A shoulder dislocation is a serious injury. Even a single episode causes structural damage inside the joint in most cases, and depending on your age and activity level, it can set off a cycle of instability, nerve injury, and long-term arthritis. The severity depends on several factors, but no shoulder dislocation should be treated as minor.
What Happens Inside the Joint
When the shoulder dislocates, the ball of the upper arm bone is forced out of its socket. That process tears or stretches the surrounding structures. A systematic review found that 71% of first-time dislocations produce a Hill-Sachs lesion, a dent in the bone of the upper arm, and 59% cause a Bankart lesion, a tear in the ring of cartilage that lines the socket. These aren’t occasional complications. They’re the norm.
Beyond bone and cartilage damage, the rotator cuff tendons, ligaments, and joint capsule can all be stretched or torn during a dislocation. In people over 60, the risk of a rotator cuff tear alongside a dislocation ranges from 7% to as high as 60%, with the likelihood climbing with age. For younger people, the cartilage and ligament damage is more common and tends to drive the cycle of repeat dislocations.
Nerve Injuries Are More Common Than Most People Think
The shoulder joint sits next to a dense network of nerves, and a dislocation can stretch or compress them. The most frequently injured is the axillary nerve, accounting for about 35% of nerve injuries after dislocation. Damage to this nerve weakens your ability to lift your arm out to the side and rotate it outward. Other nerves in the area can also be affected, including the radial nerve (13% of cases), which controls wrist and finger extension, and the suprascapular nerve (11%), which also affects shoulder strength.
Most axillary nerve injuries resolve within a few months, but recovery depends on how severely the nerve was damaged. Higher-energy injuries, like those from falls or collisions, carry a greater risk of nerve complications and associated bleeding around the joint.
Age Changes the Risk Profile
Your age at the time of your first dislocation shapes what happens next. For younger people, the main concern is recurrence. A study of a US population found that patients aged 16 to 20 had a 47.1% recurrent instability rate within 10 years when managed without surgery. Those 15 and under had a 38.8% rate. Each repeat dislocation causes additional structural damage, and the prevalence of bone and cartilage lesions is significantly higher in recurrent dislocations (85% for Hill-Sachs lesions, 66% for Bankart lesions) compared to first-time events.
For older adults, recurrence is less of a concern, but the immediate injury tends to be worse. Rotator cuff tears are far more common, and the blood vessels near the joint become more fragile with age, increasing the risk of vascular injury during the dislocation or during the process of putting the shoulder back in place.
Long-Term Arthritis Risk
Shoulder dislocation doesn’t just cause short-term problems. A population-based study with an average 15-year follow-up found that 22.7% of patients under 40 who experienced shoulder instability developed symptomatic arthritis in the joint. A separate study with 25 years of follow-up found that 55% of patients showed arthritic changes on X-rays after a first-time dislocation before age 40.
Several factors increase this risk: smoking (which roughly quadrupled the odds), having naturally loose joints, working in physically demanding jobs, higher body weight, and being older at the time of the first instability event. The takeaway is that even in young, otherwise healthy people, a dislocated shoulder can accelerate joint wear that shows up years or decades later.
Why You Shouldn’t Try to Put It Back Yourself
It’s tempting to try to pop a dislocated shoulder back into place, especially if you’ve seen it done in movies. This is genuinely dangerous. The reduction process itself can injure the axillary artery or the nerves surrounding the joint, particularly if done without proper technique, imaging, or muscle relaxation. If the dislocation is more than 7 to 10 days old, the risk of tearing the axillary artery during reduction increases significantly, especially in older patients.
In a medical setting, doctors check the blood flow to your hand and test nerve function before and after reduction. They use sedation and muscle relaxation to make the process safer and less painful. Afterward, X-rays confirm the bone is properly seated and check for fractures. None of this can be replicated at home.
What Imaging Reveals
After a dislocation is reduced, X-rays are the first step to check for fractures and confirm the joint is back in place. About a week later, an MRI is typically recommended to reveal soft-tissue injuries like labral tears, ligament damage, and rotator cuff tears. In the acute setting, blood and swelling inside the joint act as a natural contrast agent, making a standard MRI nearly as effective as one with injected dye.
If bone loss in the socket or a significant dent in the upper arm bone is suspected, a CT scan with 3D reconstruction provides the most accurate picture. The extent of bone loss plays a direct role in determining whether surgery is needed.
When Surgery Becomes Necessary
Not every shoulder dislocation requires surgery, but several situations push treatment in that direction. Recurrent dislocations are the most common reason. Young athletes in contact sports, patients with significant bone loss in the socket, and those with large bone dents in the upper arm are also strong candidates for surgical stabilization. When bone loss exceeds about 20% of the socket surface, a bone transfer procedure is typically recommended rather than a standard soft-tissue repair.
For first-time dislocations, especially in people over 30 who aren’t involved in high-risk sports, a trial of physical therapy and activity modification is reasonable. But given the high recurrence rates in younger patients, some orthopedic surgeons recommend early surgical repair after a first dislocation in teens and young adults to prevent the cumulative damage that comes with repeat episodes.
Recovery and Return to Activity
If you’re treated without surgery, the shoulder is usually immobilized in a sling for anywhere from a few days to six weeks, depending on the severity and your goals. For athletes trying to return to competition quickly, a short immobilization period of 3 to 10 days followed by rehabilitation is common. Most athletes return to sport within 2 to 3 weeks after a first dislocation, though some college athletes have returned in as little as 5 days.
After surgery, the timeline is much longer. You’ll wear a sling for at least four weeks, and return to contact sports is restricted until at least four to six months post-surgery, once strength in the repaired shoulder matches the other side. Full recovery and clearance for unrestricted activity typically happens around the six-month mark.
Rehabilitation for Long-Term Stability
Whether or not you have surgery, rehabilitation is critical for preventing future dislocations. The program focuses on three areas. First, strengthening the rotator cuff muscles, which press the ball of the shoulder into the socket. This involves resistance exercises in internal rotation (toward the body) and external rotation (away from the body). Second, training the muscles that control the shoulder blade, since these muscles position the socket so the ball stays centered during movement. Third, building coordination and endurance through activities like swimming, rowing, or cross-country ski machines.
Skipping or shortcutting rehab significantly increases your odds of another dislocation, and each subsequent dislocation causes more structural damage and brings you closer to chronic instability or early arthritis.