Original sentence: The first two rigorous (double-blind, random, placebo) studies of this popular procedure failed to validate its efficacy
Edited sentence: Evidence reveals bone cement injection has no benefit over placebo procedure for spinal compression fractures.One of the studies, funded by the National Institutes of Health, was the first of its kind to use a double-blinded research model to examine the impact of vertebroplasty.Previous research has suggested that bone cement—a permanent medical implant—may places patients at future risk for additional spinal fractures in adjacent vertebrae because it changes the way the spine is able to absorb shock.The first two rigorous (double-blind, random, placebo) studies of this popular procedure have concluded that a common repair for spinal compression fractures in people who have osteoporosis offers no more benefit than a sham injection and may carry serious risks.Two new studies, published in the New England Journal of Medicine in August 2009, raise doubts about the benefits of vertebroplasty