Quick answer. Frozen shoulder (adhesive capsulitis) is inflammation, thickening and tightening of the shoulder joint capsule that causes pain and progressive stiffness, with markedly reduced range of motion. It typically affects people aged about 40-60, is more common in women and is strongly linked with diabetes. It passes through three stages – freezing, frozen and thawing – usually resolving over many months to a couple of years. Treatment includes pain relief, physiotherapy and stretching, corticosteroid injections (especially helpful in the painful early stage), and procedures such as hydrodilatation, manipulation under anaesthesia or arthroscopic capsular release for stubborn cases. See a GP, physiotherapist or orthopaedic specialist for assessment.
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Frozen shoulder, known medically as adhesive capsulitis, is a common cause of a stiff, painful shoulder in Singapore, particularly in middle-aged adults and people with diabetes. The good news is that it usually improves over time, and pain relief, physiotherapy and targeted injections can make the journey much more comfortable. This guide explains what frozen shoulder is, why it happens, its three classic stages and the treatments available locally.
At a glance
| Stage / treatment | What it involves | Notes |
|---|---|---|
| Freezing stage | Gradual, worsening pain (often worst at night) with increasing stiffness | Typically about 6-12 weeks; pain relief and steroid injection most helpful here |
| Frozen stage | Pain eases but stiffness dominates; shoulder most restricted | Often around 4-6 months; physiotherapy to maintain movement |
| Thawing stage | Gradual return of movement and easing of pain | Can extend over a year; overall recovery often months to ~2 years |
| Physiotherapy & injections | Guided stretching, pain medication, corticosteroid injection | First-line; stay within physiotherapist's guidance |
| Hydrodilatation | Sterile fluid injected to expand and stretch the capsule | Non-surgical option for stubborn stiffness |
| Manipulation / arthroscopic release | Adhesions broken under anaesthesia, or keyhole capsular release | Reserved for cases unresponsive to conservative care; needs rehab |
What is frozen shoulder (adhesive capsulitis)?
Frozen shoulder is a condition in which the capsule of connective tissue surrounding the shoulder joint becomes inflamed, thickened and tight. As described by HealthHub and SingHealth, this inflammation makes the capsule fibrotic and “sticky”, reducing the space within the joint and progressively limiting movement.
The result is pain combined with marked stiffness. Everyday actions become difficult or impossible – reaching overhead, putting on a jacket, washing your hair, reaching into a back pocket or fastening a bra behind your back. Movement is often painful, and the loss of motion affects both your own efforts to move the arm and another person trying to move it for you.
Who gets it and why
Frozen shoulder most commonly affects adults aged about 40-60 (SingHealth notes a range of roughly 40-70) and is uncommon in younger people. It is more common in women than men.
The strongest medical association is with diabetes. People with diabetes are at considerably higher risk of developing frozen shoulder and may experience more severe or prolonged disease that can be slower to respond to treatment. Other risk factors include thyroid problems and other endocrine disorders, cardiac disease and Parkinson’s disease. Frozen shoulder can also follow a period of shoulder immobility – for example after an injury, fracture, stroke or surgery when the arm has been rested for a long time. In many cases, however, no clear cause is found (so-called primary frozen shoulder).
The three stages of frozen shoulder
Frozen shoulder classically progresses through three overlapping stages. Timeframes vary between individuals, but the pattern is consistent:
- Freezing stage: Pain develops gradually and worsens, often worst at night and disturbing sleep. The shoulder becomes increasingly stiff. SingHealth gives a typical duration of around 6-12 weeks.
- Frozen stage: Pain often eases, but stiffness dominates and the shoulder is at its most restricted, limiting daily activities. This phase commonly lasts around 4-6 months.
- Thawing stage: Movement gradually returns and pain continues to settle. This recovery phase can extend over a year or more.
Overall, frozen shoulder often resolves over many months to a couple of years. It tends to be self-limiting, but recovery can be slow, which is why supportive treatment matters.
How it is diagnosed
Diagnosis is mainly clinical – a doctor takes your history and examines the shoulder, looking for the characteristic loss of both active movement (your own) and passive movement (when the examiner moves your arm) in multiple directions. This pattern helps distinguish frozen shoulder from other shoulder problems.
Imaging is not always needed but may be used to exclude other causes. According to SingHealth, an X-ray or MRI can help rule out conditions such as arthritis or a rotator cuff tear. New severe shoulder pain, or pain following trauma such as a fall, should always be assessed to exclude other injuries before assuming frozen shoulder.
Treatment options in Singapore
Treatment aims to relieve pain and restore movement, and most people improve without surgery. Options range from simple measures to procedures for stubborn cases:
- Pain relief: Anti-inflammatory and other pain medications, especially helpful in the painful early stage.
- Physiotherapy and stretching: Guided exercises to maintain and gradually restore range of motion. It is important to stay within a physiotherapist’s guidance – overly aggressive stretching during the painful phase can aggravate symptoms.
- Corticosteroid injections: A steroid injected into the joint can reduce pain and inflammation and is particularly useful in the painful early (freezing) stage.
- Hydrodilatation: A larger volume of sterile fluid (often with steroid and local anaesthetic) is injected to expand and stretch the tight capsule.
- Manipulation under anaesthesia: The surgeon gently moves the arm while you are anaesthetised to break up adhesions, with no incisions.
- Arthroscopic capsular release: Keyhole surgery in which the tight portions of the capsule are released; SingHealth notes this is the most commonly used surgical technique, followed by intensive rehabilitation.
For diabetic frozen shoulder that does not respond to conservative care, studies in Asian patients have reported favourable outcomes from arthroscopic capsular release.
Who to see and when
A sensible starting point is your GP, who can assess the shoulder, advise on pain relief and refer you onward. A physiotherapist guides exercises and stretching, while an orthopaedic specialist manages injections, hydrodilatation and surgical options when needed. SingHealth advises seeking medical advice early, as timely intervention can help prevent severe stiffness.
Seek prompt assessment for new severe shoulder pain, pain after a fall or injury, or symptoms that are not improving, so that other causes can be excluded and the right treatment started.
Related guides
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- orthopaedic clinics directory
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Sources
- HealthHub (MOH) – Frozen Shoulder
- SingHealth – Frozen Shoulder: Conditions & Treatments
- SingHealth – Sports Related Injury: Frozen Shoulder
- Singapore Medical Journal – Physical therapy in the management of frozen shoulder
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- Rheumatoid Arthritis in Singapore
- Rotator Cuff Injuries & Shoulder Pain in Singapore
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