fracture
E) Boxer's Fracture
Correct Answer: C) Maisonneuve Fracture
Rationale: A Maisonneuve fracture involves a proximal third fibula fracture resulting from
external rotation force. This injury is always associated with a tear of the distal
syndesmosis and often the deltoid ligament.
Question 6
Which three bones articulate to form the ankle joint (talocrural joint)?
A) Tibia, Fibula, and Calcaneus
B) Tibia, Talus, and Navicular
C) Tibia, Fibula, and Talus
D) Fibula, Talus, and Calcaneus
E) Tibia, Talus, and Cuboid
Correct Answer: C) Tibia, Fibula, & Talus
Rationale: The ankle joint is a hinge joint formed by the distal ends of the tibia and fibula
(the mortise) and the trochlea of the talus.
Question 7
The ankle syndesmosis is comprised of which specific group of ligaments?
A) ATFL, CFL, and PTFL
B) AiTFL, PiTFL, and IOL
C) Deltoid, Spring, and Plantar fascia
D) Peroneus Brevis and Longus
E) Tibialis Anterior and Posterior
Correct Answer: B) AiTFL, PiTFL, & IOL
, 3
Rationale: The syndesmosis consists of the Anterior Inferior Tibiofibular Ligament
(AiTFL), the Posterior Inferior Tibiofibular Ligament (PiTFL), and the Interosseous
Ligament (IOL), which hold the tibia and fibula together.
Question 8
The subtalar joint is an articulation that separates which two bones?
A) Tibia from the Talus
B) Fibula from the Tibia
C) Calcaneus from the Talus
D) Navicular from the Cuneiforms
E) Cuboid from the Calcaneus
Correct Answer: C) Calcaneus from the Talus
Rationale: The subtalar joint occurs at the meeting point of the talus and the calcaneus. It is
primarily responsible for inversion and eversion of the hindfoot.
Question 9
In clinical studies of ankle fractures, approximately what percentage of cases are found to have
an associated syndesmotic injury?
A) 5%
B) 10%
C) 20%
D) 50%
E) 75%
Correct Answer: C) 20%
Rationale: Roughly one in five ankle fractures (20%) involves damage to the syndesmotic
ligaments, requiring specific stabilization such as a TightRope or syndesmotic screws.
Question 10
Which of the following statements is true regarding a "Claw Toe" deformity?
A) The PIP joint is extended
B) The MTP joint is flexed
C) The DIP joint is flexed
D) It only affects the big toe
E) It is caused by a tight Achilles
Correct Answer: C) DIP is flexed in claw toe
Rationale: A claw toe is defined by hyperextension of the MTP joint combined with flexion
of both the Proximal Interphalangeal (PIP) and Distal Interphalangeal (DIP) joints.
Question 11
A patient presents with hyperextension of the MTP joint, a flexion deformity of the PIP joint, and
extension of the DIP joint. This is a classic description of:
