Stiffness after unicompartmental knee arthroplasty: Risk factors and arthroscopic treatment Gaspard Fournier, Romain Gaillard, John Swan, Cécile Batailler, Sébastien Lustig and Elvire Servien SICOT-J, 7 (2021) 35 Published online: 19 May 2021 DOI: 10.1051/sicotj/2021034