Bursitis of the knee can occur when the bursa fills with blood from injury and overuse, such as from athletic competition. Bursitis can also occur from rheumatoid arthritis and from deposits of crystals, as seen in patients with gouty arthritis and pseudogout.
The lateral collateral ligament (LCL) is the ligament located in the knee joint. Ligaments are thick, strong bands of tissue that connect bone to bone. The LCL runs along the outside of the knee joint, from the outside of the bottom of the thighbone to the top of the lower-leg bone .
Another type of knee pain caused by tendinitis is called jumper’s knee. In this type of tendinitis, injury to the knee occurs with jumping activities when too much strain is placed on the patellar tendon, which connects the kneecap (patella) to the shinbone. Pain is felt directly over the patellar tendon.