Tendonitis (formally tendinitis), meaning inflammation of a tendon (the suffix "itis" means "inflammation"), is a type of tendinopathy often confused with the more common tendinosis, which has similar symptoms but requires different treatment.
The term tendinitis should be reserved for tendon injuries that involve larger-scale acute injuries accompanied by inflammation. Generally tendinitis is referred to by the body part involved, such as Achilles tendinitis (affecting the Achilles tendon), or patellar tendinitis (jumper's knee, affecting the patellar tendon).
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Last Updated: Sep 15, 2014