Joint preservation surgery in grade 2 and 3 giant cell tumors of bone around the knee Saurabh Singh, Alok Rai, R Dinesh Iyer, Rishabh Surana and Divyansh Sharma SICOT-J, 7 (2021) 49 Published online: 14 September 2021 DOI: 10.1051/sicotj/2021049