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Arthritis Today

Glossary L

Browse the glossary by selecting a letter or by entering an arthritis-related term:

Lateral collateral ligament (LCL)

The ligament that runs along the outside of the knee joint, providing stability to the outer (lateral) part of the knee.

Ligaments

Tough bands of connective tissue that attach bones to bones and help keep them together at a joint.

Lumbar spine

The lower back, composed of five vertebrae.

Lupus

An autoimmune disease that occurs primarily in women and affects many organs and organ systems, including the skin, joints, heart and blood vessels, kidneys and brain.

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Lymphocytes

A type of white blood cell involved in the immune system.

Predict Your Joint Pain
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Predict your joint pain level based on the local weather.

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