Abstract
Background The purpose of this article was to review the anatomy, kinematics of the distal radioulnar
joint (DRUJ), and to discuss definition, classification, and diagnosis of DRUJ instability.
Methods A biomechanical perspective on physical examination of DRUJ ballottement test was
documented. Physiological dynamic DRUJ translation and differences of the translation
following sequential ligament sectioning and changes in different forearm and wrist
positions were demonstrated. The clinical significance of each ligament's contribution
to joint stability in specific wrist positions was addressed.
Conclusion Each ligament stabilizing the DRUJ contributed to joint stability depending on the
direction (palmer or dorsal) and different positions of the wrist and forearm. DRUJ
ballottement test in each wrist and forearm position may detect tears of specific
ligament stabilizing the DRUJ.
Keywords
DRUJ - TFCC - biomechanics - anatomy - function