In 40 seconds
Bursae are small fluid-filled sacs that cushion bones, tendons and muscles around joints. Bursitis is their inflammation — most commonly affecting the shoulder, elbow (olecranon), hip (trochanteric) and knee (prepatellar). UK first-line care follows NICE CKS guidance: relative rest, NSAIDs, ice, gentle range-of-motion work, occasional aspiration or steroid injection. PEMF is a non-pharmacological adjunct that reduces local inflammation and supports microcirculation. Septic bursitis is a hard exclusion — the bursa fluid must be cultured before any anti-inflammatory work begins.
Quick facts
- Common locations: Shoulder, elbow (olecranon), hip (trochanteric), knee (prepatellar)
- Standard care: Relative rest, NSAIDs, ice, gentle ROM per NICE CKS
- Best PEMF evidence for: Non-septic bursitis pain reduction, faster swelling resolution
- Sessions: 30–40 minutes, 2–3× per week for 4–6 weeks
- Hard exclusion: Septic bursitis — must be ruled out by aspiration if suspected
- Avoid: Repeated steroid injection (more than 2–3 in a year)
What bursitis actually is
The body has roughly 150 bursae — small fluid-filled sacs that sit between bones, tendons and muscles, allowing them to glide smoothly past one another during movement. When a bursa becomes inflamed (from repetitive friction, direct trauma, infection, or systemic inflammatory disease), it produces the classic bursitis picture: localised pain, swelling, warmth, and reduced movement.
The most clinically important locations:
- Subacromial (shoulder) — frequently mistaken for rotator cuff problems; often co-occurs.
- Olecranon (elbow tip) — the classic "Popeye elbow" swelling. Often follows direct trauma.
- Trochanteric (lateral hip) — pain on the outside of the hip, worse lying on that side at night.
- Prepatellar (front of knee) — "housemaid's knee", from prolonged kneeling.
UK first-line management follows NICE CKS: relative rest, NSAIDs, ice, gentle range-of-motion exercises. Aspiration and steroid injection are second-line for refractory cases. If the bursa is hot, red, the patient is unwell, or there's a history of skin breakdown over the bursa, septic bursitis must be excluded by aspiration before any anti-inflammatory treatment.
How PEMF may help bursitis
- Inflammation reduction — bursitis pain is largely chemical (inflammatory mediators in the bursa fluid), not mechanical. PEMF down-regulates the relevant cytokines.
- Microcirculation support — better local blood flow accelerates clearance of inflammatory mediators and excess fluid.
- Pain modulation — pulsed magnetic fields appear to alter pain-fibre firing thresholds around the inflamed area.
- Return-to-activity tolerance — bursitis recovery requires gradual reintroduction of the activity that often caused it. PEMF helps patients tolerate that work.
- Avoiding steroid injection cycles — repeated steroid injection has known soft-tissue effects. PEMF is one of several non-injection options worth trying first.
Typical UK protocol
| Phase | Frequency | Duration | Goal |
|---|---|---|---|
| Acute (weeks 0–2) | 2–3× per week | 2 weeks | Inflammation reduction, pain relief |
| Resolution (weeks 2–6) | 1–2× per week | 4 weeks | Restore function, address contributing factors |
| Maintenance | As needed | Ongoing | Prevent recurrence |
Many bursitis cases resolve in 4–6 weeks. If symptoms persist beyond this, return to your GP — a different diagnosis (calcific tendonitis, septic bursitis, systemic inflammatory disease) may be at play.
Septic bursitis — when not to use PEMF
Septic bursitis (infection of the bursa, typically Staph aureus) is a different condition that requires antibiotics, not anti-inflammatory work. Suspect septic bursitis if any of:
- Fever or feeling generally unwell
- Skin over the bursa is broken, red or hot
- Rapidly worsening pain disproportionate to the swelling
- Recent skin laceration or insect bite over the affected area
- Diabetes or immune compromise
If any of these apply, see your GP urgently. The bursa needs aspirating and culturing before any anti-inflammatory treatment (PEMF, NSAIDs, steroid injection) is appropriate.
