The Result of Segmental Pedicle Screw Hook Fixation in Patients with Lumbar Spondylolysis at One-Year Follow-Up

Objective: This is a retrospective study to evaluate the clinical outcome in patients who underwent segmental pedicle screw hook fixation to repair their pars defect. Methods: Fifteen patients were included in this study (From Aug. 1997 to Aug. 2000). They all suffered from lumbar spondylolysis with either a grade 0 or less than grade 1 spondylolisthesis. The average age at the time of surgery was 22.8 (range: 19 to 26 years). They were all young males previously engaged in heavy manual labor. One surgeon performed the operation, and a follow-up was conducted on all patients for an average period of 20.4 months. Results: The clinical results were evaluated by Henderson's categories of functional capacity. The preoperative evaluation revealed ”fair” in 10 patients, ”poor” in 4 patients and ”good” in 1 patient. Postoperative evaluation revealed ”excellent” in 12 patients and ”good” in 3 patients. Sequential X-ray follow-up showed a solid fusion of the pars defects in all patients (100%) as compared to what had been observed in the preceding X-ray check-up. In nine patients, removal of the implant was requested one year after operation. The fracture was examined during implant removal, and the examination showed a large bone mass in the pars defect region, and that the spinal integrity was preserved without pseudoarthrosis. Conclusions: This technique is a simple and effective method for the direct repair of spondylolytic defects. However, it is only indicated in individuals of young age with pure spondylolysis or minor degrees of slippage.

並列關鍵字

pedicle screw hook fixation ； pseudoarthrosis ； spondylolisthesis ； spondylolysis

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