Mauricio Kfuri1,2, Philipp Lobenhoffer3. 1. Department of Orthopedics, University of Missouri, Columbia, Missouri. 2. Department of Biomechanics, Medicine and Rehabilitation of Locomotor Apparatus, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil. 3. Gelenkchirurgie Orthopädie Hannover go:H, Hannover, Germany.