Tumors of the patella: the experience of Institute of Orthopedics and Traumatology at University of São Paulo, Brazil - Baptista, André Mathias; Sargentini, Sylvio Cesar; Zumárraga, Juan Pablo; Camargo, André Ferrari de França; Camargo, Olavo Pires de (Acta Ortopédica Brasileira, 2016)