Piano key sign is observed to assess instability at which joint?

Study for the NBCOT Hand Injuries and Intervention Test. Prepare with flashcards and multiple choice questions, each question offers hints and explanations. Get ready for success!

Multiple Choice

Piano key sign is observed to assess instability at which joint?

Piano key sign assesses instability of the acromioclavicular joint. When the lateral end of the clavicle is pressed, a torn or stretched AC (and often coracoclavicular) ligaments allows the distal clavicle to move up and down, so it can be depressed with pressure and then spring back to its elevated position—like a piano key being pressed and released. A positive sign indicates AC joint instability or shoulder separation rather than a nerve or carpal condition. The other signs listed diagnose issues in the hand or wrist (nerve compression) and are not about the AC joint.

Piano key sign assesses instability of the acromioclavicular joint. When the lateral end of the clavicle is pressed, a torn or stretched AC (and often coracoclavicular) ligaments allows the distal clavicle to move up and down, so it can be depressed with pressure and then spring back to its elevated position—like a piano key being pressed and released. A positive sign indicates AC joint instability or shoulder separation rather than a nerve or carpal condition. The other signs listed diagnose issues in the hand or wrist (nerve compression) and are not about the AC joint.

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