钢琴键标志
Original Editor-Joseph Ayotunde Aderonmu
Top Contributors-Joseph Ayotunde AderonmuandChelsea Mclene
Purpose[edit|edit source]
The Piano-Key Sign Test is a test carried out for the clinical assessment of wrist instability.[1]It is used as an indicator for distal radio-ulnar joint instability and tears of the triangular fibrocartilage complex of thewrist.[1]
Technique[edit|edit source]
In the Piano-key Sign Test, the wrist is supported in pronation and the hand is stabilized in the neutral position. Force is applied to the head of ulna.
Positive Result[edit|edit source]
The test is positive if the ulnar head goes back to its anatomic position after the removal of the force applied to the ulnar head.[2]This bears resemblance with when a piano key springs up after the force from a finger is removed from the key, hence, the name "piano-key" sign.[2]This instability and pain are judged relative to the contralateral wrist.[3]
Negative Result[edit|edit source]
No instability or movement observed on removal of pressure on the ulnar head.
Instructional Video[edit|edit source]
Sensitivity/Specificity[edit|edit source]
The Piano-key Sign Test has a specificity of 0.96 and a sensitivity of 0.59.[4]
References[edit|edit source]
- ↑1.01.1Vezeridis PS, Yoshioka H, Han R, Blazar P.Ulnar-sided wrist pain. Part I: anatomy and physical examination.Skeletal radiology. 2010 Aug;39(8):733-45.
- ↑2.02.1American Society for Surgery of the Hand. The hand: examination and diagnosis. Churchill Livingstone; 1990.
- ↑Duke Orthopaedics: Wheeless’Textbook of Orthopaedics[last accessed February 11, 2022].
- ↑Lindau T, Adlercreutz C, Aspenberg P.Peripheral tears of the triangular fibrocartilage complex cause distal radioulnar joint instability after distal radial fractures.The Journal of hand surgery. 2000 May 1;25(3):464-8.
