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Fig. 1 | Journal of Orthopaedic Surgery and Research

Fig. 1

From: Evaluation of surgical outcome of Jack vertebral dilator kyphoplasty for osteoporotic vertebral compression fracture—clinical experience of 218 cases

Fig. 1

The Jack vertebral dilator consists of a rotary hilt, a handle, and a connecting tube and the head. There are two bar stays, one proximal and the other distal in the head portion. Inside the dilator is a pull rod; and when the pull rod is drawn backward and proximally or pushed forward and distally, it opens or closes the dilator head in a parallel fashion. When the dilator head is completely closed, the proximal and distal bar stay is hid in the inner notch along the head and neck and bar stays. During Jack vertebral dilator kyphoplasty, the generation of a pull force produces vertical tension that helps restore the vertebral height. When the dilator is removed, a cavity is formed, which can be filled in with bone cerement to restore the correct spine position

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