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The patellar tendon is a strong, flat ligament, which originates on the apex of the patella distally and adjoining margins of the patella and the rough depression on its posterior surface; below, it inserts on the tuberosity of the tibia; its superficial fibers are continuous over the front of the patella with those of the tendon of the quadriceps femoris.
Patellar tendinitis is an overuse injury from repetitive overloading or repetitive stress of the patellar tendon of the knee leading to microtears and inflammation that do not have time to heal before the next use. Patellar tendonitis is common in athletes who participate in activities that include a lot of jumping, changing directions, or running.
Patellar tendon rupture is a tear of the tendon that connects the knee cap (patella) to the tibia. [1] Often there is sudden onset of pain and walking is difficult. [ 1 ] In a complete rupture, the ability to extend that knee is decreased. [ 1 ]
The subcutaneous prepatellar bursa is located in front of the patella. The [deep] infrapatellar bursa is located under the patella, between the patellar ligament and the fibrous membrane of the joint capsule. It is communicating with the joint space in particular cases.
The condition may result from acute injury to the patella or chronic friction between the patella and a groove in the femur through which it passes during knee flexion. [11] Possible causes include a tight iliotibial band, neuromas, bursitis, overuse, malalignment, core instability, and patellar maltracking. [citation needed]
The patella is found in many tetrapods, such as mice, cats, birds and dogs, but not in whales, or most reptiles. In humans, the patella is the largest sesamoid bone (i.e., embedded within a tendon or a muscle) in the body. Babies are born with a patella of soft cartilage which begins to ossify into bone at about four years of age.