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3. How does inflammation begin?

Tendon sheaths are fluid-filled tubes that protect the tendon from being worn down by repetitive use. The fluid in the sheath allows the tendon to glide smoothly without harmful friction. However, if there is too much strain on the tendon sheath, it may become inflamed over time. The repetitive nature of a routine action, such as playing the piano over long periods of time, is often what causes this result.

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