The knee joint is one of the strongest and most important joints in the human body. It allows the lower leg to move relative to the thigh while supporting the body’s weight. Movements at the knee joint are essential to many everyday activities, including walking, running, sitting and standing.

The static stability of the knee joint complex depends on four major knee ligaments, which provide a primary restraint to abnormal knee motion

  • Anterior cruciate;
  • Posterior cruciate;
  • Medial collateral;
  • Lateral collateral.

There are four main movements that the knee joint permits:

  • Extension:  Produced by the quadriceps femoris;
  • Flexion: Produced by the hamstrings, gracilis, sartorius and popliteus;
  • Lateral rotation: Produced by the biceps femoris;
  • Medial rotation: Produced by five muscles; semimembranosus, semitendinosus, gracilis, sartorius and popliteus.


Knee problems are very common, and they occur in people of all ages. Knee problems can interfere with many things, from participation in sports to simply getting up from a chair and walking. This can have a big impact on your life.

The most common disease affecting the knee is osteoarthritis. The cartilage in the knee gradually wears away, causing pain and swelling.

Injuries to ligaments and tendons also cause knee problems. A common injury is to the anterior cruciate ligament (ACL). You usually injure your ACL by a sudden twisting motion. ACL and other knee injuries are common sports injuries.

For all these reasons, it is important to take care of your knee. Compare the power of extensor muscles and flexor muscles, the flexibility of the back chain and the physiological range of movement.
The Tecnobody devices can evaluate, improve and train the knee joint.
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