Shoulder Dislocation Treatment
MBBS (SINGAPORE) MMED (ORTHO) FRCS ED (ORTH)
The shoulder is the most commonly dislocated joint in the body. Dislocations of the shoulder in young adults and in older adults result in different problems.
In young adults, an initial shoulder dislocation may result in weakening of the shoulder such that the patient is prone to dislocations again in the future (recurrent dislocations).
What Is Shoulder Dislocation?
Shoulder dislocation occurs when your upper arm pops out of your shoulder socket.
A shoulder dislocation refers dislocation of the glenohumeral (ball and socket) joint. That means the ball (humeral head) is no longer sitting nicely in the socket (glenoid), but rather has “fallen off” the socket.
As you might guess, the ball can possibly “fall off” in any direction, i.e. to the front, the back, the bottom etc. But in reality, anteroinferior dislocations (the ball falls off to the front and bottom of the socket) are by far the most common.
Types of Shoulder Dislocation
Anterior Shoulder Dislocation
Anterior shoulder dislocation occurs when the head of the humerus (arm bone) is moved forward in front of the shoulder socket. This is the most common type and typically happens when the arm is extended and externally rotated, such as during a fall or when throwing.
Posterior Shoulder Dislocation
Posterior shoulder dislocation involves the humerus moving backwards and above the socket. This type of dislocation is less common and often results from seizures or electrical shocks. Due to its rarity and subtle nature, it can be challenging to diagnose.
Inferior Shoulder Dislocation
Inferior shoulder dislocation is the least common type, where the humerus is pushed downward and out of the socket toward the armpit. This type of dislocation usually occurs when there is a forceful hyperextension of the arm.
Shoulder Subluxation (Partial Dislocation)
A shoulder subluxation, or partial dislocation, happens when the head of the humerus is only partially out of the shoulder socket. While less severe than a complete dislocation, it can still cause significant pain and instability in the shoulder.
Causes of Shoulder Dislocation
Sports Injuries
Shoulder dislocations often occur in sports involving high-impact or sudden movements. For instance, slipping during rock climbing can create a powerful pulling force on the arm, while reaching out to block an opponent in rugby or basketball can similarly strain the shoulder.
Falls
Falling with the arm held out at an awkward angle is another common cause. This might happen during activities like skiing or when tripping and trying to catch yourself with an outstretched arm.
Trauma
Accidents like car crashes or significant impacts can lead to shoulder dislocation. These incidents often involve sudden, unexpected movements that the body cannot adequately brace for.
Seizures or Electric Shock
In rare cases, seizures or electric shock can cause a posterior shoulder dislocation due to involuntary muscle contractions pulling the humerus out of the socket. This type of injury is uncommon but can be severe.
Risk Factors for Shoulder Dislocation
Shoulder dislocations can happen to anyone, but certain individuals face a higher risk, including:
- Contact Sports: Athletes involved in sports like rugby, football, or basketball are at higher risk due to the physical nature of these activities, which often include collisions or sudden, forceful movements.
- Age: Individuals between 15 and 30 are more likely to experience shoulder dislocation. This age group is more active and may engage in high-risk sports or activities.
- Previous Shoulder Dislocations: If you’ve dislocated your shoulder before, you’re at a greater risk of it happening again. A previous dislocation can weaken the shoulder joint and its supporting structures.
- Gender: Men are more prone to shoulder dislocations compared to women. This may be due to a combination of factors, including different physical activity patterns and muscle strength.
What Are the Symptoms Of Shoulder Dislocation?
Common symptoms of shoulder dislocation include:
- Falling with the arm violently forced overhead
- Violent yanking force applied to the arm
- Sports injuries
- Sudden forceful twisting of the upper arm
How Is Shoulder Dislocation Diagnosed?
During a physical examination, your doctor may inspect the affected area for tenderness or any deformities. Furthermore, they may test your shoulder’s mobility by asking you to perform specific simple exercises to determine whether or not the shoulder joint is dislocated.
An X-ray of your shoulder joint may also be performed to reveal the dislocation and other damages to your shoulder joint. An MRI scan is often required to fully assess the extent of the injury.
How Is Shoulder Dislocation Treated?
Acute shoulder dislocations must be treated as soon as possible. The dislocated shoulder joint can usually be put back in position under sedation, by your doctor. It is important to avoid attempting to put the shoulder back yourself because of the risk of worsening the injury.
