Frozen Shoulder and Periarthritis: The Three Phases and What Treatment Works at Each Stage
Periarthritis means inflammation of the structures around a joint rather than of the joint surface itself: the capsule, the tendons, the ligaments and the bursae. In the shoulder it has a specific and unmistakable form, called adhesive capsulitis or frozen shoulder, where the joint capsule thickens, contracts and physically restricts movement.
What makes frozen shoulder different from other shoulder pain is that the restriction is structural. It is not pain stopping the arm from moving, and it is not weakness. Someone else can take the arm and it still will not go. That single observation is what confirms the diagnosis, and it is also why the condition follows a timeline rather than responding to a treatment.
Two things people most want to know are how long it lasts and whether they are making it worse. Both depend entirely on which phase they are in, so that is where this guide starts.
🧊 The three phases and their real timelines
| Phase | Duration | What dominates | What the shoulder does |
|---|---|---|---|
| 1. Freezing | 2 to 9 months | Pain | Worsening pain, especially at night; motion starts to shrink |
| 2. Frozen | 4 to 12 months | Stiffness | Pain eases; movement is severely limited and the limit feels like a wall |
| 3. Thawing | 5 to 24 months | Recovery | Motion gradually returns, usually in the reverse order it was lost |
Total duration is commonly one to three years. That figure is unwelcome and it is honest: frozen shoulder is self-limiting but slow. Treatment shortens the painful phase considerably and improves function along the way, though no treatment reliably compresses the whole course into a few weeks.
📊 Recovery is usually good but not always complete. Most people regain function they are satisfied with. Measured against the other side, a degree of restriction persists in a substantial minority, often in external rotation. It is typically small enough not to affect daily life.
🔍 The exam finding that settles the diagnosis
The hallmark is loss of passive external rotation. With the elbow tucked against the side and bent to ninety degrees, the forearm should rotate outwards. In frozen shoulder it does not, whether the person moves it or someone moves it for them.
This is what separates it from the conditions it gets confused with:
| Condition | Passive movement | Distinguishing feature |
|---|---|---|
| Frozen shoulder | Restricted in all directions, worst in external rotation | A firm end point; the arm simply stops |
| Rotator cuff tendinopathy | Preserved | Painful arc between roughly 60 and 120 degrees; weakness on resisted testing |
| Subacromial bursitis | Preserved | Pain on overhead reach, tender point at the outer shoulder |
| Calcific tendinitis | Preserved between attacks | Sudden severe pain; calcium deposit visible on X-ray |
| Shoulder osteoarthritis | Restricted | Grinding on movement; joint space narrowing on X-ray |
X-rays are normal in frozen shoulder and are taken to rule out arthritis, fracture or calcium deposits rather than to confirm anything. MRI can show a thickened capsule but is rarely needed when the examination is clear.
🩸 Diabetes changes everything about this condition
The link is strong enough that a frozen shoulder appearing without any injury is a reason to check blood sugar.
- 📈 Risk is up to five times higher in people with diabetes, and roughly 10 to 20 percent will develop it
- 🤝 Both shoulders are affected far more often, sometimes at the same time
- ⏳ The course is longer and more resistant to every treatment, including injections and surgery
- 🧪 The mechanism is thought to involve glycation of collagen in the capsule, making it stiffer and less able to remodel
Thyroid disease, particularly an underactive thyroid, carries a similar though weaker association. So does a period of enforced immobility: after a fracture, after shoulder or breast surgery, after a stroke, or after any injury that leads to weeks of keeping the arm still.
👤 The typical picture. Age 40 to 60, more often a woman, one shoulder, no injury to explain it. The other shoulder is affected at some point in roughly one in five people; the same shoulder twice is rare.
🔥 Phase one: control pain, protect movement
In the freezing phase the capsule is actively inflamed. Pain is the problem, night pain is usually the worst part, and this is the phase where the wrong approach does real harm.
⚠️ Aggressive stretching in the painful phase makes it worse. Forcing the joint against an inflamed capsule increases inflammation, increases guarding and lengthens the whole course. The instruction that applies here is the opposite of the usual one: move within the range that does not provoke sharp pain, and no further. The hard stretching belongs to phase two.
