Disclosed is a lower limb (1) of an ambulatory exoskeleton (2) comprising at least one pelvis segment (10) to which at least one first leg segment (20) (Ps) is articulated, the lower limb (1) of the exoskeleton (2) comprising a first joint blocker comprising: - a first element (51) provided with means for connecting it functionally in rotation to the first leg segment (20); - a first pad (30); - a first actuator (33) that is able to selectively assume a first free state in which the rotation of the first element (51) in a first direction (S1) and the rotation of the first element (51) in a second direction opposite the first direction is free and a second blocking state in which the rotation of the first element (51) in the first direction is blocked by abutment of the first element (51) on the first pad (30).
LOWER LIMB OF AN EXOSKELETON