Osteoarthritis
Degeneration of the joint surfaces can affect one compartment or several parts of the knee.
Knee Assessment
Knee Pain & Knee Arthritis
Knee pain has many causes. The first step is to establish the likely diagnosis and understand how symptoms are affecting your life before choosing treatment.
Assessment before treatmentDiagnosis · options · shared decision-making
Quick Answer
When is knee pain worth assessing?
Persistent pain, swelling, stiffness, loss of confidence on stairs or a reduction in walking and activity are common reasons to seek assessment.
Knee osteoarthritis commonly causes
- activity-related pain
- stiffness, particularly after rest
- swelling or reduced movement
- difficulty with stairs, walking or prolonged standing
- progressive change in leg alignment in some people
Diagnosis
Not every painful knee needs surgery
The pattern of pain, examination and appropriate imaging help distinguish osteoarthritis from other causes of knee symptoms.
Meniscal or soft-tissue problems
Symptoms may arise from structures around the knee and can require a different management approach.
Referred or inflammatory pain
Less commonly, symptoms may relate to another joint or an inflammatory condition that needs further investigation.
How is knee osteoarthritis assessed?
NICE advises that osteoarthritis can often be diagnosed clinically in adults aged 45 or over with activity-related pain and either no morning stiffness or morning stiffness lasting no more than 30 minutes. X-rays can help define the pattern and severity of arthritis when they are likely to influence treatment.
What treatments may be considered?
Evidence-based care may include education, therapeutic exercise, weight management where appropriate, medicines, walking aids and selected injection treatments. Choice depends on the diagnosis, health, previous treatment and patient preference.
Read the knee osteoarthritis treatment guide →
When might knee replacement be considered?
Knee replacement may be considered when symptoms and functional limitation are substantially affecting quality of life and appropriate non-surgical treatment is ineffective or unsuitable. The decision is based on the whole clinical picture rather than a scan alone.
When is urgent assessment needed?
A hot, markedly swollen knee with fever or feeling unwell, inability to bear weight after significant injury, or rapidly worsening symptoms may require urgent NHS assessment rather than a routine private appointment.
Evidence & Further Reading
UK guidance used for this page
General information only; diagnosis and treatment need individual assessment.
NICE NG226 — Osteoarthritis in over 16s
Diagnosis, exercise, weight management, medicines and referral for joint replacement.
View NICE guidance →NHS — Knee replacement
When replacement may be considered, the procedure, recovery and complications.
View NHS information →Common Questions
Knee pain FAQs
Do I need an MRI for knee arthritis?
Usually not. Weight-bearing X-rays are often more useful when osteoarthritis is suspected. MRI may be used when the diagnosis is uncertain or another problem is being considered.
Does arthritis always get worse until I need a replacement?
No. Symptoms and progression vary widely. Many people manage well with non-surgical treatment for long periods.
Can I discuss injections without committing to surgery?
Yes. An assessment should consider all reasonable options. Surgery is recommended only when it is appropriate to the diagnosis and circumstances.
