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31 Cards in this Set
- Front
- Back
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How many parts does the extensor tendon of the finger divide into
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there is a single extensor tendon that divides into 3 parts
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What causes a mallet finger deformity
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disruption of the distal part of the extensor tendon of the finger
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How does the buotonniier deformity occur
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This flexion deformity of the proximal interphalangeal joint is due to interruption of the central slip of the extensor tendon such that the lateral slips separate and the head of the proximal phalanx pops through the gap like a finger through a button hole
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How does a volar plate fracture occur
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commonly following a dislocation, it is a hyperextension injury
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What is the volar plate
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Volar plate forms floor of PIP joint and separates the joint space from the flexor tendons
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What joint is injured in a volar plate fracture
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Involves PIP joint of fingers
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What does the term volar refer to
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Pertaining to both the palm and sole
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When do volar plate fractures occur
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Injury to the PIP joint is relatively common in athletics, especially sports involving ball-handling
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Can there be a volar plate injury without fracture
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Primarily a ligamentous injury that can result in fracture
The fracture is at the base of the middle phalanx |
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What can happen if the force of the hyperextension is severe
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If force of injury is great enough, dorsal dislocation of middle phalanx can occur
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Where is the dorsum of the hand
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opposite palm
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Can volar plate completely rupture
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Rupture of volar plate may occur with longitudinal splitting of the collateral ligament structures
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What is a potential complication of a volar plate fracture
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joint instability
Associated collateral ligament tear |
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What is a finding if someone had a collateral ligament tear following a volar plate injury
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the collateral ligament may heal with abundant fibrous tissue producing bump on one side of joint
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What if the bone fragment of a volar plate fracture is more than 35% of the articular surface
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it may require surgical pinning bc these injuries are often unstable, exhibiting persistent subluxation of the middle phalanx
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What is another name for gamekeepers thumb
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''skiers thumb which is an acute injury now more common amongst skiers
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How does a skier get a gameskeeper fracture
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Due to fall on fall on outstretched hand with abducted thumb caught in pole strap
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What is a gameskeeper thumb injury
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Injury results in disruption of the ulnar collateral ligament at its site of insertion on the metacarpal-phalangeal joint of thumb
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What is the ulnar collateral ligament of the thumb
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UCL is short ligament that originates from the metacarpal head and inserts into medial aspect and base of proximal phalanx of thumb
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Does the thumb have a middle phalange
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no
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What are the joints of the thumb
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metacarpalphalangeal joint
interphalangeal joint |
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What is the name of the joints between the carpal and metacarpal bones
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carpometacarpal joint
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Does a gameskeeper thumb always result in fracture of the thumb
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no, but it is often associated with a fracture of the base of the proximal phalanx
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How do you evaluate a gameskeeper thumb injury with imaging
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full evaluation requires abduction stress views
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How is the abduction stress view done
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This is done by comparing both thumbs laterally side by side and an increase of more than 30° in angle between 1st metacarpal and proximal phalanx Indicates subluxation
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What are the joints of the hand
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Where is the ulnar collateral ligament of the thumb
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What is a stener lesion
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What can turn a gameskeeper thumb into a stener lesion
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external force on a thumb that has a UCL that is already torn
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What is kienbach disease
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It is breakdown of the lunate bone, a carpal bone in the wrist that articulates with the radius in the forearm. Specifically, Kienbock's disease is another name for avascular necrosis
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What is kienbach disease
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It is breakdown of the lunate bone, a carpal bone in the wrist that articulates with the radius in the forearm. Specifically, Kienbock's disease is another name for avascular necrosis
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