Clinical study on posterior paraspinal approach in removing of pedical screw fixation

FENG Yu-min; ZHANG Wei-dong

Abstract：Objective:To investigate the applications of paraspinal muscle approach in removing pedicle screw fixation. Methods:Clinical materials of 63 patients who had pedicle screw removing,were collected from January 2007 to August 2013. Paraspinal muscles approach group included 33 patients who received operations with paraspinal muscles approach. Convention-al posterior midline approach group included 30 patients who received operations with conventional posterior midline approach. Mean-operative time,mean-blood loss,postoperative 24 h visual analog pain scale in digital scale( VAS)and hospital stays were compared between two group. Results:All patients were complete removal of pedicle screw system,no significant compli-cations. In paraspinal muscles approach group,mean operative time was(38. 1 ± 5. 8)min;mean blood loss was(52. 4 ± 7. 8) mL;24 h VAS scale and 72 h VAS scale were(2. 5 ± 0. 3)score and(0. 6 ± 0. 1)score,hospital stays was(4. 0 ± 0. 5)d. In conventional posterior midline approach group ,mean operative time was( 7 6 . 0 ± 8 . 8 )min;mean blood loss was( 1 8 6 . 1 ± 25 . 4 )mL;2 4 h VAS scale and 7 2 h VAS scale were( 7 . 4 ± 0 . 4 )score and( 2 . 4 ± 0 . 2 )score ,hospital stays was( 9 . 1 ± 1. 8)d. There were significant differences in mean operation time,mean blood loss,postoperative 24 h VAS and hospital stays between two groups(P﹤0. 05). Paraspinal muscles approach group was better than conventional posterior midline approach group. Conclusion:Paraspinal muscleapproach for removing pedical screw fixation shows less mean operation time,less bleed-ing. It provides a safe,effective,minimally invasive surgical option.