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14 Cards in this Set
- Front
- Back
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With thumb pinch, where are the greatest forces experienced?
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Carpometacarpal (CMC) joint
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What four ligamentous structure contribute to CMC joint stability? s
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Anterior oblique ligament(AOL)
Dorsoradial capsule Posterior oblique ligament lntermetacarpal ligament |
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Of these, which is considered the most important for CMC stability?
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AOL
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How can a radiographic stress view be obtained to evaluate stability?
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Anteroposterior (AP) view with both thumbs radially abducting against each other
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With chronic AOL disruption, what happens at the CMC joint?
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Metacarpal base subluxates dorsally
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Dorsal CMC subluxation may be associated with what process at the MP joint?
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Compensatory hyperextension at the MP joint
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If MP hyperextension is present, what is the preferred intervention at the MP joint?
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Capsulodesis or arthrodesis to correct
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In what direction do degenerative changes occur at the CMC joint?
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Volar to dorsal
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Degeneration at what other site is a contraindication to CMC arthritis arthrodesis?
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Scaphoid-trapezium-trapezoid (STT)
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ln older patients, what is the most common procedure for diffuse CMC ligament arthritis?
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Trapezium excision with or without interposition
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What are the disadvantages of resection arthroplasty for CMC arthritis?
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Weakness with pinch
Thumb shortening Decreased ability to adduct thumb |
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Quick review: in what fracture does the deep anterior oblique ligament (palmar beak ligament) also play a key role?
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Anterior oblique ligament is the primary restraint in a Bennett’s fracture
Anterior oblique ligament anchors volar lip of metacarpal to tubercle of the trapezium; small volar lip fragment remains attached to anterior oblique ligament, which is attached to trapezium |
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What tendon provides the primary displacing force with a Bennett's fracture?
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Abductor pollicis longus
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What is the ideal radiographic view for identifying fourth/fifth carpometacarpal dislocations?
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30 degree pronated view
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