Anterior Shoulder Instability

Star Shape - Pain Relief & Muscle Support Shape

RapidForce® Shapes stabilize and support the muscles, tendons, and ligaments in the shoulder. The Star Shape is designed to reduce swelling by gently lifting the skin above the pain point, which can help circulate blood, oxygen, fluids, and nutrients to an injury site.

Anterior instability is an injury to the glenohumeral joint in the shoulder. The rounded top portion of the upper arm bone (humerus) is dislocated from the shoulder socket (glenoid cavity) and thrust toward the front side (anterior) of the body.

Anterior instability is caused by repetitive arm and shoulder movements or gradual wear and tear. Workers with labor-intensive jobs or athletes who participate in swimming, baseball, softball, volleyball, gymnastic, and weightlifting are the most likely to develop anterior shoulder pain. As opposed to glenohumeral dysfunction where the pain is in the back of the shoulder blade, pain from anterior instability will be located in the front of the shoulder, 2–3 inches above the armpit.

Pain from shoulder instability can include a wide variety of symptoms, including stiffness, weakness, a popping or grinding sensation, pain deep within shoulder joint, pain when reaching backward or overhead, tenderness, a feeling of looseness or as though the arm is “just hanging there.” Signs of shoulder instability can also include numbness, tingling, loss of strength or function, decreased range of motion, and the shoulder repeatedly giving out.

RapidForce® Star Shapes are designed to reduce shoulder pain, including pain from anterior shoulder instability. The Star Shape has a central core that is placed on the skin 2–3 inches above the armpit, right above the area where the upper arm meets the shoulder joint. The Shape’s six arms are stretch outwards, providing addition stabilization and support for the area surrounding the shoulder. The Star Shape also provides mechanical lift, which literally lifts the upper layers of skin, encouraging blood, oxygen, nutrients, and healing fluids to reach an injury site more efficiently.

RapidForce® Shapes are unlike any other pain-relief product on the market today. Each Shape’s patented design was carefully developed and perfected by a team of physical therapists, athletic trainers, engineers, and an ultrasound technician who sought to create a product that supports the muscles and helps relieve pain caused by muscle, tendon, joint, and ligament injuries. RapidForce® Shapes are used by athletes at all levels, including professional athletes, semi-pro athletes, and people who lead or want to lead an active lifestyle.

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

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 Shoulder Pain

Star Shape

From $9.95

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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. Locate a point 2–3 inches above the armpit

    1. Locate a point 2–3 inches above the armpit

  2. 1. Locate a point 2–3 inches above the armpit

    2. Apply the center of the Star Shape

    Peel off the backing of the central core of the Star Shape and orient it so the short are align with the armpit. Place over the front of the shoulder. Press to secure the bond.

  3. 1. Locate a point 2–3 inches above the armpit

    3. Apply the arms - 1/2” Stretch

    Peel off the middle backing of one of the arms, leaving the end tab in place. While stabilizing the center with one hand, customize the stretch based on intensity of activity and place straight out from the center. Smooth the fabric onto the skin, moving from the center of the 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 Star Shape for about 10 seconds to secure the bond. 

  4. 1. Locate a point 2–3 inches above the armpit

    4. Apply the other Arms - 1/2" Stretch

    Repeat for all arms, following application method from Step 3.

  5. 1. Locate a point 2–3 inches above the armpit

    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.