Results of Expansive Laminoplasty for Lumbar Spinal Stenosis in Active Manual WorkersMATSUI, HISAO, MD; TSUJI, HARUO, MD; SEKIDO, HIROMICHI, MD; HIRANO, NORIKAZU, MD; KATOH, YOSHIHARU, MD; MAKIYAMA, NAOYA, MDSpine: March 1992 - Volume 17 - Issue - p 37–40 ORIGINAL ARTICLE: PDF Only Free Abstract Author InformationAuthors Expansive laminoplasty was done on 18 selected patients with lumbar spinal canal stenosis who were active manual workers and 2 patients with cauda equina tumors from 1982 to 1990. Postoperative follow-up on the lnitial 10 cases of spinal stenosis was 1–7 years (mean, 3 years). Using computed tomography, the spinal canal was found to be enlarged with a nearly rectangular shape, and the mean percent eniargement was 119% (1.9 cm2). Spinal stability also was reinforced. The preoperative mean evaluation score (Japanese Orthopaedic Association score) was 10.4 (full scale, 29). The mean score improved to 24 postoperatively (mean percent improvement, 73%). These findings did not change during the long follow-up, and the satisfactory results were maintained. Depatment of Orthopadic Surgery, Faculty of Medicine, Toyama Medical and Pharmachutical University, Toyama, Japan © Lippincott-Raven Publishers.