A dislocation is an injury where the bones in a joint are forced out of their normal position. The bone ends that normally meet and move smoothly against each other get pushed apart, often by a fall, a blow, or a sudden twist. Dislocations can happen in almost any joint, but some are far more common than others, and the injury ranges from relatively minor to a medical emergency depending on the location and severity.
How a Dislocation Differs From a Fracture
A fracture is a break in the bone itself. A dislocation is a problem at the joint, where two or more bones connect. The bones may be intact, but they’ve been knocked out of alignment. That said, the two injuries often happen together: the same force that dislocates a joint can also chip or crack the surrounding bone. Ligaments, the tough bands of tissue that hold joints together, are frequently torn or stretched during a dislocation as well.
There’s also a partial version of the injury called a subluxation. In a subluxation, the bone shifts partially out of position but stays in some contact with the joint surface. A full dislocation means the bone ends have completely separated. Subluxations can still cause significant pain and instability, but they’re generally less severe.
Which Joints Are Most Commonly Affected
The shoulder is by far the most frequently dislocated joint, accounting for about half of all dislocations in one large study of over 2,700 patients. Fingers came in second at around 10%, followed by toes, the hip, and the elbow. The shoulder’s vulnerability comes down to its design: it trades stability for an enormous range of motion, making it easier for the upper arm bone to slip out of its shallow socket.
Men are dislocated roughly four times as often as women, largely because of higher rates of contact sports and high-impact activities. The peak age group is 21 to 25, and the average age across all dislocations is about 35.
Symptoms to Recognize
A dislocation usually makes itself obvious. The joint looks visibly deformed or out of place, and the pain is immediate and intense. Other common signs include swelling, bruising, and a complete inability to move the joint. Some people also describe a feeling of instability, as if the joint is loose or weak. In more severe cases, particularly with hip or elbow dislocations, there may be numbness or tingling below the injury if nearby nerves are compressed or stretched.
What to Do Immediately
The most important rule: don’t try to push the joint back into place yourself. Forcing a bone back into its socket can damage muscles, ligaments, nerves, and blood vessels. Instead, keep the joint completely still. If you can, use a makeshift splint or sling to immobilize it. Apply ice to reduce swelling, and get medical help as quickly as possible.
How Doctors Diagnose and Treat It
Diagnosis typically starts with a physical exam and X-rays to confirm the dislocation and check for fractures. In some cases, particularly when doctors need to assess damage to ligaments or other soft tissue, an MRI provides a more detailed picture. MRI can directly visualize the supporting structures around the joint, which X-rays can’t do, and the findings sometimes change the treatment plan.
The primary treatment is a procedure called closed reduction, where a doctor manually guides the bone back into position. This sounds dramatic, but many techniques exist, and some can be performed without sedation. For shoulder dislocations, one method called scapular manipulation required no sedation in 90% of patients. Another approach, the FARES method, succeeded without sedation nearly 89% of the time. For kneecap dislocations, sedation is typically unnecessary, and getting the bone back in place provides immediate pain relief.
After reduction, the joint is immobilized in a brace, splint, or sling to let the damaged tissues heal. Surgery becomes necessary when ligaments are badly torn, when bone fragments are loose in the joint, or when the dislocation keeps recurring.
Recovery Timeline
Recovery depends on which joint was affected and whether surgery was needed. For a first-time kneecap dislocation treated without surgery, most people return to light activities within four to six weeks, with a full return to sports assessed around six to eight weeks. If surgical repair is required, the timeline stretches to four to six months.
Physical therapy plays a central role in recovery regardless of the joint involved. The goals are reducing swelling, restoring range of motion, and rebuilding strength in the muscles that stabilize the joint. For kneecap injuries, that means focused strengthening of the quadriceps and hip muscles. For shoulders, the rotator cuff muscles are the priority. Before returning to sports or demanding physical activity, patients typically need to demonstrate no pain, no swelling, full range of motion, and near-equal strength compared to the uninjured side.
Why Dislocations Often Happen Again
One of the most frustrating aspects of dislocations is recurrence. Once a joint has been dislocated, the ligaments and surrounding structures are stretched or torn, making the joint less stable than it was before. Age at the time of the first dislocation is the single biggest predictor of whether it will happen again.
Young people face the highest risk. In a study tracking patients for 10 years, those aged 16 to 20 at their first shoulder dislocation had a recurrence rate of 47% with non-surgical treatment. Even with surgery, about 25% of that age group experienced another episode. For every year younger someone is at their first dislocation, the risk of recurrence or needing surgery increases by about 4%. Older adults, by contrast, have much lower recurrence rates, partly because they tend to be less active in high-risk sports.
Long-Term Complications
Most dislocations heal well with proper treatment, but serious complications can develop, especially with high-energy injuries or delayed treatment. Hip dislocations carry some of the highest complication rates. Up to 25% of patients develop post-traumatic arthritis in the affected hip. The blood supply to the bone can also be disrupted, leading to a condition where bone tissue dies from lack of blood flow. In one study, this occurred in half the cases where multiple reduction attempts were needed, compared to only 16% when the joint was successfully repositioned on the first try.
Nerve damage is another concern. About 11% of posterior hip dislocation patients in one study experienced injury to the sciatic nerve, which runs near the hip joint. Half recovered fully within three months, but the other half still had incomplete recovery two years later, particularly when the dislocation wasn’t treated within 12 hours. Abnormal bone growth around the joint, which can limit movement permanently, was also more common when reduction required multiple attempts.
Conditions That Increase Risk
Some people are more prone to dislocations because of underlying conditions that affect their connective tissue. Ehlers-Danlos syndrome, particularly the hypermobile type, causes joints that stretch far beyond normal range and pop out of place repeatedly. People with this condition often have soft, stretchy skin that bruises easily, along with chronic pain and fatigue. The dislocations they experience can happen during everyday activities, not just sports or trauma, because the ligaments that normally hold joints in place are fundamentally weaker.
Generalized joint hypermobility, even without a formal diagnosis of Ehlers-Danlos, also raises dislocation risk. If you find that multiple joints bend further than most people’s, or you’ve had dislocations in more than one joint without major trauma, it’s worth having the underlying cause evaluated.