What Is a Frozen Shoulder?
Frozen shoulder
is a condition that affects your shoulder joint. It
usually involves pain and stiffness that develops gradually, gets worse and
then finally goes away. This can take anywhere from a year to 3 years.
Your shoulder is made up of three bones that form a ball-and-socket
joint. They are your upper arm (humerus), shoulder blade (scapula), and
collarbone (clavicle). There’s also tissue surrounding your shoulder joint that
holds everything together. This is called the shoulder capsule.
With frozen shoulder, the capsule becomes so thick and tight that it’s
hard to move. Bands of scar tissue form and there’s less of a liquid called
synovial fluid to keep the joint lubricated. These things limit motion even
more.
Symptoms
The main symptoms of a frozen shoulder are pain and stiffness that make
it difficult or impossible to move it.
If you have frozen shoulder, you’ll likely feel a dull or achy pain in
one shoulder. You might also feel the pain in the shoulder muscles that wrap
around the top of your arm. You might feel the same sensation in your upper
arm. Your pain could get worse at night, which can make it hard to sleep.
You’ll typically go through three phases with a frozen shoulder. Each
has its own unique symptoms and timeline.
Freezing stage:
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- You develop a pain
(sometimes severe) in your shoulder any time you move it.
- It slowly gets worse over
time and may hurt more at night.
- This can last anywhere
from 6 to 9 months.
- You’re limited in how far
you can move your shoulder.
Frozen stage:
- Your pain might get better but your stiffness gets worse.
- Moving your shoulder becomes more difficult and it becomes harder
to get through daily activities.
- This stage can last 4-12 months.
Thawing stage:
- Your range of motion
starts to go back to normal.
- This can take anywhere
from 6 months to 2 years.
Causes
It’s not clear why some people develop it, but some groups are more at
risk.
Frozen shoulder happens more often in women than men, and you’re more
likely to get it if you’re between the ages of 40 and 60. Your risk might also
go up if you’re in the process of recovering from a medical condition like a stroke, or surgery like a mastectomy that keeps you from moving your
arm.
Certain medical conditions can increase your risk too. You may also be
more likely to get frozen shoulder if you have diabetes. About 10% to 20% of people with
diabetes get frozen shoulder. Other medical problems like heart disease, thyroid
disease, or Parkinson’s disease are linked to frozen shoulder, too.
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Diagnosis
To diagnose frozen shoulder, your doctor will give you a physical exam.
She'll check it to see how badly it hurts and how far it moves. During the
“active” part of the exam, she’ll let you move your shoulder on your own.
During the “passive” portion, she’ll move it for you, and note the differences.
Your doctor may decide you need an injection of anesthetic
in your shoulder. This is a medication that will numb the pain so that
she can better judge your active and passive ranges of motion.
A physical exam is usually enough to diagnose frozen shoulder, but your
doctor may also order imaging tests such as X-rays, ultrasound,
or MRI to rule
out other problems like arthritis or
a torn rotator cuff
that can also cause pain
and limit how far it moves.
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Treatment
Over-the-counter nonsteroidal anti-inflammatory drugs (NSAIDs) like
aspirin or ibuprofen
can help relieve the pain and inflammation
in your shoulder. If they don’t help, your doctor might prescribe a stronger
medication.
Your treatment might also include going to a physical therapist for
strengthening and stretching exercises
to improve your range of motion.
If your symptoms are intense or don’t improve over time, your doctor
might recommend other kinds of treatments, including:
- A corticosteroid
injection in your shoulder joint to reduce your pain
and improve your range of motion.
- Joint distension. This means your doctor
will inject sterile water into your shoulder capsule to stretch it. This
can help you move your shoulder more easily.
- Physical therapy. Results with this are
mixed, and it may be more useful during certain phases of frozen shoulder
than others.
- Surgery. This is very rarely
necessary to treat frozen shoulder. But if other treatments haven’t
helped, your doctor may suggest surgery. It likely would be an
arthroscopic procedure. That means it’s done with lighted, pencil-sized
tools that are inserted through tiny cuts in your shoulder.
- Shoulder manipulation can help loosen up your
shoulder tissue, but is very rarely done anymore because arthroscopic
surgery has replaced it. Surgeons would forcefully move the
shoulder under general anesthesia.
With this method, there was an increased risk of complications including fractures.