Practical advice before booking
- Get a diagnosis first — bursitis can mimic tendinopathy, joint effusion, septic arthritis, calcific tendonitis. A GP or sports physio assessment matters.
- Identify and modify the trigger — kneeling pads for prepatellar, modified shoulder loading for subacromial, weight loss + side-sleeping change for trochanteric.
- Avoid repeated steroid injection — more than 2–3 in a year has known cumulative soft-tissue effects.
- Septic bursitis = hard exclusion — see above.
Related guides on PEMF UK
PEMF for frozen shoulder
Different condition but often co-presents with subacromial bursitis.
AdjacentPEMF for tendinopathy
Tendinopathy and bursitis frequently coexist around joints.
AdjacentPEMF for knee osteoarthritis
Knee bursitis often co-exists with arthritic change.
Contraindications
Hard exclusions — do not have PEMF if any apply:
- Pacemaker, implantable cardioverter-defibrillator (ICD), or any cardiac electronic device
- Cochlear implant or other implanted electronic hearing device
- Spinal cord stimulator, deep-brain stimulator, vagus nerve stimulator
- Intrathecal pump or implanted drug pump
- Insulin pump (continuous glucose monitors are usually fine — confirm with the clinic)
- Active infection at the treatment site
- Pregnancy — when treatment would be over the abdomen, lumbar spine, or pelvis
Discuss with your GP or specialist before booking if any apply:
- Active malignancy or recent cancer history (oncologist clearance required)
- History of seizures or epilepsy
- Multiple sclerosis or other neurological condition under specialist care
- Anticoagulant therapy (PEMF itself does not thin blood, but bruising risk if local circulation is already compromised)
- Children under 14 (most UK clinics will not treat under-18s without paediatric specialist input)
- Recent surgery within the last 14 days at the treatment site (confirm with surgeon)
NOT contraindications — these are commonly misunderstood:
- Plates, rods, screws and other passive metal orthopaedic hardware
- Dental implants and dental crowns
- Joint replacements (hip, knee, shoulder)
- IUDs (copper or hormonal)
- Tattoos and piercings (jewellery should be removed for the session)
Specific to this condition: Septic bursitis is a hard exclusion until the infection is fully treated. If you have any signs of infection (fever, unwell, hot/red/broken skin over the bursa, rapidly worsening pain) see your GP urgently — the bursa must be cultured before any anti-inflammatory work begins.
Frequently asked questions
Will PEMF resolve my bursitis?
Most non-septic bursitis resolves in 4–6 weeks with relative rest, NSAIDs and gradual return to activity. PEMF supports faster swelling resolution and may help patients tolerate the return-to-activity work that prevents recurrence.
How do I know if it's septic?
Septic bursitis usually presents with fever, feeling unwell, hot and red skin over the bursa, and disproportionate pain. Diabetes and immune compromise raise the risk. Any of these signs warrant urgent GP assessment and aspiration before any anti-inflammatory treatment.
Should I have a steroid injection?
Steroid injection is reasonable for refractory bursitis after a course of conservative care, but repeated injection (>2–3 per year) has known soft-tissue effects. PEMF is one of several non-injection options worth trying first.
Why do I keep getting it?
Recurrent bursitis usually points to an unaddressed cause — repetitive activity, poor mechanics, occupational kneeling, hip muscle weakness, sleeping position. Without addressing the cause, recurrence is likely regardless of treatment.
Can I have PEMF on the day my bursa is aspirated?
Best to wait until the aspiration site has closed (24–48 hours) and culture results are back excluding infection. Then proceed.
What's the UK cost?
Typical UK private clinic pricing is £40–£90 per session. A 4–6 week course costs £300–£600 in total.
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