An Innovative System to Facilitate Extension Osteotomy in the Prone Position for Chin-on-Chest Deformity of Ankylosing Spondylitis

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Figure 1
Critical issue with conventional positioning equipment. (A) Venous congestion due to fixed position of the head. (B) Reverse Trendelenburg capability of standard operating table insufficient to mitigate congestion.
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Figure 2
Advanced Deformity Adjustable Proning Tool (ADAPT). (a) Interchangeable rigid top components. (b) Polyethylene body (13° incline). (c) Incremental wedges for additional incline (10° each).
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Figure 3
Patients' (A) preoperative and (B) postoperative spines.
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Figure 4
Positioning device design process. (A) 3-dimensional topographical reconstruction and positioning device model. (B) Manufactured device with Relton-Hall blocks attached.
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Figure 5
Positioning system configuration. (A) Patient positioned prone on positioning equipment. (B) Schematic illustration: (i) Mayfield frame, (ii) ADAPT device, (iii) Relton-Hall supports, (iv) Tarlov seat, (v) supporting strap, and (vi) gel and foam support to protect and immobilize knees.