Shoulder Instability

Explanation of Diagnosis

Shoulder instability means your shoulder joint is a bit too loose, so it can partially slip out (subluxation) or fully come out (dislocation). This usually involves stretching or injury to the stabilizing structures around the ball-and-socket joint, such as the labrum and joint capsule, and/or weakness or poor control of the rotator cuff and shoulder blade muscles. It often happens with a specific injury, or over time in people who repeat overhead or reaching motions. Common symptoms include a sense of shifting or “slipping,” pain with certain arm positions, reduced confidence in using the arm, clicking or catching, and sometimes fear of moving the shoulder.

Specific Work Modifications

• Keep your work at comfortable height so you are not constantly reaching overhead or out to the side.
• Avoid repetitive lifting with the arm extended away from your body; use both hands and bring the load closer.
• Take short micro-breaks every 20 to 30 minutes to reset posture and reduce strain on the shoulder.
• When using a keyboard or mouse, keep your elbows close to your sides and consider moving your workstation slightly to the front.
• If your job involves carrying tools or a backpack, use both sides when possible or reduce load and frequency.
• Avoid sustained pushing, pulling, or overhead tasks that trigger the feeling of shifting; use carts or step stools instead of reaching.

Specific Activity Modifications

• Temporarily limit throwing, serving, spiking, and heavy overhead lifting until you can move without the shoulder feeling unstable.
• Pause or reduce activities that place the shoulder in “arm out and back” positions, such as certain yoga stretches, deep behind-the-back movements, and wide-grip movements.
• Choose lower-risk cardio and conditioning (walking, stationary bike, gentle rowing without reaching into painful ranges) rather than activities that provoke instability.
• Modify strength training by using lighter resistance and staying in a pain-free, controlled range; avoid max-effort sets and sudden jerking movements.
• If you play sports, focus on technique and controlled drills before returning to full intensity, especially if you’ve had prior subluxations or dislocations.

Recommended Supplements

None

Recommended Nutrition and Hydration

Diet Recommendations

• Aim for a protein-rich diet to support tissue repair, such as eggs, dairy, fish, lean meats, beans, or tofu at each meal.
• Include anti-inflammatory foods most days, such as fruits, vegetables, olive oil, nuts, and fatty fish (salmon, sardines) if you tolerate them.
• Choose high-fiber carbohydrates (oats, brown rice, whole grains) to support overall recovery and training energy.
• If you have concerns about interactions or medical conditions, check with your clinician before starting supplements.

Hydration Tips

• Drink regularly through the day, especially if you’re exercising or working in heat.
• Use urine color as a guide; pale yellow usually indicates you’re well hydrated.
• During longer activity sessions, include some electrolytes or salty foods if you sweat heavily.

Home Exercise Prescription

Do these exercises about 3 to 5 days per week, focusing on smooth, controlled movement and stopping well before pain or a “shifting” feeling.

1. Pendulum (supported arm motion) - Lean forward with your healthy hand on a table and let the affected arm hang relaxed; make small circles and gentle forward-back and side-to-side motions for 1 to 2 minutes total.
2. Scapular setting (shoulder blade control) - Sit or stand tall, gently pull your shoulder blade backward and slightly downward without shrugging; hold for 5 to 10 seconds, repeat 10 times.
3. External rotation isometric (towel at your side) - Elbow bent and tucked near your body, press the back of your hand lightly into a towel against a wall without moving your arm; hold 5 to 10 seconds, repeat 8 to 12 times.
4. Internal rotation isometric (towel at your side) - Elbow bent and tucked near your body, press the front of your hand lightly into a towel against a wall without moving your arm; hold 5 to 10 seconds, repeat 8 to 12 times.
5. Table slide (pain-free shoulder flexion) - Stand facing a table, use your fingers to slide the arm forward only as far as it feels stable and not painful; hold 5 seconds at the end range, repeat 10 times.
6. Short-range serratus punch (on your back, light or no weight) - Lie on your back and reach the arm toward the ceiling, keeping the shoulder blade moving smoothly; do 2 sets of 8 to 12 slow reps.

Helpful Books

• "The Shoulder Book" written by Robert A. F. (and) Peter J. Millett
• "Relieve Your Shoulder Pain" written by Eric Cressey and Brian Griffin
• "Pain-Free: A Revolutionary Method for Stopping Chronic Pain" written by Pete Egoscue
• "Move Your DNA" written by Katy Bowman