The word “antagonist” is a derivative of the Greek word antagonistēs, which translates into some form of opponent or competitor, and which stems from a combination of the words anti- (“against”) and agonizesthai (“to contend for a prize”). So when you take origins into account, you’d be correct to suspect that an antagonist’s muscle is something to fight against.
A hairline kneecap fracture is a simple crack in the bone (the patella is still in one piece). Hairline fractures are also known as stress fractures and are rare in the kneecap. They can occur in athletes, such as marathon runners, and may be due to overuse. A stress fracture of the patella may be difficult to see on an X-ray. The main symptom is a pain in the front of the knee that gets worse over time.
Insertional Achilles tendinitis involves the lower portion of the heel, where the tendon attaches (inserts) to the heel bone. In both non insertional and insertional Achilles tendinitis, damaged tendon fibers may also calcify (harden). Bone spurs (extra bone growth) often form with insertional Achilles tendinitis. Insertional Achilles Tendinitis is pain and inflammation at the insertion of the Achilles Tendon on the heel bone. It is often associated with swelling, redness, and calcium buildup (small bump) located at the back of the heel (see picture). Pressure at the back of the heel tends to be sensitive and painful. In the clinic, some of my clients often report that certain tight shoes might cause more pain in this area from the pressure and have to sometimes resort to open back shoes.
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