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    Physiopedia
    https://www.physio-pedia.com › Piano_Key_Sign

    Piano Key Sign - Physiopedia

    How do you perform a piano key test?
    To perform the Piano Key Test, the clinician should have the patient seated with the forearm placed on a stable surface. The clinician will then firmly stabilize the patient’s forearm with one hand while using the other hand to apply pressure to the distal ulna, pushing it dorsally.
    carepatron.com
    Piano Key Sign Test | OrthoFixar 2025

    The clinician firmly stabilizes the distal radius with one hand and grasps the head of the ulna between the thumb and the index finger of the other hand. The ulnar head is depressed in an anterior direction (as in depressing a key on a piano).

    OrthoFixar

    The piano key sign is positive for a triangular fibrocartilage complex (TFCC) tear or triquetral instability if there is excessive movement in an anterior (palmar) direction or if upon release of the ulna, the bone springs back into its high posterior (dorsal) position. There may also be discomfort reported during piano key test.

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    A descriptive study by LaStayo and Howell2found that the Sensitivity & Specificity of Piano Key sign is: 1. Sensitivity: 66% 2. Specificity: 64%

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    Distal Radioulnar Joint DRUJ:

    1. The distal radioulnar joint (DRUJ) plays an important role in wrist and forearm function. 2. The DRUJ is a uniaxial pivot joint that joins the distal radius and ulna and an articular disk. 3. The articular disk, known as the TFCC, assists in binding the distal radius and is the main stabilizer of the DRUJ. 4. At its distal end, the radius widens to form a broad concave articular surface. 5. The articular surface has an ulnar inclination in the frontal plane, which averages 23 degrees, and...

    Triangular Fibrocartilage Complex TFCC:

    1. The TFCC essentially comprises a fibrocartilage disk interposed between the medial proximal row and the distal ulna within the medial aspect of the wrist. 2. The primary function of the TFCC is to enhance joint congruity and to cushion against compressive forces. 3. Indeed the TFCC transmits about 20 percent of the axial load from the hand to the forearm. 4. The broad base of the disk is attached to the medial edge of the ulnar notch of the radius, and its apex is attached to the lateral a...

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