Shuck Test or Ballottement Test For Wrist Instability
Shuck test or Shear test, also called Ballottement test is done for lunatotriquetral instability
The test is performed by applying a dorsally directed pressure to the pisiform and a palmarly directed pressure to the lunate [Lunate can be palpated beyond dorsal and ulnar corner of the radius.]
The maneuver results in a shearing stress on lunatotriquetral joints and vector across the lunotriquetral joint.
A creptation or clicking associated with reproduction of pain is indicative of lunatotriqutral dissociation.
The triquetrum is displaced dorsally and palmarly on the lunate.
The test may be false negative in cases of ligamentous laxity.
Here is a nice demonstration of Shuck test.
Scaphoid Shift Test or Watson Test For Wrist Instability
Watson test or Scaphoid shift test is a wrist provocative stress test done for Scapholunate instability.
Watson test is a combination of pain and a palpable clunk when the wrist is brought from ulnar deviation into radial deviation while pressure is applied to the palmar aspect of the scaphoid tubercle. [See Video below]
This test indicates but is not absolutely specific for scapholunate dissociation. A false positive result can also be obtained in individuals with lax ligaments
Here is a video demonstration of the test
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