Yes, you can sprain a shoulder. A shoulder sprain is a stretch or tear of the ligaments that hold the joint together, most commonly at the point where your collarbone meets the top of your shoulder blade. Mild sprains heal in one to two weeks, while severe ones can take a few months. The injury is distinct from a strain, which affects muscles or tendons rather than ligaments.
Where Shoulder Sprains Happen
The shoulder is stabilized by several ligaments, and a sprain can occur at two main joints. The most common location is the acromioclavicular (AC) joint, the small connection at the top of your shoulder where the collarbone meets a bony projection of the shoulder blade. Three sets of ligaments hold this joint in place: one that prevents side-to-side movement and two deeper ligaments that prevent the collarbone from shifting up or down.
The other, less common location is the sternoclavicular joint, where the collarbone meets the breastbone near the base of your throat. Sprains here are usually mild and resolve in one to two weeks with rest. Severe injuries at this joint are rare but can be serious because of the nearby blood vessels and airways.
What Causes a Shoulder Sprain
Most shoulder sprains result from a direct blow or fall. Landing on an outstretched hand, falling directly onto the point of the shoulder, or taking a hit during contact sports are the classic scenarios. Car accidents, cycling crashes, and hard falls while skiing account for many cases outside of sports. The force drives the shoulder blade downward while the collarbone stays in place, stretching or tearing the ligaments between them.
Grades of Severity
Shoulder sprains are classified using a six-level system, though the first three grades cover the vast majority of injuries people experience.
- Grade I: The AC ligament is stretched but intact. The deeper ligaments are unaffected. You’ll have tenderness and mild swelling at the top of the shoulder, but the joint remains stable.
- Grade II: The AC ligament is torn and the deeper ligaments are partially damaged. The collarbone shifts slightly upward, and you may notice a small bump at the top of the shoulder. Pain is more significant, especially with arm movement.
- Grade III: Both the AC and deeper ligaments are completely torn. The collarbone displaces noticeably upward, creating a visible bump. The joint is unstable, and lifting the arm overhead is painful and difficult.
Grades IV through VI involve the collarbone displacing backward, dramatically upward (more than 25 mm), or downward beneath the shoulder blade. These are uncommon and typically result from high-energy trauma.
Symptoms and How It’s Diagnosed
A shoulder sprain typically causes immediate pain at the top of the shoulder, swelling, and tenderness when you press on the joint. You may feel a sharp ache when reaching across your body or lifting your arm. In more severe sprains, you can often see and feel a bump where the collarbone has shifted out of position.
During a physical exam, a clinician will likely ask you to bring your arm across your chest toward the opposite shoulder. Pain at the top of the shoulder during this movement points toward an AC joint injury. Another common test involves holding your arm out in front of you with your thumb pointing down while the examiner pushes down on your wrist. If that produces pain on top of the shoulder that eases when you turn your palm up, it suggests the AC joint is the source.
X-rays can reveal whether the collarbone has shifted relative to the shoulder blade, which helps determine the grade. MRI is sometimes used for borderline cases or when a doctor suspects additional damage to the rotator cuff or the cartilage rim inside the joint.
Sprain vs. Rotator Cuff Injury
Because the shoulder is complex, it’s easy to confuse a ligament sprain with a rotator cuff problem. A sprain involves the ligaments connecting bones at the top of the shoulder. A rotator cuff injury involves the tendons and muscles that power arm rotation and overhead movement.
The key differences show up in where and how the pain behaves. A sprain concentrates pain right at the top of the shoulder, especially when you press the joint or reach across your body. A rotator cuff tear tends to cause pain deeper in the shoulder or down the side of the arm, along with noticeable weakness when lifting or rotating. Rotator cuff tears also commonly cause pain at night, particularly when lying on the affected side. A crackling or snapping sensation during movement is more typical of tendon damage than a ligament sprain.
Treatment for Mild and Moderate Sprains
Grade I and II sprains are managed without surgery. The initial phase focuses on pain control: rest, ice, and a sling to keep the joint still. For grade I injuries, this phase is brief, often just a week or two. Grade II sprains typically need four to five weeks of sling immobilization because the partially torn ligaments require more protected healing time.
Once the acute pain subsides, rehabilitation follows a predictable progression. Early exercises focus on restoring range of motion with gentle, passive movements: someone (or your other hand) guides the injured arm through forward reaching, sideways lifting, and outward rotation. A common starting point is three sets of 10 repetitions, two to three times per day.
Strengthening begins with isometric exercises, where you push against a wall or doorframe without actually moving the joint. These are held for about five seconds, repeated ten times, three times daily. The goal is to rebuild the muscles around the shoulder blade and the rotator cuff without stressing the healing ligaments.
As strength returns, you progress to resistance band work. Exercises like pulling the band outward with your elbows at your sides (external rotation), squeezing your shoulder blades together (rows), and raising your arm at an angle with your thumb up (sometimes called the “open can” exercise) target the muscles that stabilize the entire shoulder complex. Each is typically done for 12 to 15 repetitions, three times a day. When those become easy, you increase repetitions until the muscle fatigues rather than jumping to heavier resistance too quickly.
When Surgery Is Considered
Grade I and II sprains almost never require surgery. Grade III sprains fall into a gray area. Most patients with a grade III injury start with conservative treatment, wearing a sling for four to five weeks and then rehabilitating. Surgery becomes a consideration if the shoulder remains unstable, if the muscles around the shoulder blade aren’t functioning properly, or if the person needs full overhead strength for their work or sport.
For grades IV, V, and VI, most surgeons recommend operative repair because the collarbone is displaced so far that the ligaments cannot heal in the correct position on their own. That said, some studies have reported acceptable outcomes with non-surgical management even at these levels, so the decision involves weighing the severity of displacement, your activity demands, and how much the instability affects daily function.
Recovery Timeline
A grade I sprain at the AC joint typically resolves in one to two weeks. Sternoclavicular joint sprains follow a similar timeline for mild injuries. Grade II sprains generally take three to six weeks before you can return to normal activity, with full strength rebuilding over the following weeks of rehab. Grade III and higher sprains, whether managed with or without surgery, can take a few months for full recovery. Return to contact sports or heavy overhead work usually requires completing the full strengthening progression and demonstrating equal strength on both sides.