page_title: Osteoarthritis
hierarchical_section_title: Osteoarthritis
caption_attribution_description: English: Osteoarthritis of the left knee. Note the osteophytes, narrowing of the joint space (arrow), and increased subchondral bone density (arrow).
context_page_description: Osteoarthritis normally affects older people: it is a disease where joints wear out. As the joint surface wears away, it sheds particles which stimulate the joint lining to produce fluid. This causes the joint to swell. When the joint cartilage wears away, the core of the bone becomes exposed. The exposed bone rubs against other exposed bone.
context_section_description: Osteoarthritis normally affects older people: it is a disease where joints wear out. As the joint surface wears away, it sheds particles which stimulate the joint lining to produce fluid. This causes the joint to swell. When the joint cartilage wears away, the core of the bone becomes exposed. The exposed bone rubs against other exposed bone.
caption: X-ray of knee with osteoarthritis.
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