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Structure of tendonsThey are mainly formed by collagen, a very strong protein that is the main component of the tissues of the body support, other components are proteoglycans, proteins that allow you to have ability to deform and absorb impacts, as well as elastin which gives elastic properties.
Tendon length is variable, can range from a few millimeters to several centimeters. Some long tendons have a sheath surrounding providing protection during their movement, especially mechanical factors such as friction, it is known as tendon sheath, it is mainly in the flexor and extensor tendons located at the level of the hands and feet.
Difference between ligaments and tendonsTendons are part of the muscles, they correspond to its ends and its function is to allow that they insert into other structures such as bone to allow its movement, ligaments are bands of fibrous tissue that connect bones together keeping them fixed in order to stabilize the joint.
Tendons are frequent seat of injuryThe tendons can be affected by situations such as sudden efforts, direct trauma, overuse and even overtraining in sports. Tendon injuries can be of three types:
Tendinitis. It consists of the recent injury of tendon, it is very painful, is accompanied by increased volume, limitation for movement and rigidity.
Tendinosis. When tendinitis is not resolved, either because the proper treatment was not carried out or has failed to meet the required rest, it extends in time becoming a chronic injury that is known as tendinosis. In this condition there is a degenerative process of the fabric that makes up the tendon.
Tenosynovitis. In this lesion ignites only tendon and tendon sheath that covers it, this is very characteristic of inflammatory diseases such as rheumatoid arthritis, it is a very painful injury accompanied by significant swelling and stiffness.
Some tendons are injured more frequentlyWhile any tendon can be injured, some are particularly susceptible to be seat of disorders, as it is the case with the tendons of the shoulder rotator cuff-forming tendon known as patellar tendon knee and Achilles tendon located in the back of the ankle. These structures are usually subject to overload since they are involved in a large number of activities of daily living such as move and raise arms, move the knees, standing and walking.
Article contributed by the team of collaborators.