To analyze the effectiveness of posterior pedicle screw system combined with interbodyfusion in treating lumbar spondylol isthesis. Methods Between January 2005 and January 2009, 26 patients with lumbar spondylol isthesis underwent posterior pedicle screw system combined with interbody fusion, including 11 males and 15 females with an average age of 56.8 years (range, 36-73 years). The disease duration was 7 months to 11 years. The affected lumbars were L3 in 3 cases, L4 in 12 cases, and L5 in 11 cases. According to the Meyerding evaluating system, 21 cases were classified as degree III, 5 cases as degree III-IV, and 1 case as degree IV. The cl inical results were investigated by measuring radiographic measurements, including Taillard index, Boxall index, sl i pping angle, lumbar lordosis angle,
and intervertebral height index preoperatively, immediately, 2 weeks and 3 months postoperatively, respectively. SUK’
s criteria was used to judge bone graft fusion. Results Primary heal ing of the incisions was achieved in all cases. All
patients were followed up 25.8 months on average (range, 10-51 months). There were significant differences in Taillard
index, Boxall index, sl i pping angle, lumbar lordosis angle, and intervertebral height index between preoperatively and
immediately, 2 weeks, 3 months after operation (P lt; 0.05). Bone graft fusion was achieved at 3-8 months after operation
(mean, 3.5 months); and the fusion rate was 100%. According to Japanese Orthopedic Association (JOA) scoring, the
results were excellent in 17 cases, good in 7 cases, fair in 1 case, and poor in 1 case; and the excellent and good rate was 92.3%. Compl ications occurred in 2 cases, including nail or rod breakage and nerve injury, and they were cured after
treatment. Conclusion Posterior pedicle screw system combined with interbody fusion treating lumbar vertebral
spondylol isthesis can afford sol id internal fixation and achieve a satisfactory reduction, so it maybe an ideal procedure and a worthy recommended method for treating lumbar spondylol isthesis.
Citation： MENG Chunyang,TANG Ke,OU Yunsheng,QUAN Zhengxue,ZHANG Weihong,LI Qingwei,KONG Xiangqing. EFFECTIVENESS OF POSTERIOR PEDICLE SCREW SYSTEM COMBINED WITH INTERBODY FUSION IN TREATING LUMBAR SPONDYLOLISTHESIS. Chinese Journal of Reparative and Reconstructive Surgery, 2010, 24(8): 904-907. doi: Copy
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