What is wrist instability? Instability of the wrist is a common cause of wrist pain. Instability in general is defined as the inability of the osseous structures to maintain their normal anatomic relationship under physiologic loading forces. Instability of the wrist is caused by injury to ligaments of the wrist either on a traumatic or …
What is Kienbocks disease? Kienböck’s disease is due to osteonecrosis of the lunate bone and is a cause of ulnar-sided wrist pain. Radiographs often show collapse of the lunate in advanced cases. The ulna is generally shorter than the radius (negative ulnar variance) with this disorder. The role of MRI in patients suspected of having …
What is the role of MRI in the evaluation of scaphoid fractures? The role of MRI in the evaluation of scaphoid fractures is not only for the detection of radiographically occult fractures as in other carpal bones, but also for the diagnosis of osteonecrosis of the proximal pole of the scaphoid bone. The latter entity …
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What are the MRI findings of fractures? MRI is an accurate technique for the identification of fractures in the wrist and hand, even when radiographic findings are normal. On fat-sensitive sequences (e.g., T1-weighted or PD-weighted images), fractures are seen as low signal intensity linear foci with surrounding low signal intensity edema. On fluid-sensitive sequences (e.g., …
What is the role of MR arthrography for evaluation of wrist ligamentous injuries? In some cases of ligamentous injury, the ligament may appear thinned rather than discontinuous and there may be no joint fluid present to highlight the defect. In addition, although tears of the mechanically insignificant proximal segment are generally well seen, tears of …
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What is the MRI appearance of tears of the scapholunate and lunotriquetral ligaments? Tears of these ligaments can be seen as either the absence of the ligament or as the presence of high signal intensity fluid traversing the full thickness of the ligament on T2-weighted images. The characteristic volar or dorsal angulation of the lunate …
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What is the MRI appearance of tendon degeneration, tendon tear, and tenosynovitis? Degeneration of a tendon is seen as increased signal intensity within the normally low signal intensity tendon and either enlargement or attenuation of the tendon in cross-section. A full-thickness tear is seen as a discontinuity of the tendon with variable degree of separation …
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