The concept of the kinetic chain came about in the year 1875. A mechanical engineer named Franz Reuleaux stated that if a series of overlapping segments were connected via joints, these pain in hip flexor would create a system that would allow the movement of one joint to affect the movement of another joint within the kinetic link. It is usually assumed that having knee pain is because of a problem with the knee joint. This may not always be true. The kinetic chain theory can explain how an injury to one part of the body can lead to pain or discomfort in another part. Knee pain can be due to a knee condition or a pinched nerve in your lower back.
The nerves that give the sensation of pain to the lower body are found in the lower back. Sometimes because of a bulge in the discs located between the vertebrae, these transmitting nerves are pressed upon. A pinched or pressed nerve sends out pain signals in distress. The magnitude of the pain depends on how much the bulge press's the nerve.
The second, third, and fourth vertebral discs lie in the lower back area, which is responsible for sending signals to the knee. A disc bulge in the lower back causes lower back pain and also can lead to knee pain, proving the kinetic chain theory accurate.