Some patients who have had a shoulder dislocation go on to develop a “loose shoulder”, which is prone to dislocating again, even with minimal trauma. Such a condition is known as recurrent shoulder dislocation.
Treatment for shoulder dislocation include:
Common treatment methods include:
- Rest and avoid excessive shoulder movements
- Simple and gentle stretching exercises to slowly regain shoulder mobility and strength
- Physiotherapy
What can you expect after a shoulder dislocation?
Most people recover fully from a shoulder dislocation and can return to their usual activities, including sports, once the shoulder has healed. Even if surgery is needed, the outlook remains positive, with many individuals resuming their pre-injury activity level.
However, there is an increased risk of re-injury. Studies show that athletes, particularly those under 25 who participate in contact sports, have a high chance of dislocating the same shoulder again.
Before getting back into physical activities, especially contact sports, it’s important to consult with your healthcare provider or surgeon. They can guide you on what to expect during your recovery and offer advice on preventing future dislocations.
Complications of an Untreated Shoulder Dislocation
If a shoulder dislocation is left untreated, several complications can arise, potentially affecting both the shoulder and surrounding structures. These include:
- Bone Fractures: The impact can lead to fractures in the surrounding bones, particularly the humerus or scapula.
- Ligament and Tendon Sprains: The force of the dislocation can stretch or tear the ligaments and tendons around the shoulder, causing pain and instability.
- Nerve Damage: Nerves near the shoulder may get compressed or damaged, leading to numbness, tingling, or weakness in the arm.
- Damaged Blood Vessels: The trauma can also harm blood vessels in the shoulder area, which may impact blood flow and lead to further complications.
- Muscle Strains: The muscles surrounding the shoulder can become strained or injured, impairing movement and strength.
- Hill-Sachs Lesion: This is a dent-like damage to the ball of the upper humerus, which can occur if the dislocated shoulder compresses against the edge of the socket. If not addressed, this lesion may lead to chronic instability and pain.
Preventing Shoulder Dislocation
While some risk factors for shoulder dislocation may be beyond your control, there are several proactive steps you can take to reduce your chances:
- Avoid Falls and Shoulder Injuries: Be mindful of your surroundings to prevent accidents. Use caution when participating in activities that increase your risk of falling or sustaining a shoulder injury.
- Wear Protective Gear: When engaging in contact sports or activities with a high risk of shoulder impact, use appropriate protective equipment, such as shoulder pads or braces, to shield your shoulders from injury.
- Exercise Regularly: Maintain strength and flexibility in your shoulder joints and surrounding muscles through regular exercise. Focus on exercises that enhance joint stability and muscle balance to support overall shoulder health.
- Follow Rehabilitation Guidelines: If you’ve previously dislocated your shoulder, adhere to any prescribed strength and stability exercises. Consistent practice of these exercises can help prevent future dislocations and support long-term shoulder stability.
Anatomy of the Shoulder Joint
The shoulder joint is made up of 3 bones: the shoulder blade (scapula), the humeral head and the collar-bone (clavicle).
Movements around the shoulder involve 3 separate articulations: the glenohumeral joint, the acromioclavicular joint and the scapulothoracic articulation. When the arm is raised, the majority of movement occur at the glenohumeral joint and the scapulothoracic articulation.
The glenohumeral joint is a ball and socket joint, comprising the socket (the glenoid) and the ball (the humeral head). Both surfaces of the joint are covered with an extremely smooth and rubbery cartilage (known as articular cartilage). The smooth surfaces create a frictionless articulation when lubricated with a small amount of joint fluid.
The glenoid is really a rather shallow socket. In fact, a dish is probably a more accurate description! This, however, is a design which is intended to allow the shoulder joint to have great range of movement.
Unfortunately, the price of big range of movement is stability. You can probably image that a big ball sitting on a shallow dish will fall off very easily.
While that is true to a certain extent, the body has ways of preventing this from happening. A ring of cartilage attached to the rim of the glenoid helps to not only deepen the socket, but also serves as the attachment point of ligaments that help to hold the humeral head in place. This ring of cartilage is known as the labrum.
Frequently Asked Questions
What happens after a shoulder dislocation?
In a shoulder dislocation, the humeral head gets pushed out of the socket and that often causes the labrum to get torn off the rim of the socket. Such an injury is known as an anterior labral tear or a Bankart lesion (named after the doctor who described this tear).
Often times the front of the glenoid slams into the back of the humeral head with such force that a dent is made in the humeral head. This dent is known as a Hill-Sachs lesion. This dent is usually not significant and will not be discussed further in this article.
