I claim the ornamental design for a compression elbow sleeve, as shown and described.
FIG. 1 is a perspective view of a compression elbow sleeve;
FIG. 2 is a front view of the compression elbow sleeve;
FIG. 3 is a rear view of the compression elbow sleeve;
FIG. 4 is a left side view of the compression elbow sleeve; and,
FIG. 5 is a right side view of the compression elbow sleeve.
In FIG. 1, the broken line showing of a human arm is for the purpose of showing environment which forms no part of the claim. The broken line showing on the compression elbow sleeve is for the purpose of illustrating portions of the sleeve which form no part of the claim. The patterns on the sleeve represent claimed yarn and thread contrast.