Cells taken from the upper thigh and injected into the sphincter muscle may help ease urinary incontinence in patients who haven't responded to normal treatment, a new study suggests. Researchers injected the muscle cells into the bladder of 29 women and found that three-fourths of the participants had less incontinence one year later. As follow up, 86 percent of the women volunteered to have another injection three months after the first. Experts say that muscle cells may send signals that...