Objective: To determine the incidence and the amount of bony regrowth occurring at the site of laminectomy after performing decompressive surgery for lumbar spinal stenosis and to investigate the existence of possible factors that could enhance such bony regrowth and its possible influence in clinical outcome. Methods: Bone regrowth was assessed in 29 patients (mean follow-up 6,6 years) that underwent decompressive surgery due to lumbar spinal canal stenosis. Postoperative plain films were compared with plain films obtained at the last follow-up. Bone regrowth was graded relating to the percentage of new bone created at the site of the laminectomy being divided into four categories: insignificant 0-10%, mild 11-40%, moderate 41-70% and severe 71-100%. Different factors such as gender, spinal stenosis etiology, number of levels involved in surgery, degree of bony regrowth and patient clinical condition at the last follow-up were analyzed. Results: In 9 patients none or insignificant bony regrowth was observed, 18 patients were included in the mild category whereas 2 patients were included in the moderate category. No case of severe regrowth was identified. The degree of bony regrowth was found to be related with the number of levels included in the surgery and with the performance or not of spinal arthrodesis. Regarding clinical outcome those patients showing mild to moderate bone regrowth showed a worse clinical outcome than those who presented insignificant amounts of bony regrowth. Conclusions: Although the results of the present study are not statistically significant it seems that the occurrence of bony regrowth at the site of laminectomy might be a deleterious factor for clinical outcome in those patients who underwent decompressive surgery for lumbar spinal stenosis.
|Journal||Patologia del Aparato Locomotor|
|Publication status||Published - 1 Apr 2006|
- Bone regrowth
- Lumbar spinal stenosis