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Ballottement test (shuck test): Lunotriquetral instability



- Discussion:
   - triquetrum is displaced dorsally and palmarly on the lunate, demonstrating increase excursion over the normal side and often a painful crepitus;
   - compression test: displacement of the triquetrum ulnarly during radioulnar deviation, which is also painful;
Shear test:
     - for triquetrolunate strain;
     - shear force applied at this joint while stabilizing lunate dorsally and pisotriquetral plane volarly