Knee · Osteoarthritis · Flagship guide
Pain and an X-ray do not make the decision for you. A useful plan begins with how your knee affects your life, what you want to regain, and which options fit your health and preferences.
Choose your reading depth ↓One condition · Four depths
The 60-second explanation
It may cause activity-related pain, stiffness, swelling, reduced confidence and limits in daily life. Symptoms and function matter more than the image alone. Exercise is core treatment, and surgery is a shared decision when suitable non-surgical care has not helped enough.
Continue with the public journey →The clinical learning map
In adults aged 45 or over, activity-related joint pain with no morning stiffness or stiffness lasting no more than 30 minutes can support a clinical diagnosis. Learn to separate a typical presentation from trauma, infection, inflammatory disease, referred pain and other diagnoses.
Study diagnosis and red flags →The practice lens
Use clinical assessment and shared decision-making; avoid allowing radiographic severity or one score to replace the person’s symptoms, function and preferences. Combine core non-pharmacological care with selected symptom support and planned review.
Review the decision architecture →The evidence frontier
Important questions span synovial and cartilage biology, subchondral bone, pain sensitisation, biomechanical loading, muscle, adiposity, ageing, phenotyping, causal inference, outcome selection and translation from group effects to individual decisions.
Open the source and uncertainty layer →01 · Overview
An image can support a diagnosis, but it cannot fully describe pain, sleep, confidence, walking, work or the life you want to regain.
Tailored therapeutic exercise is core care. Discomfort may increase briefly when starting, so progression, support and review matter.
There is no universal treatment ladder. Education, exercise, weight support, aids and symptom treatments can be combined and adapted.
Replacement becomes worth discussing when symptoms substantially affect quality of life and suitable non-surgical care is ineffective or unsuitable.
02 · Diagnosis
Often, not immediately.
According to NICE, osteoarthritis can often be diagnosed clinically in people aged 45 or over when pain is related to activity and morning stiffness is absent or lasts no longer than 30 minutes. Routine imaging is not usually needed for a typical presentation.
Imaging or further tests may help when features are atypical, another diagnosis is suspected, important trauma occurred, symptoms change unexpectedly, or surgery is being planned. Images should be interpreted alongside symptoms and examination.
03 · Care options
This is a conversation map, not a prescription. Medicines and procedures require individual assessment of benefits, risks, other conditions and other medicines.
Agree a tailored strengthening and aerobic programme. Supervision may help technique, confidence, adherence and progression.
If someone is overweight or living with obesity, sustained weight loss can help symptoms and function. Goals and support should be realistic and respectful.
When medication is needed for knee OA, guidelines commonly favour a topical non-steroidal anti-inflammatory medicine first. Oral options require medical risk assessment.
A walking aid can improve stability for some people. A corticosteroid injection may provide short-term relief, sometimes to enable exercise or a specific recovery goal.
04 · Shared decision
Referral can be considered when pain, stiffness, reduced function or progressive deformity substantially affects quality of life and suitable non-surgical care is ineffective or unsuitable.
Structural severity contributes to the picture; it does not make the decision alone.
Assessment and shared decision-making should not be replaced by a single numerical threshold.
NICE says people should not be excluded from referral solely because of age, sex or gender, smoking, comorbidities, or overweight and obesity.
Benefits, limitations, risks, preparation and recovery should be considered against the activities that matter to you.
05 · Care journey
Describe pain, stiffness, swelling, sleep, walking, work, sport and the activities you most want to regain.
Choose goals such as stairs, a daily walk, prayer positions, work, caring for family, or returning to an activity.
Combine education and exercise with weight support, aids or medication when appropriate.
Agree when and how to review. If the plan is ineffective or difficult to follow, return and adapt it.
If daily life remains substantially limited, ask whether specialist assessment—including a replacement discussion—is appropriate.
Continue strength, activity, recovery and wider health work whether treatment is non-operative or surgical.
06 · Evidence & uncertainty
Status: evidence-checked draft awaiting documented clinical review. Recommendations vary by health system and change over time.
Diagnosis, core treatment, medicines, follow-up, referral and arthroscopy · Published 2022.
Evidence-based clinical practice guideline · Published 2021.
Hand, hip and knee management recommendations · Published 2019.
Patient information on indications, procedure, risks and recovery.
Guidelines differ in how they judge individual treatments. Average treatment effects do not guarantee an individual response. Local availability, comorbidity, preferences, cost, adherence and care quality all influence real-world decisions.