1. Performance of a non-fluoroscopically assisted substitute for the Lyon schuss knee radiograph: quality and reproducibility of positioning and sensitivity to joint space narrowing in osteoarthritic knees 
S.A. Mazzuca, Ph.D., M.-P. Hellio Le Graverand, M.D., E. Vignon, M.D., D.J. Hunter, M.B.B.S., Ph.D., C.G. Jackson, M.D., V.B. Kraus, M.D., T.M. Link, M.D., T.J. Schnitzer, M.D., A. Vaz, M.D., Ph.D., H.C. Charles, Ph.D. 
Osteoarthritis and Cartilage 
Volume 16, Issue 12, Pages (December 2008)
DOI: /j.joca
Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions

2. Fig. 1
Positioning of the subject for the FF and LS radiographs and examples of parallel and skewed alignment of the MTP with the X-ray beam. Panel A illustrates schuss positioning of the subject for both examinations. The pelvis, patella and great toe are positioned coplanar with the film cassette (knee flexion≈20°). The FF protocol uses a fixed 10° caudal angulation of the X-ray beam. In the LS protocol, fluoroscopy is used to adjust the beam angle to superimpose (±1mm) the anterior and posterior margins of the MTP. An IMD≤1mm (arrow) indicates parallel radioanatomic alignment of the MTP (panel B). Panel C illustrates skewed MTP alignment signified by IMD>1mm (arrows).
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions