UCL Pronator Strain

RapidForce® Shapes are uniquely designed to provide pain relief and unprecedented mechanical support to the muscles, ligaments and tendons of the elbow.

UCL pronator strain refers to an injury that occurs after the arm is moved from the upward-facing position to the downward-facing position, such as those made when throwing, hitting, swinging, lifting, or making overhead motions. Pain from a UCL strain will be located on the inside (medial side) of the elbow. Symptoms of UCL injuries include pain when flexing, closing, or clenching the fist as well as tingling, numbness, swelling, a slight loss of motion, and decreased power when pronating the arm. Feeling a popping sensation immediately after a UCL injury occurs is also fairly common.

The RapidForce® L Shape (inner right arm) and Reverse L Shape (inner left arm) is designed to reduce UCL pain, particularly pain resulting from overuse or over-pronation. The L Shape’s central core is adhered to the skin directly above the inner edge of the elbow bone, supporting and stabilizing the injury. Two arms—one shorter and one longer—are stretched outwards, creating additional structural support along the bend of the elbow. The resulting mechanical support shares the body’s workload, giving the sore or injured area relief to reduce inflammation and swelling and encourage the circulation of blood, oxygen, fluid, and healing nutrients to the injury site.


If you'd like assistance choosing the best RapidForce® Shape for your needs, please email us at advice@rapidforceshapes.com..

Disclaimer: Please see your medical professional with any kind of pain. Pain could be an indication of a serious condition. RapidForce® Shapes are not meant to replace professional medical advice, professional treatment, or a professional treatment plan.

RapidForce Shapes for Elbow Pain Relief

Application Instructions

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Time it Right

While RapidForce® Shapes can be applied at any time, they should be applied 1–2 hours before beginning strenuous physical activity. The Shapes can start working is as little as two hours, but some applications take up to four hours.

Prep Skin Thoroughly

Wash and dry the skin to remove oils, moisture, and dirt. Trim or shave body hair; this helps create a more secure bond and more comfortable removal. Apply the provided Skin Tac liquid adhesive wipe. Allow 30 seconds for it to dry.

Customize Stretch

Secure the Shape’s central core to the most painful spot. For daily wear or moderate-to-light athletics, a mild stretch of 1/2” is ideal. Application instructions vary based on Shape, so read and follow the instructions mailed with your shape(s).

Secure Bond

With both the Shape and the skin at room temperature, carefully begin applying the shape. Once the shape is secure, rub it vigorously to maximize adhesive bond to skin.

  1. 1. With your elbow bent approximately 90 degrees, locate the bone on the inner edge of the elbow

    1. With your elbow bent approximately 90 degrees, locate the bone on the inner edge of the elbow

  2. 1. With your elbow bent approximately 90 degrees, locate the bone on the inner edge of the elbow

    2. Apply the center of the L Shape

    Peel off the backing of the center of the L Shape and place directly over the bone. Press to secure the bond.

  3. 1. With your elbow bent approximately 90 degrees, locate the bone on the inner edge of the elbow

    3. Apply the shorter arm - 1/2” Stretch

    Peel off the middle backing of the shorter arm, leaving the end tab in place. While stabilizing the central core with one hand, customize stretch based on the intensity of activity and place parallel to the bone of the upper arm. Smooth the fabric onto the skin, moving from the center of the L Shape outwards. Remove the backing from the end tab and place on the skin. Do not stretch this small piece. Press over the entire arm of the Shape for about 10 seconds to secure the bond.

  4. 1. With your elbow bent approximately 90 degrees, locate the bone on the inner edge of the elbow

    4. Apply the long arm - 1/2" Stretch

    With arm still bent, place the long arm of the L Shape along the forearm. Apply using the same application method as described in Step 3.

  5. 1. With your elbow bent approximately 90 degrees, locate the bone on the inner edge of the elbow

    5. Feel Relief and Remove

    You may begin feeling relief within a few hours. However, it could take up to 24 hours. RapidForce shapes can provide pain relief and muscle support for up to five days but can be removed at any time. To remove, pull from the end of the arms to the center. If hair is present, pull in the direction of the hair’s growth to reduce discomfort. For easier removal, use mild warm water in the shower and then remove the shape slowly.