💊 Pain control that lets you keep moving
- 🧴 Topical diclofenac — Emulgel (Diclofenac 1%) or Jonac (Diclofenac Gel 1%), applied two to four times daily and rubbed in over the front and outer shoulder. Systemic absorption is a small fraction of the oral dose, which makes it the safer starting point for anyone with stomach, kidney or cardiovascular concerns. Allow two weeks before judging it
- 💊 Oral NSAIDs — Voltaren (Diclofenac 50/75/100 mg), Naprosyn (Naproxen) or Mobic (Meloxicam 7.5/15 mg), taken with food for the shortest period that does the job
- 🧊 Heat before movement, cold after. Heat for ten minutes loosens the tissue before exercises; cold afterwards settles the reaction
- 🛏️ Sleep setup — lie on the unaffected side with a pillow supporting the painful arm in front of the body, which keeps the capsule off its most painful stretch
💉 The treatment with the best early evidence
An intra-articular corticosteroid injection given during the painful phase produces faster pain relief and better range of motion than physiotherapy alone, with the largest benefit in the first weeks. Ultrasound guidance improves accuracy. The effect is greatest early and diminishes once the condition has moved into the stiff phase, which is an argument for not waiting months to seek help.
A short oral corticosteroid course using Deltasone (Prednisolone) is an alternative where injection is not available. It improves pain and motion over about six weeks, after which the advantage fades, and it needs care in diabetes because it raises blood sugar noticeably.
🧊 Phase two: now stretching earns its place
In the frozen phase the inflammation has largely settled and the restriction is mechanical. Pain is less sharp, and the priority reverses: sustained work at the end of the available range is what recovers motion.
- Little and often
- Short sessions three to five times a day work better than one long session. The capsule responds to repeated low-load stretch, not to force.
- Hold at the end range
- Take the movement to the point of stretch, not of sharp pain, and hold for 30 seconds. Discomfort during, settling within a few minutes afterwards, is the right dose. Pain that is still there hours later means too much.
- Work external rotation deliberately
- It is lost first and recovers last, and it is the movement people avoid because it feels useless. Using a stick or doorframe, with the elbow tucked in, gives the leverage.
- Warm the tissue first
- A hot shower or heat pack before the routine measurably increases the range achieved.
- Keep the rest of the arm working
- Grip, elbow and scapular muscles weaken quickly during months of limited use and slow the final recovery.
🏥 When progress stalls
- 💧 Hydrodilatation — fluid and steroid injected under pressure to distend and stretch the contracted capsule, done under imaging
- 😴 Manipulation under anaesthesia — the capsule is stretched while the patient is asleep. Effective, with a small risk of fracture or dislocation
- 🩺 Arthroscopic capsular release — the tight part of the capsule is cut through keyhole surgery. Reserved for cases that have not improved after a year, and intensive rehabilitation afterwards is what determines the result
🌱 Phase three: rebuilding what the months took
In the thawing phase movement returns on its own schedule. The work shifts to strength, because after a year of guarding the rotator cuff and the muscles that control the shoulder blade are considerably weaker than before.
Graded resistance work, starting with a light band and progressing slowly, restores the stability that protects the joint. Stretching continues alongside until the range stops improving. This is also when people return to overhead sport and lifting, and doing so gradually is what prevents a different shoulder problem from taking the place of this one.
📌 The other periarticular conditions
Periarthritis is a family, and the shoulder capsule is only its best-known member. The same principle applies to all of them: the joint surface is intact and the surrounding structures are inflamed.
| Condition | Where | Typical trigger |
|---|---|---|
| Trochanteric bursitis | Outer hip | Pain lying on that side; walking or stairs |
| Lateral epicondylitis | Outer elbow | Gripping and lifting with the palm down |
| De Quervain tenosynovitis | Thumb side of the wrist | Repetitive thumb use; common after childbirth |
| Pes anserine bursitis | Inner knee below the joint | Pain climbing stairs, worse in overweight adults |
| Achilles tendinopathy | Back of the ankle | Sudden increase in running volume |
Topical NSAIDs suit all of these particularly well, because the tissue is close to the skin and the drug reaches it directly. The deeper the structure, the less a gel achieves, which is one reason topical treatment works better at the elbow and knee than in the hip.
