TEST 5 Flashcards
Foot
Joining of 3 joints into 1
coalition
How do you separate the 1st and 2nd cuneiform
a lateral oblique where the foot is rotated 30 degrees
What CR angulation is used for an axial plantodorsal projection to view the sustentaculum tali
40 degrees posterior
which term describes the normal gain of the lower limbs that we must overcome win producing an anatomically correct AP projection of the lower limb
anteversion
what line do you use when positioning an AP mortise projection
inner molaler line
Where is the CR centered for a dorsoplantar projection of the foot?
3rd MT joint
A patient comes to radiology with a possible Lis Franc injury. Define a Lis Franc injury.
A Lis Franc is an injury to the Lis Franc ligament between the base of the first and second metatarsal. It can range from a simple tear to a fracture of one of the metatarsals
What positioning routine should be performed for a possible Lis Franc injury?
A weight-bearing bilateral foot series would be ideal. Also, a lateral projection, weight-bearing can be performed.
What are the typical radiograph signs of a positive Lis Franc injury?
Radiographic sign for a positive Lis Franc injury is a separation between the base of the 1st and 2nd metatarsals.
Patient comes to radiology with a possible Jones’ fracture. Define a Jones’ fracture?
A Jones’ fracture is a fracture to the base/tuberosity of the 5th metatarsal.
What anatomy does a jones fracture involve?
Base or tuberosity of the 5th metatarsal.
Which specific projection will be demonstrate a jones fracture?
The medial oblique foot along with an offset or fan lateral projections of the foot will best demonstrate a Jones’ fracture.
Which of the following positions would best demonstrate the longitudinal arch of the foot?
Lateral weight-bearing
Situation: A patients enters ER with a severe ankle sprain. Initial radiographs do not indicate a fracture of the bony aspects of the ankle. What special projections can be taken to rule out possible ligament damage to one or more aspects of the ankle joint?
Inversion and eversion AP stress projections of the ankle
What specific projections would be performed for a 4th toe? Indicate any required angulation for these projections
An AP with 10-15 degree posterior angle, lateral oblique and mediolateral projections.
How many bones are found in the foot?
26
List three aspects of the metatarsal
Head, shaft and base
What specific aspect of the foot is most often fractured?
Tuberosity or base of 5th metatarsal
What is the largest tarsal bone?
Calcaneus
List the two arches of the foot
Longitudinal and transverse
What is the joint classification and movement type for the ankle?
Diarthrodial; saddle
What distinctive foramina is located in the mid-portion of the subtalar joint?
Sinus tarsi
what are the three joint space of the ankle
talomallolar, tibiotalar, talofibular
what is the most common error with a mortise projection
over-obliquity
syndesomosis is a term for
high ankle fracture
what additional projections should be done for a trimalleolar fractures
lower leg projection AP and lateral
why should an AP and lateral projection of the lower leg be performed for a trimalleolar fracture of the ankle
because there could be a fracture of the femoral neck
what two projections are best for assessing a jones fracture
Medial oblique, off set or fan lateral
in the dorsiplantar axial projection what way are the toes flexed
dorsiflexed
what bone goes to the anterior tubercle
tibia
what bones is the trochlea process related to
calcanues
