Osteoarthritis is the form of arthritis which is the most common in the knee.

medial joint line thinning of the knee

Narrowing of the joint line gap on the medial side in both knees, probably from removal of the meniscus.

medial joint line thinning in osteoarthritis of the knee

Narrowing of the joint line gap may precede the development of osteoarthritis on that side.


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).

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.

wear-and-tear arthritis

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.

Types of arthritis

Not all types of arthritis are the same.




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.

Micro-fragmented adipose tissue injection associated with arthroscopic procedures in patients with symptomatic knee osteoarthritis. Cattaneo G, De Caro A, Napoli F, Chiapale D, Trada P and Camera A. BMC Musculoskelet Disord. 2018; 19: 176..

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

See also:


man reading

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

Easy-to-read book about the alternatives to knee replacement in the younger patient.

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Webinar - Cell Therapy in Osteoarthritis.