1 23 European Journal of Trauma and Emergency Surgery Official Publication of the European Society for Trauma and Emergency Surgery Incorporating the International Journal of Disaster Medicine ISSN 1863-9933 Eur J Trauma Emerg Surg DOI 10.1007/s00068-011-0165-7 Radiation exposure during 3D fluoroscopy of the knee: an experimental study T. Tharmviboonsri, K. Riansuwan, A. Nitising & B. Mahaisavariya