Orthonotes
Orthonotes
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v3.0 Fusion
v3.0 Fusion
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Scapho-Lunate Instability

Most common carpal instability; due to disruption of scapholunate ligament. Clinical: wrist pain, weakness, clicking; positive Watson’s test. Radiology: gap >3 mm (‘Terry Thomas sign’), DISI deformity. Acute injury—repair; chronic—reconstruction or salvage (four-corner fusion). Untreated cases progress to SLAC wrist (Scapholunate Advanced Collapse).

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Most common carpal instability; due to disruption of scapholunate ligament. Clinical: wrist pain, weakness, clicking; positive Watson’s test. Radiology: gap >3 mm (‘Terry Thomas sign’), DISI deformity. Acute injury—repair; chronic—reconstruction or salvage (four-corner fusion). Untreated cases progress to SLAC wrist (Scapholunate Advanced Collapse).
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MCQs

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Question 1

What is the recommended treatment for an acute scapholunate ligament tear?

Question 2

What is the characteristic deformity seen in scapholunate instability?

Question 3

Which of the following statements about the scapholunate ligament is true?

Question 4

What is the long-term outcome of untreated scapholunate instability?

Question 5

What is the most common cause of scapholunate instability?

Question 6

Which clinical test is most commonly used to assess scapholunate instability?

Question 7

What radiological sign is indicative of scapholunate instability?

Question 8

What is the typical mechanism of injury for scapholunate instability?

Question 9

Which of the following conditions may result from untreated scapholunate instability?

Question 10

In the Geissler grading system, what does a Grade II injury indicate?