A medical compression / containment orthosis of the lower limb in the form of a sock, stocking or pantyhose, comprising this orthosis (10): - an elastic compressive distal part (14), capable of covering the ankle extending until before the beginning of the twin , at the level of the point of attachment between the Achilles tendon and the twin muscles, with this distal part made by weaving a knitting lime and a weft thread, choosing the dimensioning and the nature of the knitting threads and weft as well as the mesh structure to exert in the circumferential direction, after the placement of the orthosis on the member, an elastic return force intended to produce a compression of the member at a desired therapeutic pressure level； and - a contentive proximal part (16) that extends the compressive and adjacent distal part, which extends the compressive distal part on its circumference and that envelops an entire area of the twin included, in a vertical direction, between the level (B1) of the junction point between the Achilles tendon and the twin muscles and the level (D) located below the tibial tuberosity； this proximal part containing a deformable tubular part being woven in continuity with the elastic compressive distal part, this orthosis being characterized in that the contentive proximal part: - is essentially non-elastic, and - incorporates a hardened biocompatible resin.Una órtesis de compresión/contención médica del miembro inferior en forma de calcetín, de media o de panti, comprendiendo esta órtesis (10): - una parte distal compresiva (14) elástica, capaz de cubrir el tobillo extendiéndose hasta antes del inicio del gemelo, al nivel del punto de unión entre el tendón de Aquiles y los músculos del gemelo, con esta parte distal realizada mediante tejido de un tilo de tejer y de un hilo de trama, eligiéndose el dimensionamiento y la naturaleza de los hilos de tejer y de trama así como la estructura de malla para ejercer en dirección circunferencial, después de
