I claim the ornamental design for a compression elbow sleeve, as shown and described.
FIG. 1 is a right perspective view of the compression elbow sleeve;
FIG. 2 is a rear perspective view of the compression elbow sleeve;
FIG. 3 is a front perspective view of the compression elbow sleeve; and,
FIG. 4 is a left perspective view of the compression elbow sleeve.
The article features shown in broken lines in the drawings at opposite ends of the compression elbow sleeve represent article boundaries and stitching, and form no part of the claimed design. Broken lines beyond the boundaries of the compression elbow sleeve represent portions of the wearer's arm and likewise form no part of the claimed design, Broken lines appearing between opposite ends of the compression elbow sleeve represent fabric patterns within the article that form a part of the claimed design. The gray and black shading in the drawings indicates a contrast in appearance.