Osteoarthritis is the most common form of knee arthritis.


The progression of osteoarthritis in the knee

Usually knee osteoarthritis begins in one part of the knee (what we call a 'compartment'), and only later does it progress to involve the other compartments. This gives the patient the option to try to arrest progression by suitable intervention.


Classical signs and symptoms of osteoarthritis

Classical symptoms include pain at rest, reduced exercise tolerance, joint swelling.

Classical imaging signs include joint line narrowing, bone spurs, bone cysts, areas of increased bone denisty (sclerosis).

medial joint line thinning of the knee medial joint line thinning in osteoarthritis of the knee unicompartmental knee replacement
Narrowing of the joint line gap on the medial side in both knees, probably from removal of the meniscus Narrowing of the joint line gap may precede the development of osteoarthritis on that side. Unicompartmental knee replacement for a damaged medial compartment.
wear-and-tear arthritis

A simple flowchart with links to show the possible interventions in cases of knee arthritis.

Discussion of factors causing arthritis pain to precede X-ray changes.

Joint Cartilage & Osteoarthritis

Papers about joint cartilage problems in the knee, delivered at a very basic level.

An 'interpretation' of a 2009 paper looking at the factors that increase the likelihood of developing osteoarthritis after cruciate ligament injury.

The concept of arthritis compartments

An overview to help the reader understand issues of arthritis.

Arthritis cysts and spurs

Signs of arthritic destruction.




Determinants of pain in patients with symptomatic knee osteoarthritis. Heidari B, Hajian-Tilaki K, Babaei M. Caspian J Intern Med. 2016 Summer;7(3):153-161.

Current Surgical Treatment of Knee Osteoarthritis. Rönn K, Reischl N, Gautier E and Jacobi M. Arthritis. 2011; 2011: 454873.

See also:


eBook - Knee arthritis interventions when you are too young for a total knee replacement

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Webinar - The Magic of Fat Cells.

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Webinar - Cell Therapy in Osteoarthritis.