There is no difference. Tendonitis and Tendinitis mean the same thing they are just spelled differently.

Tendonitis ends with an "itis" and this generally means inflammation. Technically, this means that tendinitis refers to tendon inflammation specifically although the word is often used in the public sphere to describe a tendon injury that often goes beyond the realm of inflammation.

Tendinopathy ends with a "pathy". Pathy means a disease or disorder. Tendinopathy is the term used by physicians to describe pretty much any problems with a tendon and has become more popular as the medical community has discovered that tendon injuries are more often caused by chronic overuse which results in tendon damage with little to no inflammation..

Tendinosis is the term the medical community uses to refer to tendon degeneration when there is no inflammation. To be more specific, the term tendinosis refers to a non-inflammatory, degeneration of the collagen fibers in a tendon. So basically tendinitis relates to tendon inflammation whereas tendinosis refers to tendon breakdown with no inflammation.

The break down of the collagen fibers is often caused by repetitive stress on the tendon fibers and the failure for the fibers to heal. In fact, the rate of tissue damage exceeds the healing process and eventually the build-up of damage on the tendon is not able to heal properly. The tissue (collagen fibers) degrade to a point where the once straight, strong, flexible bundle is weakened by abnormally formed fibers that look more like a mess of strands.

Since there is no inflammation with tendinosis you will not experience swelling, heat or redness. However, you will experience pain, tenderness and stiffness in the area where the tissue degeneration has occurred. This is the most common among Achilles tendon injuries.

Tendinopathy ends with a "pathy". Pathy means a disease or disorder. Tendinopathy is the term used by physicians to describe pretty much any problems with a tendon and has become more popular as the medical community has discovered that tendon injuries are more often caused by chronic overuse which results in tendon damage with little to no inflammation..

Calcific Tendinitis is an injury where bone (a calcium deposit) will grow in the middle of your tendon (instead of healthy tendon tissue). There are 2 types of calcific tendonitis and both are from a chemical reaction in the body. Degenerative Calcification happens from natural aging in our body where the tissues start to break down and injury happens then calcium (bone) forms in the tendon as it heals. With reactive calcification there's generally no injury or specific event the body, but a chemical process just starts to let calcium build-up inside the tendon. Normally reactive calcification affects younger people. Both forms of calcific tendinitis can happen in any tendon in the body, normally it forms in the shoulder and rotator cuff. This condition can also happen to the elbows, wrists, hands, hips, knees, or feet - it's also known as calcific tendinopathy

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During your recovery, you will probably have to modify and/or eliminate any activities that cause pain or discomfort at the location of your soft tissue injury until the pain and inflammation settle. The more diligent you are with your treatment and rehabilitation, the faster you will see successful results!