Thirteen wrists, including hands from nine Japanese cadavers, were obtained for this study. All cadavers were donated to the Department of Anatomy of the Tokyo Medical and Dental University. The study design was approved by the Ethics Committee at our institution.
We fixed all cadavers in 8% formalin and preserved them in 30% ethanol. Specimens with remarkable deformation around the distal radioulnar joint or remarkable instability of the distal radioulnar joint were excluded. We sectioned all specimens to obtain the wrist using a diamond band pathology saw (EXAKT 312; EXAKTAdvanced Technologies). We obtained three‐dimensional images of the 13 wrist blocks using a micro‐computed tomography (micro‐CT) scanner (inspeXio SMX‐100 CT; SHIMADZU) and application software (VGStudio Max 2.0). The micro‐CT parameters were as follows: voltage 100 kV, current 80 µA current, source‐to‐detector distance 700 mm, source‐to‐rotation center distance 500 mm, pitch 0.179, slice thickness 0.200 mm, field of view (xy) 91.55 mm, field of view (z) 45.0 mm, matrix 512 x 512, voxel size 0.179 mm/voxel. After obtaining three‐dimensional images, one specimen was found to have severe calcification on the distal ulna. Therefore, we used 12 specimens (three right and nine left) from nine cadavers (two males and seven females; average age, 83.6 years; age range, 49–96 years) for the analyses.
We fixed all cadavers in 8% formalin and preserved them in 30% ethanol. Specimens with remarkable deformation around the distal radioulnar joint or remarkable instability of the distal radioulnar joint were excluded. We sectioned all specimens to obtain the wrist using a diamond band pathology saw (EXAKT 312; EXAKTAdvanced Technologies). We obtained three‐dimensional images of the 13 wrist blocks using a micro‐computed tomography (micro‐CT) scanner (inspeXio SMX‐100 CT; SHIMADZU) and application software (VGStudio Max 2.0). The micro‐CT parameters were as follows: voltage 100 kV, current 80 µA current, source‐to‐detector distance 700 mm, source‐to‐rotation center distance 500 mm, pitch 0.179, slice thickness 0.200 mm, field of view (xy) 91.55 mm, field of view (z) 45.0 mm, matrix 512 x 512, voxel size 0.179 mm/voxel. After obtaining three‐dimensional images, one specimen was found to have severe calcification on the distal ulna. Therefore, we used 12 specimens (three right and nine left) from nine cadavers (two males and seven females; average age, 83.6 years; age range, 49–96 years) for the analyses.