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| LIU Zhen,GUO Jing,ZHU Zezhang.The effect of radiographic parameters associated with the lowest instrumented vertebrae on postoperative coronal trunk balance in Lenke 5C adolescent idiopathic scoliosis[J].Chinese Journal of Spine and Spinal Cord,2013,(12):1063-1067. |
| The effect of radiographic parameters associated with the lowest instrumented vertebrae on postoperative coronal trunk balance in Lenke 5C adolescent idiopathic scoliosis |
| Received:January 14, 2013 Revised:July 02, 2013 |
| English Keywords:Idiopathic scoliosis Type Lenke 5 curve Coronal trunk balance Lowest instrumented vertebrae |
| Fund:国家自然科学基金（编号：81171767） |
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| English Abstract: |
| 【Abstract】 Objectives: To investigate the long-term effect of radiographic parameters associated with the lowest instrumented vertebrae(LIV) on postoperative coronal trunk balance in adolescent idiopathic scoliosis(AIS) patients with type Lenke 5 curve. Methods: In this retrospective study, totally 30 AIS patients with type Lenke 5 curve who received posterior selective fusion were included. Pre- and postoperative standing upright posteroanterior and lateral radiographs as well as preoperative supine left and right side-bending radiographs were used for radiographic assessment. Bivariate correlation tests were carried on to analyze the correlation of each radiographic parameter related to the LIV and the coronal trunk balance immediately after surgery and at final follow-up. Results: The average follow-up time was 33 months(range 24-50 months). The LIV was L3(n=20) or L4(n=10). The average preoperative Cobb angle of the TL/L curve and thoracic curve was 49.8°±5.1° and 25.6°±7.1°, respectively. Correlation analysis showed that the following radiographic parameters were significantly associated with the immediate postoperative coronal trunk balance(CTB): preoperative coronal trunk balance(r=0.69, r2=0.48, P<0.01), preoperative LIV tilt(r=0.63, r2=0.40, P<0.01), and postoperative LIV tilt(r=0.60, r2=0.36, P<0.01). However, at final follow-up, neither preoperative nor postoperative parameters were associated with the final coronal trunk balance(P>0.05). Conclusions: In AIS patients with type Lenke 5 curve, preoperative coronal trunk balance and preoperative LIV tilt are very important parameters in predicting the immediate postoperative coronal trunk balance. Preoperative LIV tilt ≥25° is associated with a high risk of developing immediate postoperative coronal imbalance. During the follow-up, no radiographic parameters at either preoperation or postoperation have statistical correlation with the final coronal trunk balance. |
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