Does your knee hurt?

Find out why with our algorithm.

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Clinical disclaimer: This algorithm is a decision-support tool and does not replace individualised clinical assessment. Recommendations should always be interpreted in context by the treating physician. If in doubt, consult an orthopaedic specialist.

Frequently asked questions

I have knee pain — when should I see a specialist?
Seek assessment if pain lasts more than 2–3 weeks, if there was trauma with swelling, if the knee locks, gives way or cannot bear weight, or if there is redness and fever. Early assessment prevents treatable problems (meniscus, ligaments, cartilage) from progressing.
Does knee pain always mean osteoarthritis?
No. Knee pain has many causes — meniscus, ligament (ACL) or cartilage injuries, tendinopathies, patellar instability, or pain referred from the hip/spine. The correct diagnosis depends on history, examination and, when needed, imaging.
How much does knee surgery cost?
The cost depends on the treatment pathway. SIGIC (Portuguese NHS): with a surgery voucher, the procedure is fully covered — no cost to the patient. Health insurance / subsystems: contracted surgery, according to your plan. Private: a personalised quote — as a guide, from €3,000 for arthroscopy (meniscus, ligaments or cartilage), from €4,000 for anterior cruciate ligament (ACL) reconstruction and from €8,000 for knee replacement. Final prices depend on the clinical case, hospital and implants. For an exact quote, book an appointment or see prices & quotes.
Dr. Nuno Camelo Barbosa
Dr. Nuno Camelo Barbosa
Orthopaedic surgeon · Knee surgery subspecialty
Peer reviewer (AJSM · KSSTA · OJSM · JEO)
Last medically reviewed: 24 July 2026
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