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DEX FINAL STUDY GUIDE 2024 WITH COMPLETE SOLUTIONS
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DEX FINAL STUDY GUIDE
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DEX FINAL STUDY GUIDEMost common mechanism of injury in distal radius fx
FOOSH + Dorsiflexion
What complication is commonly associated with distal radius fx?
median nerve dmg / carpal tunnel compression sx
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Describe the normal radiographic measurements for:
Radial inclination
Radial length(height)
Volar (radial) tilt
Incline: 22
Length: 11
Tilt: 11
What is the Frykman classification used for?
Distal Radius (usually Colles) fx
What is the most common type of distal radius fx?
Colles
What is a Smith fx?
"Reverse Colles fx"
"garden spade"
Volar angulation (apex dorsal)
Volar displacement
+radial shortening
What is the most popular method of surgical distal radius repair?
Volar locking plates
(Dorsal -> ext tendon complications)
What is PES PLANUS (flatfoot) deformity?
Loss of the normal medial longitudinal arch
What is the MAIN FUNCTION of the subtalar (or talocalcaneal) joint?
INVERSION and EVERSION
Note: The subtalar joint plays NO ROLE in dorsal or plantar flexion
What is the SINUS TARSI?
The space between the talus and calcaneus
, What are 2 FUNCTIONS of the spring (or calcanealnavicular) ligament?
1. Provides support to the medial arch
2. Supports the talar head
Note: If the spring ligament is injured it is the main reason for flat foot deformity
Deltoid ligament: how many layers? What are their names?
Two layers: superficial layer and deep layer
Deltoid ligament: how many components make up each layer? What are their names?
4 Components of the superficial layer:
1) Tibionavicular ligament
2) Tibiospring ligament
3) Tibiocalcaneal ligament
4) Superficial posterior tibiotalar ligament
2 Components of the deep layer:
1) Deep anterior tibiotalar ligament
2) Deep posterior tibiotalar ligament (strongest portion, primary stabilizer in the medial ankle)
What does "Tom, Dick, And Nervous Henry" stand for?
[T]ibialis posterior
flexor [D]igitorum longus
tibial [A]rtery
tibial [N]erve
flexor [H]allucis longus
What is the "Master Knot of Henry?"
An anatomical landmark made up of FDL tendon and FHL tendon
Identifies the FDL for harvesting purposes
What NEUROVASCULAR STRUCTURES should you be aware of?
Sural nerve (lateral)
Superficial peroneal nerve (lateral)
Neurovascular bundle (medial)
Tibial artery (medial)
Tibial nerve (medial)
Pathology of Flatfoot Deformity
Collapse of entire medial longitudinal arch with the entire sole of the foot in contact with the
ground
Thought to be caused by the dysfunction of the posterior tibalis tendon, PTT, which provides the
dynamics support to maintain medial longitudal arch
Can also be caused by deficiency of the Spring ligament complex, which supports the Talar head
on the medial side
The peek incidents of flatfoot deformity in the adult population is seen between 50 to 70 years
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