A protective sleeve for treating injury to a wearer's elbow joint comprises a central pad； a protective opening one wearer's medial elbow region, a cap attached on the exterior side of the central pad； a relatively thin sheet； a cylindrical sleeve formed by the relatively thin sheet and the central pad； a first compression strip attached on the interior side within the upper portion of the central pad； a second compression strip attached on the interior side within the lower portion of the central pad； and a fastening means for securing the protective sleeve on the wearer's arm； and a treatment method thereof.
