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In radiology, the Terry-Thomas sign is a scapholunate ligament dissociation on an anteroposterior view of the wrist. [1] [2] Most commonly a result of a fall on the outstretched hand , the scapholunate ligament ruptures resulting in separation of the lunate and scaphoid bones. This burst causes the scaphoid bone to dorsally rotate. [3]
Scapholunate advanced collapse (also known as SLAC wrist) is a type of wrist osteoarthritis. SLAC wrist is the most common type of post-traumatic wrist osteoarthritis [ 1 ] and is often the result of an undiagnosed or untreated scapholunate ligament rupture. [ 2 ]
Scapholunate advanced collapse is the most common form, followed by scaphoid non-union advanced collapse (SNAC). [3] Other post-traumatic causes such as intra-articular fractures of the distal radius or ulna can also lead to wrist osteoarthritis, but are less common.
X-ray images indicate scapholunate ligament instability when the scapholunate distance is more than 3 mm, which is called scapholunate dissociation. [7] A static scapholunate instability is generally readily visible, but a dynamic scapholunate instability can only be seen radiographically in certain wrist positions or under certain loading conditions, such as when clenching the wrist, or ...
The physical exam may show tenderness by palpation over the scapholunate ligament on the back of the wrist, immediately below the radius. [1] [4] Swelling and deformities are the two clinical signs associated with arthritis. The wrist is clinically tested by slight flexion while the physician feels the back of the wrist with the thumb. [4]
TMC OA is diagnosed based on symptoms and signs. [8] Radiographs can confirm the diagnosis and the severity of TMC OA. Other diagnoses in this region include scaphotrapezial trapezoid arthritis and first dorsal compartment tendinopathy ( De Quervain syndrome ) although these are usually easy to distinguish.
Scapholunate dissociation II Lunocapitate disruption III Lunotriquetral disruption IV Lunate dislocation References. External links This page was last edited ...
The SL angle is an indicator of dorsal intercalated segment instability deformity (DISI). The SL angle goes between: [1] - A line through the long axis of the scaphoid bone. ...