Assessment of scapholunate instability with dynamic computed tomography

Area of Science:

• Orthopedics
• Radiology
• Medical Imaging

Background:

• Chronic scapholunate instability is a common wrist condition.
• Accurate assessment is crucial for effective treatment planning.

Purpose of the Study:

• To evaluate the diagnostic value of dynamic four-dimensional computed tomography (4DCT) in assessing suspected chronic scapholunate instability.
• To compare 4DCT findings with conventional radiography and arthrography.

Main Methods:

• Prospective study of 40 patients with suspected chronic scapholunate instability.
• Evaluation using plain radiographs, arthrography, and dynamic 4DCT during radioulnar deviation.
• Analysis of scapholunate gap size and range during dynamic motion.

Main Results:

• 4DCT demonstrated varying scapholunate gap sizes correlating with instability severity.
• Mean and maximal gap sizes were lowest in patients without instability and highest in those with definite instability.
• The range of gap sizes was significantly higher in patients with questionable instability compared to those without.

Conclusions:

• Dynamic 4DCT is a valuable tool for assessing chronic scapholunate instability.
• 4DCT enables differentiation between patients with absent, questionable, and definite scapholunate instability.
• This imaging modality can aid in surgical decision-making for wrist injuries.