The purpose of this study was to evaluate the intraosseous use of a flexible endoscope during core decompression in identifying avascular bone in the femoral head that did not meet magnetic resonance imaging diagnostic criteria for osteonecrosis. The flexible endoscope was used to visually examine and locate avascular bone in the entire core track. A high-speed burr was then used to debride the...

This retrospective study describes the long-term results of core decompression and placement of a non-vascularised bone graft in the management of avascular necrosis of the femoral head. We treated 80 hips in 65 patients, 18 by a cortical tibial autograft and 62 by a fibular allograft. The mean age of the patients was 36 years (SD 13.2). A total of 78 hips were available for evaluation of which...

A compression/decompression scheme based on statistical coding is presented for reducing the amount of test data that must be stored on a tester and transferred to each core in a core-based design. The test vectors provided by the core vendor are stored in compressed form in the tester memory and transferred to the chip where they are decompressed and applied to the core. Given the set of test ...