The Bankart lesion caused by the dislocation often does not heal and remains detached from the glenoid rim. As a result, stability previously conferred by the presence of the labrum is lost, rendering the shoulder unstable.
Is shoulder dislocation serious? When should I visit a doctor?
If you suspect you have a dislocated shoulder, you should seek help at your nearest doctor or hospital immediately.
If, however, you have a “loose shoulder”, you should consider seeing a doctor but there is no urgency. This is because recurrent shoulder dislocations can cause more serious injuries to the shoulder.
I have a dislocated shoulder. How do I put it back in?
You will need to seek help either at a family clinic or at the emergency department of a hospital. However, not all family physicians have the sedatives or experience to do this procedure. I would advise against doing it yourself or getting your friend to do a quick google consult and perform it!
The reason is that sometimes other conditions such as acromioclavicular joint dislocations and even fractures or fracture-dislocations can be easily mistaken for a “typical” glenohumeral joint dislocation. Attempts to fix the dislocation will not only be extremely painful, they will at best be ineffective and may even worsen the injury.
Your doctor will need to examine your shoulder to ensure that there is, indeed a dislocated shoulder. If it is an obvious “classic” case, he may directly attempt manoeuvres to put it back in. Often, though, he will confirm the presence of a shoulder dislocation before attempting to put it back. A simple x-ray will easily confirm the diagnosis.
The procedure is often done under conscious sedation; this means the doctor will administer drugs to get you all woozy and to overcome the strong muscle spasm around the shoulder that often prevents it from getting put back in easily. Once you are sufficiently sedated, the doctor can then gently put the shoulder back in.
My shoulder has become unstable. Why has this happened?
The most common reason is that you have torn the labrum of your shoulder. This is also known as a Bankart lesion. The tear has not healed or sometimes, the labrum becomes scarred and stuck down to the neck of the glenoid (the part of the bone beneath the rim of the glenoid).
Because of this, the usual restraint against dislocation provided by the labrum is no longer working and the shoulder is easily dislocated again. Although this is the most common reason why your shoulder has become unstable, it is not the only one.
Sometimes the force of the dislocation knocks off the rim of the glenoid, resulting in a defect at one part of the rim.
In other cases, the force of the dislocation also causes the back of the ball to bump into the rim of the socket, causing a dent to form in the back of the ball. This is known as a Hill Sachs lesion (pronounced “hill-sacks”).
If the Hill Sachs lesion is large and deep enough, the rim of the glenoid may “fall into” the Hill Sachs lesion during movements, predisposing the patient to recurrent dislocations. You should seek help from your orthopaedic doctor.
What will the doctor do?
He will need to further assess you to find out the reason why your shoulder has become unstable. It is hence important for the doctor to differentiate between the different causes of dislocation in order to recommend the most suitable treatment for you.
How are unstable shoulders resulting from Bankart lesions treated?
If your shoulder has dislocated more than once previously, it is almost certainly going to dislocate again in the future. Physiotherapy alone, is not likely to reduce or prevent future dislocations.
It is hard to predict when or how often your shoulder will dislocate. Often when patients are doing activities and are aware that their shoulders might be at risk of dislocating, they are able to either engage the muscles in their shoulders to stabilize the shoulder.
But dislocations often occur when patients are not expecting it and hence cannot take measures to actively prevent it.
The most reliable way of preventing future dislocations is via a keyhole surgery known as an arthroscopic Bankart repair. During this surgery, the torn labrum is identified and any scar tissue that has formed between the labrum and the glenoid rim is released and removed.
The labrum is then brought back in apposition with the glenoid rim and secured in place. To secure the labrum, it is possible to pass sutures through the substance of the labrum because the labrum is rubbery in consistency and this is easily achieved using a needle.
However, in order to secure the labrum onto the glenoid rim (which is bone), it is necessary to drill tiny holes in the rim in order to insert small implants known as suture anchors. These suture anchors are made of either medical grade plastic or balls of suture material that expand and wedge themselves tightly in the holes (in the bone).
There is no need to remove these suture anchor in the future.
Will I be able to participate in sports after the surgery?
Absolutely. The aim of the surgery is to restore stability to your shoulder, not just during daily activities, but also during sports.
How to prevent shoulder dislocation?
- Exercise regularly to maintain the strength and flexibility of your shoulder joints and muscles
- Ensure proper form/ technique when playing sports or working out
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