Abstract: An orthotic device for a lower limb, comprising a one-foot support, a vertical rod, a cuff for fixing the orthotic device on the calf, the one-foot support being linked to one end of the vertical rod and the cuff being linked to the vertical rod opposite end. The orthotic device is such that the one-foot support is connected to the vertical rod end via a flexible cylindrical sleeve enabling the one-foot support to rotate horizontally with respect to the vertical rod and to rotate vertically with respect to the vertical rod and it comprises a cylindrical ring urged to be interlocked on the elastic sleeve to block the one-foot support vertical rotation relative to the vertical rod without blocking the one-foot support horizontal rotation relative to the vertical rod. The invention is applicable to an orthotic device enabling the user to walk while providing complete freedom to the foot.