Microfracture with or without collagen scaffold insertion for adults with chondral or osteochondral defects of the knee: the SISMIC RCT and its challenges during and after the COVID-19 pandemic. - Whitehouse MR; Howells N; Dabner L; Thirard R; Culliford L; Marques E; Baji P; Judge A; Blom AW; Burston A; Jameson C; Rogers CA (Health technology assessment (Winchester, England), 2025)