Piano Key Sign and Examination of DRUJ Instability

Description

This video demonstrates a physical examination technique for assessing instability in the distal radial ulnar joint (DRUJ), focusing on the piano key sign. The presenter first explains the proper hand positions and movements during the examination, contrasting physiological movement with pathological instability. Using a resident for demonstration, the examination is carried out by checking the range of movement in both ulnar and radial deviation, providing insights into what constitutes normal versus excessive movement. Following this, a patient with a history of injury and pain during rotation is examined, revealing pronounced instability characterized by excessive movement. The piano key sign is then demonstrated, showcasing how pressing on the joint results in an abnormal popping motion indicative of instability. This instructional video serves as an educational guide for medical professionals learning to assess wrist joint stability effectively.

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