X4 Gutera ivi bikoreshwa mugukuraho ibibazo byumurwayi bijyanye n ivi ryimikorere cyangwa ihindagurika, usibye kubarwayi bafite ubuzima bubi buterwa nububabare bujyanye na arthrosis.Amavi apfukamye agizwe nibice bikurikira;ibice byigitsina gore, shyiramo, ibice bya tibial, uruti, pegs, nuts, ibice bya patellar.