Original sentence: Control group patients received facet injections--a procedure which has independently been found effective at providing pain relief.Measured on a 0 to 10 scale, the studies found that patients with vertebroplasties performed had reductions in pain of 2.3 and 3.0 points in the two studies, compared to reductions of 1.7 and 2.6 from facet injections.Patients who received the vertebroplasty procedure had greater reductions in pain, but not at a statistically significant level.Some doctors have questioned the conclusions from these studies.The only two randomized controlled studies done to assess vertebroplasty failed to demonstrate any benefit of vertebroplasty as compared to patients who received a sham procedure.These results also cast doubt upon the benefit of kyphoplasty as no similar randomized controlled studies have been completed for this procedure
Edited sentence: The failure of placebo controlled trials to demonstrate any efficacy for vertebroplasty casts doubt on the benefit of kyphoplasty for which placebo controlled studies have not been performed