There are many terms to describe various injuries to tendons which can be confusing to understand.
In simplified terms:
Tendinopathy refers to an overuse injury of a tendon.
Tendinosis refers to a non-inflammatory degeneration of a tendon, this term is often used instead of tendinopathy to mean more of less the same thing, especially during the later stages.
Tendonitis refers to inflammation of a tendon, this may occur in the early stages of a tendinopathy.
Tendon partial and complete rupture refers to tears in the tendon, these are more likely to occur in a tendon in which tendinopathy or tendinosis has occurred, but not always.
Let’s focus on tendinopathies as this is what we see most often in the clinic.