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Three-dimensional images of representative cancellous bone cores. Cancellous bone density is classified into 4 categories based on HU. Thirty of the 116 specimens were classified as having D1 bone quality (A), while 8, 21, and 57 specimens had D2 (B), D3 (C), and D4 (D) bone quality, respectively.
HU, Hounsfield units.
