A shoulder orthosis for stabilizing the shoulder of a human patient, comprising: - an arm brace for attachment to an arm of the patient such that the arm brace at least partially surrounds the patient's upper arm when the shoulder orthosis is worn, - a shoulder brace for attachment to a shoulder of the patient such that the shoulder brace at least partially covers the patient's shoulder when the shoulder orthosis is worn, and - a pulley system connecting the arm brace to the shoulder brace via a deflected pull cord, wherein the pulley system comprises at least one cord deflection member and at least one cord tensioning member, the pull cord extending on both sides of the cord deflection member with two pull cord portions and having a tensile effect, and the pull cord being adjustable in its length having a tensile effect with the cord tensioning member such that the positioning of the arm brace relative to the shoulder brace is adjustable, wherein the cord deflection member is fastened to the shoulder brace such that when the shoulder orthosis is worn, the cord deflection member is arranged on the patient's shoulder, wherein - at least one further cord deflection member (36, 38) is attached to the arm brace, the pull cord passing through the at least one further cord deflection member (36, 38) starting from the shoulder brace such that a further pull cord portion connects the arm brace to the shoulder brace via the at least one further cord deflection member (36, 38), characterized in that - the at least one further cord deflection member (36, 38) arranged on the arm brace can be removed from the arm brace without being damaged, or that the pull cord can be disengaged from the at least one further cord deflection member (36, 38) arranged on the arm brace. - an arm brace for attachment to an arm of the patient such that the arm brace at least partially surrounds the patient's upper arm when the shoulder orthosis is worn, - a shoulder brace for attachment to a shoulder of the patient such that the shoulder brace at least partially covers the patient's shoulder when the shoulder orthosis is worn, and - a pulley system connecting the arm brace to the shoulder brace via a deflected pull cord, wherein the pulley system comprises at least one cord deflection member and at least one cord tensioning member, the pull cord extending on both sides of the cord deflection member with two pull cord portions and having a tensile effect, and the pull cord being adjustable in its length having a tensile effect with the cord tensioning member such that the positioning of the arm brace relative to the shoulder brace is adjustable, wherein the cord deflection member is fastened to the shoulder brace such that when the shoulder orthosis is worn, the cord deflection member is arranged on the patient's shoulder, wherein - at least one further cord deflection member (36, 38) is attached to the arm brace, the pull cord passing through the at least one further cord deflection member (36, 38) starting from the shoulder brace such that a further pull cord portion connects the arm brace to the shoulder brace via the at least one further cord deflection member (36, 38), characterized in that - the at least one further cord deflection member (36, 38) arranged on the arm brace can be removed from the arm brace without being damaged, - at least one further cord deflection member (36, 38) is attached to the arm brace, the pull cord passing through the at least one further cord deflection member (36, 38) starting from the shoulder brace such that a further pull cord portion connects the arm brace to the shoulder brace via the at least one further cord deflection member (36, 38), characterized in that - the at least one further cord deflection member (36, 38) arranged on the arm brace can be removed from the arm brace without being damaged,