Frozen shoulder can take 18 months to two years to resolve on its own. With a well-timed ultrasound-guided injection, we can ease the pain quickly and make that journey far more bearable, often getting you sleeping through the night again within days.
What is a frozen shoulder?
Frozen shoulder, or adhesive capsulitis, to give it its proper medical name, occurs when inflammation, followed by fibrosis and capsular contracture, affects the connective tissue surrounding your shoulder joint. The capsule around the glenohumeral joint (your main shoulder joint) becomes thick and tight, severely restricting movement.
Think of it this way: normally you've got a loose shirt around your shoulder that lets you move freely. With a frozen shoulder, it's as if you're wearing a very thick leather jacket instead. The fibres of the capsule thicken and shrink, creating adhesions that mechanically limit your mobility.
Why does it happen?
Honestly, we don't fully understand why frozen shoulders develop. What we do know is that they predominantly affect middle-aged women, though men certainly get them too. You're more likely to develop one if you're diabetic, or following surgery or trauma to the shoulder. But there isn't always a clear trigger, sometimes it simply happens.
Who's most at risk?
- Age 40–60, the most common bracket, though I've treated patients outside it
- Female, women are disproportionately affected
- Diabetes, one of the strongest risk factors; it can also be more severe
- Thyroid problems, both overactive and underactive increase risk
- Recent shoulder surgery or injury, even minor immobilisation can trigger it
- Other conditions, Dupuytren's contracture, heart disease, Parkinson's disease
- Previous stroke, particularly on the same side
How do I know if I have a frozen shoulder?
The hallmark is restricted active and passive range of motion combined with pain in the shoulder and upper arm. Here's the key difference from other shoulder problems: with most conditions, if someone helps lift your arm you can still move it through the pain. With a frozen shoulder, even if we pull your arm as hard as we can, it simply won't move, you're mechanically stuck in all directions.
Common symptoms include:
- Pain in the shoulder and upper arm
- Difficulty with overhead activities
- Severe pain, worse at night, disrupting sleep
- Inability to reach behind your back or across your body
- Restricted movement in all directions, particularly external rotation
Night-time is particularly brutal. In the early stages the pain is relentless, you wake repeatedly, unable to find any comfortable position. This is actually when treatment works best, as the injection can provide significant relief when you need it most.
The three stages of frozen shoulder
Understanding which stage you're in helps us time treatment for maximum benefit.
Stage 1, Freezing (2–9 months)
Pain gradually worsens, often with no clear trigger. Night pain is relentless. This is the optimal time for treatment, the ultrasound-guided injection can provide dramatic relief when you need it most.
Stage 2, Frozen (4–12 months)
As the shoulder stiffens, the pain often lessens. You can finally sleep, but you're severely limited, coats, back pockets, fastening a bra become impossible. Treatment still helps, particularly with breaking up adhesions and improving range.
Stage 3, Thawing (12–42 months)
Movement gradually returns, though progress can be frustratingly slow. Most people regain full or near-full movement, though a small percentage keep some restriction at the extremes.
The total journey typically takes 12–24 months without treatment, and sometimes longer. With appropriate intervention we can often shorten that timeline and make it far more bearable.
How is it diagnosed?
Frozen shoulder is primarily a clinical diagnosis made through careful history and examination. The typical patient is middle-aged (though not always), often female, possibly diabetic, with no red flags.
During your appointment I'll conduct a comprehensive range-of-motion assessment, checking both your active movement (what you can do yourself) and passive movement (what I can achieve by moving your arm). With frozen shoulder there's usually very little difference, you're stuck. I always perform an ultrasound scan as well, to support the diagnosis and exclude other pathology. In frozen shoulder I often see thickening of the coracohumeral ligament, a thickened inferior capsule, and fluid around the long head of biceps in the early painful stage.
Severe weakness out of proportion to pain, visible deformity, significant trauma, fever or feeling unwell, unexplained weight loss, a previous history of cancer, or progressive neurological symptoms all warrant a thorough assessment to rule out more serious pathology.
The treatment: hydrodistension with corticosteroid
One of the most effective non-surgical treatments for frozen shoulder, particularly in the early painful stage, is an ultrasound-guided injection of corticosteroid combined with hydrodistension (also called hydrodilatation or capsular distension) of the glenohumeral joint.
Here's how it works, step by step:
- Ultrasound guidance, real-time imaging to guide the needle precisely into the joint
- Local anaesthetic, I numb the skin and deeper tissues, then wait 1–2 minutes for it to take full effect
- Corticosteroid, injected into the joint to reduce inflammation and provide pain relief
- Saline distension, I then inject 20–40 ml of sterile saline into the capsule. The pressure gently stretches the tight capsule off the head of the humerus where it has become stuck, breaking up adhesions and restoring normal joint volume
The evidence, an honest view
I'll be straight with you: the research on hydrodistension is mixed. Some randomised controlled trials suggest it doesn't offer significantly more than a steroid injection alone. However, in my practice, I perform four or five of these every week, I consistently see excellent results, with decreased pain and increased motion, and experienced colleagues tend to agree. This reflects clinical experience rather than definitive long-term comparative evidence.
