Scientists warned osteoporosis patients on Thursday to avoid two common procedures used to shore up painful fractures in crumbling spines.

The treatments, which involve injecting bone cement into broken vertebrae, relieve pain no better than a placebo does, according to an expert task force convened by the American Society for Bone and Mineral Research.

The task force noted that the pain goes away or diminishes within six weeks without the procedure. Patients should take painkillers instead, the experts said, and maybe try back braces and physical therapy.

Patients also should take osteoporosis drugs to slow bone loss, said Dr. Peter Ebeling, head of the department of medicine at Monash University in Australia and lead author of the new report, which was published in the Journal of Bone and Mineral Research.