Changes of Bone Mineral Content of Femoral Neck caused by Postoperative Bed Rest after Lumbar Spinal Surgery. Measured by Dual Energy X-ray Absorptiometry.:Measured by Dual Energy X-ray Absorptiometry

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We measured bone mineral density (BMD) of the femoral neck before and after lumbar spinal surgery by dual energy X-ray absorptiometry (DXA) to investigate the effect of postoperative bed rest on bone mineral content (BMC).The study involved 7 males and 3 female patients ranging in age from 43 to 73 years, average age 54 years. Disorders comprised 4 lumbar spinal canal stenosis, 3 lumar spondylolytic spondylolisthesis, and one case each of lumbar degenerative spondylolisthesis, lumbar disc herniation and spinal arachnoid cyst. The period of postoperative bed rest ranged from 23 to 35 days (mean 27 days).BMDs of femoral neck, Wards triangle, and trochanter decreased 1 month after surgery but were not significant. After reambulation, they demonstrated positive slopes but had not recovered completely by 3 months after surgery.Postoperative bed rest for 1 month adds to loss in BMD. Once the BMC had decreased, it was difficult to recover to the preoperative level at follow-up 2 months after reambulation.
西日本整形・災害外科学会の論文