you have had a fall
That depends on how hard you fall and on what surface. The injury could be anything from a small bruise that will heal shortly to very serious knee damage resulting in micro fracture knee surgery.
If you have a big bump below your knee after a fall, it's important to rest the area and avoid putting weight on it. Apply ice for 15-20 minutes every hour to reduce swelling and pain. Over-the-counter pain relievers can help as well. If the bump persists, is very painful, or you have difficulty moving your knee, consider seeing a healthcare professional for further evaluation.
When you bump your knee (or other body parts) there is some damage to the various tissues involved. The body has two main types of fluids that constantly circulate, which are blood and lymph. When there is damage to the body, these fluids tend to leak out of their normal pathways and vessels, and to pool in the damaged area. Bumps are formed as a result of added fluid. Eventually the excess fluid will be reabsorbed into its normal circulation, and the bump will heal.
A small amount of fluid build up at the joint, possilby a sign of slight arthritis, mild gout or a moderate physical trauma ( for example a fall onto the knee).
either your knee hits it into neutral or you hit the bump to fast and it pops forward.
it might be a tumor. you should go to a specialist.
proximal epiphisis tibial tubarosity
A big bump below your knee could be due to various reasons such as injury, inflammation, cysts, or growths. To determine the cause and appropriate treatment, it is important to consult a healthcare professional for evaluation and diagnosis.
A knee can be broken through direct trauma, such as a hard impact or force applied to the knee joint. This can result in a fracture of one of the bones in the knee, such as the patella (kneecap), femur, or tibia. Treatment for a broken knee usually involves immobilization, pain management, and possibly surgery.
Technically, your knee is not comprised of just one bone. It's a joint, which allows movement. The femur and then the tibia and fibula meet under the kneecap, which is known as the patella. There are arteries, veins and nerves that are located alongside and on top of the knee joint. If these are injured in any way, it is a surgical emergency, and could possibly lead to death. The purpose of the patella is to protect the arteries, veins and nerves, and in turn, protecting a person's life.
It's common and it's similar to 'water on the knee.' When the body becomes dehydrated, particularly hot or the person is standing for a long length of time this can cause 'water on the knee.' In the case of the bump on your head you have something similar, but, anything to do with the head should be checked out by a specialist to be sure there is no other injuries to the head. Please don't assume this is like water on the knee and do nothing about it. Any bump or lump should be checked out by your doctor and generally everything is just fine and it will put your mind to rest.