Abstract: The present invention relates to a device for protecting a user's knee joint, the device being for installing on a sports boot (2) and being characterized in that it comprises a shell (10) provided with an inside surface suitable for covering at least in part an anterior portion of the user's leg, the shell (10) having a top portion (11) for situating at knee level and a bottom portion (12) including connection means suitable for connecting the shell (10) to the sports boot (2), the top portion including side cheeks suitable for being put into contact with the knee on either side of the knee, and coming into contact at least with the condyles of the user's femur, at least one strap (3) for attaching around a zone of the leg and attachment means for attaching the strap (3) to the inside surface of the shell (10).

Abstract: A device for protecting the knee joint of a skier, the device being for installing on a ski boot having a footwear portion surmounted by a collar, the device having first connector designed to be fastened to the collar of the boot and a shell designed to cover the front of the tibia of the skier, the shell extending between a high portion for being situated level with the skier's knee and a low portion covering a portion of the collar of the boot, the shell supporting, on its high portion, lateral flanges suitable for being put into contact with the knee on either side of the knee being in contact at least with the condyles of the femur of the skier.