Is hydrodilatation painful?

It's uncomfortable rather than painful for most. You feel the needle and then a building pressure and stretch as the fluid goes in, which can be quite intense for a minute or two. Local anaesthetic is used, and some people find the pressure the worst part. Afterwards there's usually aching for a day or two, then it settles. Most people tolerate it well.

How long does the effect last?

For people who respond, the range gain is often meaningful and can be lasting, because the procedure stretches the contracted capsule mechanically. That said, it doesn't stop the underlying process, so if you're still in an active freezing phase the benefit can wear off. It tends to work best as a bridge to move a stuck frozen phase forward, combined with physiotherapy to lock in the new range.

Should I try a cortisone injection or hydrodilatation first?

Usually a cortisone injection first, especially if you're in the painful freezing phase — it's simpler, cheaper, and targets the inflammation driving the pain. Hydrodilatation is the next step when pain is controlled but range is genuinely stuck, or when an injection alone hasn't been enough. They're sometimes combined in the one procedure. More on injections here.

Can I have hydrodilatation if I have diabetes?

Yes, and it can be a particularly good option. Because repeated corticosteroid injections can raise blood sugar, hydrodilatation — which may use saline with little or no steroid — is sometimes preferred for people with diabetes who need more than an injection. The decision is made with your doctor, balancing blood sugar control against the severity of the restriction.

Do I still need physio afterwards?

Yes — this is the part people want to skip and shouldn't. Hydrodilatation creates new range, but you have to actively use it or the capsule tightens back down. Physiotherapy starting soon after the procedure, with mobilisation and progressive stretching, is what turns the temporary gain into lasting improvement. The procedure and the rehab work together.

Hydrodilatation for Frozen Shoulder: What It Is, What to Expect, and Who Benefits

You’ve been told your frozen shoulder isn’t moving and you should have hydrodilatation — and now you’re googling it at midnight trying to work out what on earth it involves. It’s an intimidating name for a fairly straightforward idea: stretch the contracted capsule from the inside using fluid, to gain back the range the condition has taken.

It sits in the middle of the treatment ladder — more involved than a cortisone injection, far less involved than surgery — and for the right people it can be the thing that shifts a stuck shoulder. Here’s the straight version of what it is, what it feels like, and where it fits. The full treatment overview is here →

What hydrodilatation actually is

In frozen shoulder, the joint capsule — the sleeve of tissue around the shoulder joint — has inflamed, thickened, and contracted, pulling tight around the joint and mechanically limiting movement. Hydrodilatation (sometimes called arthrographic distension) tackles that mechanical restriction directly.

An interventional radiologist or specialist inserts a needle into the shoulder joint under imaging guidance (usually ultrasound or X-ray), injects a small amount of contrast to confirm the needle is in the right place, and then injects fluid — saline, often with a corticosteroid — to progressively fill and stretch the joint capsule from within. The volume physically distends the contracted capsule, and in many cases you can feel or see the capsule give way as the adhesions stretch. The aim is a mechanical gain in range that stretching from the outside hasn’t been able to achieve.

Who it suits — and who it doesn’t

Hydrodilatation isn’t a first-line treatment, and it isn’t for every phase. It tends to help when:

You’re in the frozen phase— pain has eased but range is genuinely stuck at its most restricted. This is where the mechanical stretch earns its place. More on the phases →
Conservative management has plateaued.You’ve done physiotherapy and possibly a cortisone injection, and the range simply isn’t progressing.
The restriction is limiting your life or work.There’s a real reason to push for more range rather than waiting for the thawing phase to do it slowly.

It’s less useful — and can even aggravate things — in the acute freezing phase, when the capsule is hot and inflamed rather than just tight. Stretching an inflamed capsule, even from the inside, drives more inflammation. This is why matching the intervention to the phase matters.

What the procedure feels like

It’s usually done as a day procedure with local anaesthetic, sometimes with light sedation. You lie down while the clinician uses imaging to guide the needle into the joint. There’s a sting from the local anaesthetic, then pressure as the needle goes in. When the fluid starts going in, you feel a building pressure and stretch inside the shoulder — for most people that’s the most uncomfortable part, and it can be quite intense for a minute or two as the capsule distends.

It’s usually quick — the injection itself takes only a few minutes. Afterwards the shoulder is typically sore and achy for a day or two, like a deep bruise, and the range can actually feel worse initially from the irritation. As that settles over the following days, the gain in movement usually becomes apparent.

How well it works

The evidence for hydrodilatation is moderate but genuinely there: a meaningful proportion of people get a real gain in range and a reduction in pain, and for many it’s the intervention that finally shifts a stuck shoulder. It tends to outperform a cortisone injection alone for range, and it’s less invasive than surgery.

The honest caveats: not everyone responds, the gain isn’t always large, and if you’re still in an active freezing phase the benefit can wear off as the inflammation continues. It’s best understood as a strong option for the right person at the right time — not a guaranteed fix.

What comes after is the half that matters

This is the part that determines whether the gain sticks. Hydrodilatation creates new range, but the capsule will tighten back down if that range isn’t actively used. That means physiotherapy starting within days of the procedure — mobilisation, progressive stretching into the newly available ranges, and strengthening — to lock in the improvement.

People who have the procedure and then rest, expecting it to have “fixed” things, often end up back where they started. Those who follow it with committed rehab tend to do well. It’s a partnership between the intervention and the work afterwards. More on hands-on treatment →

How it fits with the other options

In the ladder of frozen shoulder treatment, hydrodilatation sits here:

First: phase-appropriate physiotherapy, often with a cortisone injection for the painful freezing phase. More on injections →
Next, if range is stuck: hydrodilatation to mechanically gain range.
Last resort: surgery (manipulation under anaesthesia or capsular release) for genuinely refractory cases. More on the surgery decision →

It’s a middle-tier option — more than an injection, less than surgery — and for the right frozen-phase shoulder it can be exactly the step that gets things moving again.