Pain at the dominant wrist. No history of trauma.
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Diffusely decreased signal intensity is present within the lunate bone on the T1W images and heterogeneously increased signal on T2W images (Stage II Kienbock disease). There is slight loss of lunate height as well, predominantly on its radial side. No scapholunate dissociation.
Negative ulnar variance with compensatory thickening of the triangular fibrocartilage is also present.
Small wrist joint effusion is noted.
Unremarkable flexor and extensor tendons.
- sclerosis (low T1 and T2) centrally and within the radial aspect of lunate
- bone edema (high T2, intermediate T1) may be seen in the acute phase, particularly on the radial side
- 75% of cases are associated with negative ulnar variance