🚨 When shoulder pain is something else
- Pain with fever, redness and heat over the joint — possible infection, needs urgent assessment
- Inability to lift the arm at all after a fall — possible cuff tear or fracture
- Left shoulder pain with chest tightness, sweating or breathlessness — treat as cardiac until proven otherwise
- Numbness, tingling or weakness running down the arm — suggests a neck origin
- Both shoulders and both hips stiff in the morning, over 50, with fatigue — polymyalgia rheumatica should be excluded with blood tests
- Night pain with weight loss — always needs investigation
❓ Frequently asked questions
How long does frozen shoulder last?
Commonly one to three years in total: two to nine months of worsening pain, four to twelve months of stiffness, then five to twenty-four months of gradual recovery. Treatment shortens the painful phase and improves function but does not compress the whole course into weeks.
How do I know it is frozen shoulder and not a rotator cuff problem?
By passive movement. In frozen shoulder the arm will not rotate outwards even when someone else moves it, and it stops at a firm end point. With a rotator cuff problem passive movement is preserved and the limit is pain and weakness rather than a physical block.
Should I stretch through the pain?
Not in the painful first phase. Forcing an inflamed capsule increases inflammation and lengthens the course. Sustained end-range stretching belongs to the stiff second phase, when pain has settled and the restriction is mechanical.
Why is frozen shoulder so common in diabetes?
Risk is up to five times higher and 10 to 20 percent of people with diabetes are affected. Excess glucose is thought to alter collagen in the capsule, making it stiffer. Both shoulders are involved more often and the course tends to be longer and harder to treat.
Do steroid injections help frozen shoulder?
Yes, particularly in the painful phase, where an injection into the joint gives faster pain relief and better range of motion than exercise alone. The benefit is greatest early and diminishes once the shoulder has become stiff.
Does diclofenac gel work on the shoulder?
It helps with the surface inflammation and pain, applied two to four times daily with at least two weeks before judging it. It works better on shallow joints such as the elbow, knee and hand than on deep structures, so in the shoulder it is usually one part of the plan rather than the whole of it.
Why does it hurt most at night?
Lying down puts the capsule in positions it will not tolerate, there is no daytime distraction from the pain, and inflammatory activity rises overnight. Sleeping on the unaffected side with a pillow supporting the painful arm in front of the body usually helps.
Can it happen in the other shoulder?
Roughly one person in five develops it in the other shoulder at some point, and the rate is higher in diabetes. The same shoulder being affected twice is rare.
What if it does not improve after a year?
Options are hydrodilatation, where fluid and steroid distend the capsule under pressure, manipulation under anaesthesia, or arthroscopic capsular release. Rehabilitation afterwards largely determines the result of any of them.
Is complete rest the safest approach?
No. Immobility is one of the things that causes frozen shoulder in the first place, after a fracture or surgery. The aim is movement within the pain-free range during the painful phase, and progressive stretching once stiffness dominates.
📑 Sources and editorial
- Orthopaedic guidance on the diagnosis and staged management of adhesive capsulitis
- Trials comparing intra-articular corticosteroid injection, oral corticosteroids and physiotherapy in frozen shoulder
- Reviews of hydrodilatation, manipulation under anaesthesia and arthroscopic capsular release
- Epidemiological studies of frozen shoulder in diabetes and thyroid disease
- Prescribing information and topical NSAID efficacy reviews for diclofenac, naproxen and meloxicam
- Related reading: periarthritis explained, rheumatoid arthritis
- Related products: Voltaren (Diclofenac), Emulgel (Diclofenac 1%), Mobic (Meloxicam), Deltasone (Prednisolone), pain medicine category
- RXshop Editorial Team — reviewed by Daniel Kim, MD, Endocrinology
Medical Disclaimer: The information in this article is for educational and informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek guidance from a qualified healthcare provider with any questions you may have regarding a medical condition, and before starting, stopping or changing any medication.