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case_images: Lateral (A) and posteroanterior (B) radiographs of right wrist joint demonstrating proximal pole sclerosis of scaphoid.
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case_images: Interval radiographs and computerized tomography (CT) were suggestive of arthritis and sclerosis at the proximal pole of the scaphoid (Figure 1). The scapholunate (SL) and lunotriquetral (LT) joint spaces were not altered (Figure 1).
case_images: Axial (a), sagittal (B), and coronal (C) CT of right wrist. Subchondral crescent sign on scaphoid (black arrows) present.
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case_images: In retrospect, a CT scan revealed a subchondral crescent sign on the scaphoid, suggesting impending articular collapse due to osteonecrosis (Figure 2).
case_images: MRI of right wrist joint showing diffused altered marrow signal (white arrows) of the proximal scaphoid.
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case_images: Magnetic resonance imaging (MRI) and repeat radiographs demonstrated diffused altered marrow signals in the scaphoid, which were suggestive of AVN (Figures 3 and 4).
case_images: Plain radiographs of the right wrist joint demonstrating progressive wrist degeneration and scaphoid sclerosis/fragmentation with narrowing of the radiocarpal joint. A & B: Posteroanterior view. C: Lateral view.
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case_images: Magnetic resonance imaging (MRI) and repeat radiographs demonstrated diffused altered marrow signals in the scaphoid, which were suggestive of AVN (Figures 3 and 4).
case_images: A: Postoperative radiograph of right wrist joint. B: Intraoperative image showing excision of proximal carpal bones. C: Scaphoid with flattened and collapsed proximal pole.
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case_images: The scaphoid was excised en-bloc and was collapsed and flattened proximally with evidence of fragmentation, but no fracture (Figure 5).
case_images: Regions of avascular necrosis underlying cancellous bone of right scaphoid. Reference of 5 mm.
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case_images: Cross-section histological analysis of the scaphoid demonstrated diffuse AVN, suggestive of Preiser's disease (Figures 6 and 7).
case_images: Avascular necrosis of the trabeculae. The articular cartilage of the scaphoid is intact, dismissing osteoarthritic processes as a contributor to bony degeneration. Reference of 1 mm.
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case_images: Cross-section histological analysis of the scaphoid demonstrated diffuse AVN, suggestive of Preiser's disease (Figures 6 and 7).
case_images: Right resected scaphoid bone with area of fat necrosis with and without calcification, acellular cancellous bone, and marrow fibrosis at the proximal end of the scaphoid. Reference of 200 microm.
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case_images: These findings were supported by intramedullary fat necrosis of the bone with resulting acellular bone trabeculae (Figure 8). Histology further examined the cross sections of the scaphoid bone and discovered the presence of marrow fibrosis (Figure 8).