Bone Surface Variation With vs. Without GWMD (CORO)

Carpal bone instability occurs when the ligaments holding the scaphoid, lunate, and triquetrum together (the scapholunate (SL) and lunotriquetral (LT) ligaments) are torn, allowing these bones to shift out of alignment during wrist motion. Tracking each bone's cross-sectional area across the motion cycle provides a way to assess whether the imaging plane is capturing this motion, since larger fluctuations can reflect out-of-plane displacement.

This video compares the scaphoid, lunate, and triquetrum surface area over time, acquired with and without the guidance wrist movement device (GWMD). In the coronal plane, the GWMD significantly reduced bone-area variation amplitude for the lunate and scaphoid, with triquetrum showing a similar but non-significant trend, supporting its role in constraining the wrist to the imaging plane and standardizing acquisition conditions. This effect was less consistent in the oblique axial planes (SL, LT), where amplitude differences between conditions did not reach significance.