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Fig. 2B —13-year-old girl with osteoid osteoma of femur. Axial CT images show posterolateral cortical thickening and nidus with faint mineralization (arrow, B) with placement of 5-mm electrode into nidus (C). This was first case of radiofrequency ablation for osteoid osteoma performed at our institution. Seminal articles on subject at time described off-label use of 0.5-cm probe, although using different ablation parameters. Manufacturer offered to provide technical assistance only if we used 1-cm probe and different generator that, at that time, were not as well described in literature. Is this experimentation, innovation, or standard practice? What are implications for informed consent?