Sometimes during the injection I can actually see the capsule opening up on the ultrasound as the fluid goes in; occasionally one part is still adhering and, as I push more fluid in, there's a "clack" as the adhesion releases. The research doesn't distinguish these cases, but I believe that's where we see the best results. Following an evidence-based approach while drawing on extensive experience, I've found this combination highly effective for the right patient at the right time.
Ultrasound-guided injection is particularly suitable if you:
- Are in the painful freezing stage and struggling to sleep
- Have tried physiotherapy or medication for 6–12 weeks without improvement
- Have severe pain not relieved by standard painkillers
- Are significantly limited in daily activities
- Are diabetic with an HbA1c below 8.5
What does it feel like?
The procedure takes about 15–20 minutes. Is it painful? No. The key is waiting long enough for the local anaesthetic to work, most discomfort comes from the initial skin numbing. During the injection you might feel pressure or a cooling sensation as the fluid goes in, and a feeling of fullness or stretching as the capsule is gently distended, but most patients report pressure rather than pain.
What are the risks?
Risks are similar to a standard ultrasound-guided corticosteroid injection; the ultrasound visualisation ensures accuracy and safety. If you're diabetic: I won't perform the injection if your HbA1c is above 8.5 (type 1 or insulin-treated). The corticosteroid can raise blood sugar for a couple of weeks, so you'll need to monitor it and potentially adjust medication with your diabetes team.
Your recovery timeline
Days 1–2, rest
Some soreness at the injection site is normal. Rest the shoulder; gentle daily movement is fine, but avoid heavy lifting. Ice and paracetamol/ibuprofen if needed. Many patients sleep through the night for the first time in months.
Days 3–7, early movement
Pain should be reducing. Start using the arm normally for light daily activities, make a cup of tea, get dressed. Some discomfort is fine; sharp pain means ease off.
Weeks 2–4, progressive loading
Time to challenge the capsule. Start light weights or resistance, reaching in different directions. Swimming can be excellent.
Months 2–3, consolidation
You should have significant improvement. Keep loading progressively. If you've plateaued, get back in touch, we can discuss whether a repeat injection would help.
Contact me if pain suddenly worsens, you develop a fever or feel unwell, the shoulder becomes hot/red/swollen, you see no improvement by 4–6 weeks, or you develop new weakness or neurological symptoms.
Exercises & do I need physiotherapy?
The key principle is controlled stress on the capsule, challenging the shoulder without a major flare-up. Start with gentle pendulum swings in the first days, progress to wall walks, a door-frame stretch and external rotation from week one, and from week two the "heavy bucket" principle (broad sweeping movements holding a light weight or bag of shopping). Avoid aggressive stretching that causes sharp pain, and don't completely immobilise the shoulder.
On physiotherapy: I don't believe it helps in the very irritable, acute freezing stage, and as a physiotherapist myself, I've seen forcing movement then just aggravate the inflammation. Later, once the acute pain settles, physio helps you regain strength and fine-tune movement. But in those early weeks when you're in agony, the injection is far more beneficial.
Real patient stories
"I couldn't sleep for three months, different pillows, sleeping in a chair, nothing worked. I had the injection on a Tuesday, and by Thursday night I slept six hours straight. It was life-changing. It still took a few months to get full movement back, but just being able to sleep made everything manageable."
"Six weeks after minor shoulder surgery, my shoulder just froze up. The hydrodistension made an immediate difference to the stiffness. I actually heard something 'pop' during the procedure, not painful, just odd. Within a fortnight I had about 60% more movement."
"Mine appeared out of nowhere. I'd been told to 'wait it out', that it would resolve in two years. Two years! After the injection the severe pain settled within days. I went from being unable to function to getting my life back."
"I got one frozen shoulder, then the other started eight months later. The first one taught me not to wait, as soon as the second started, I was straight on the phone. Early treatment definitely made it easier to manage."
Frequently asked questions
Will it come back?
Can I drive after the injection?
When can I return to work?
Can I exercise, swim or play golf?
Will I need surgery?
How many injections will I need?
How long does the appointment take?
References & further reading
- Rangan A, et al. Frozen shoulder. BMJ. 2016;354:i4162., overview of natural history and management.
- Saltychev M, et al. Effectiveness of hydrodilatation in adhesive capsulitis of shoulder: a systematic review and meta-analysis. Scand J Surg. 2018., evidence base (mixed) for hydrodistension.
- Koh KH. Corticosteroid injection for adhesive capsulitis in primary care: a systematic review. Singapore Med J. 2016., corticosteroid benefit in the painful phase.
This page is for general information and does not replace individual medical advice. Suitability for any treatment is confirmed following clinical assessment.