a system for treating an abnormal vertebral body such as a compression fracture . in an exemplary embodiment , the system includes a biocompatible flow - through implant structure configured with a three - dimensional interior web that defines flow openings therein for cooperating with a two - part hardenable bone cement . the flow - through structure is capable of compacted and extended shapes and in one embodiment provides a gradient in flow openings for controlling flow parameters of a bone cement injected under high pressure into the interior thereof . the flow - through implant structure is configured for transducing cement injection forces into a selected direction for moving apart cortical endplates of a vertebra to reduce a fracture . in one embodiment , the flow - through implant structure is coupled to an rf source for applying rf energy to a two - part bone cement to accelerate curing of the cement to thereby allow on - demand alterations of cement viscosity . the rf system allows for control of bone cement polymerization globally or regionally to prevent cement extravasion and to direct forces applied to a vertebra to reduce a fracture .