Fig. 2From: A novel technique of transpedicular opening-wedge osteotomy for treatment of rigid kyphosis in patients with ankylosing spondylitisa The osteotome is made up of the main part with a depth-restricting device and an inner nail. The width is 8 mm, and the thickness is 4 mm. b After the nail is inserted into the osteotome, the top of the nail can protrude from the osteotomeBack to article page