Exoskeleton sub-assembly and exoskeleton structure including such a sub-assembly

An exoskeleton subassembly comprising:

• a leg portion adapted to be attached to a leg of a user, and
• a foot portion adapted to be attached to a shoe of the user,
• wherein the leg portion comprises a tibial segment extending below a knee, along a tibia of the user, when the leg portion is attached to the leg, the tibial segment comprising a first part, a second part connected to the foot portion, and a first joint connecting the second part to the first part, the first joint allowing a rotation of the second part relative to the first part caused by an internal/external rotational movement of a foot of the user relative to the leg, and
• wherein the foot portion comprises an intermediate part connected to the second part of the leg portion, an attachment part adapted to be fastened to the shoe of the user and a third joint connecting the intermediate part to the attachment part, the third joint allowing a rotation of the attachment part relative to the intermediate part caused by an eversion/inversion movement of the foot of the user relative to the leg, and
• wherein the third joint is disposed at a rear of the shoe of the user, behind a heel, when the leg portion is attached to the leg of the user and the foot portion is attached to the shoe of the user.