Domestic vertebral internal fixation system for treating lumbar spondylolisthesis in 55 cases A follow-up study / 中国组织工程研究

ABSTRACT

A total of 64 patients with lumbar spondylolisthesis were enrolled from Department of Bone Surgery in the People's Hospital of Haian Province between January 2002 and December 2007, including 19 males and 45 females. They aged 26-73 years with a mean of 48.5 years. Their disease course was 1-15 years with a mean of 4 years. All patients complained about the repeated low back pain accompanied with lower limb radiating pain and intermittent claudication (50-300 m). Fifty-nine patients suffered from lumbar spondylolysis, including L3 Ⅰ degree in 3 cases, L4 Ⅰ degree in 31 cases,L4, Ⅱ degree in 13 cases, Ls Ⅰdegree in 9 cases and L5 Ⅱ degree in 3 cases. The remaining 5 cases were present with lumbar degenerative pseudo-spondylolysis. All patients were processed into whole laminectomy for decompression or vertebral canal decompression by fenestration, domestic vertebral internal fixation, reduction and interbody fusion. Fifty-five patients were followed up for an average of 3.1 years whereas 9 patients were lost. According to Steffee clinical effect grading, the curative effect was evaluated as excellent in 28 cases and good in 19 cases, the rate of excellence and good accounted for 85.5%. Within one week following bone graft, all patients were rechecked with X-ray plain film, 28 of them had shown complete reduction and 36 cases were present with part reduction. The fusion rate of interbody graft was 100%. These findings demonstrated that vertebral internal fixation system possesses a simple structure, convenient operation and solid fixation, resets the slipped vertebral body and significantly increases the fusion rate of vertebral graft.