Correction to: Is debridement beneficial for focal cartilage defects of the knee: data from the German Cartilage Registry (KnorpelRegister DGOU) - Manuel Weißenberger; Tizian Heinz; Sebastian P. Boelch; Philipp Niemeyer; Maximilian Rudert; Thomas Barthel; Stephan Reppenhagen (Archives of Orthopaedic and Trauma Surgery, 2021)