Abstract : In Situ Cartilage Repair In article 2201588 by Xiong Shu, Sujun Wu, Juan Guan, Juan Guan, and co‐workers, a cell‐free silk protein sponge is fitted on site of a cartilage defect. The in situ cartilage repair is assisted by programmed factors E7 and TGF‐ β 1, that trigger serial events of autologous stem cell homing, directed differentiation and chondrocyte proliferation.