The ornamental design for an orthosis, as shown and described.
FIG. 1 is a front elevation view of an orthosis;
FIG. 2 is a left side elevation view of the orthosis;
FIG. 3 is a rear elevation view of the orthosis;
FIG. 4 is a right side elevation view of the orthosis;
FIG. 5 is a top side view of the orthosis;
FIG. 6 is an isometrical view of the orthosis; and,
FIG. 7 is an isometric view of a second embodiment of the orthosis of FIGS. 1–6, it being understood that all surfaces are the same as those of the first embodiment, the only difference being that the disclaimed wedge portion.
The broken lines in FIG. 7 showing a wedge portion illustrate environmental structure and form no part of the claimed design.