Healthy Joint vs Osteoarthritis
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Healthy Joint vs. Osteoarthritis
Source: U.S. Department of Health and Human Services, National Institutes of Health, National Institute of Arthritis and Musculoskeletal and Skin Diseases. www.niams.nih.gov
In a healthy joint, the ends of bones are encased in smooth cartilage. Together, they are protected by a joint capsule lined with a synovial membrane that produces synovial fluid. The capsule and fluid protect the cartilage, muscles, and connective tissues.
With osteoarthritis, the cartilage becomes worn away. Spurs grow out from the edge of the bone, and synovial fluid increases. Altogether, the joint feels stiff and sore.
A Healthy Joint
A Joint With
Severe Osteoarthritis
Cartilage
Bone
Synovial
fluid
Worn-away
cartilage
fragments
in fluid
Bone
spurs
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