• Junlin Yang, Zifang Huang, Michael Grevitt, Jun Li, Fobao Li, and Jingfan Yang.
• *Department of Orthopedic Surgery, The 1st Affiliated Hospital of Sun Yat-Sen University, Zhongshan Er road, Guangzhou, Guangdong, China †Department of Anatomy, Southern Medical University, Guangzhou,Guangdong, China ‡Centre for Spinal Studies and Surgery, D Floor, West Block, Queens Medical Centre, Derby Road, Nottingham, UK §Department of Orthopedic Surgery, Panyu Central Hospital, Guangzhou, Guangdong, China.
• J Spinal Disord Tech. 2013 Nov 7.

Study Design:Report of a new technique.Objective:Introduce a new method of precise correction controlling for ankylosing spondylitis kyphosis.Summary Of Background Data:The exact angel method is excellent for calculating PSO angle, but difficult to perform during operation. In this study, Precise Rod Bending Technique as a new method of precise correction controlling for ankylosing spondylitis kyphosis was proposed via illustrative cases.Methods:A preoperative plan with exact osteotomy angle and level was done in the whole spine lateral X-film by exact angle method, then a precise contoured rod imitating the predicted spine correction was obtained in lateral spine X-film with actual size of trunk. At last, we disinfected this rod model and used it for controlling kyphosis correction precisely in ankylosing spondylitis patients with good cervical spine and hip joints.Results:Four Ankylosing spondylitis kyphosis patients were successfully corrected by precise bending rod technique, their mean age was 31 year-old, mean operative time was 247 mins (160∼320 mins), mean bleeding was 1482 ml (727ml∼2700ml), the average follow-up was 13.8 months (9∼17 months), all patients reestablished sagittal balance (all C7-SSVL≤2 cm), the predicted ostetomy degree was accurate to within 2° compared to the achieved degree at the osteotomy site, there were no any complications occurred during or after surgery.Conclusion:Precise rod bending technique is a simple, effective method for exact correction of kyphosis caused by ankylosing spondylitis. The surgical result was corresponded with the preoperative planning.

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