The ornamental design for an arm brace with abductorpillow, as shown and described.
FIG. 1 is a top-rear-left isometric view of an arm brace with abductor pillow, showing my design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a rear elevational view thereof; and,
FIG. 7 is a front elevational view thereof.
The broken line showing in the Figures shows portions of the arm brace with abductor pillow and forms no part of the claimed design. The break lines in the strap of the arm brace with abductor pillow shown in the Figures indicate indeterminate length.