Chapter 7 Effectiveness of permissive weight bearing in surgically treated trauma patients with peri- and intra-articular fractures of the lower extremities: a prospective comparative multicenter cohort study Kalmet PHS Maduro CV Meys G van Horn YY Hustinx P van Vugt R Janzing H van der Veen A Jaspars C Sintenie JB Blokhuis TJ Evers SMAA Seelen HAM Brink PRG Poeze M Submitted