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In the adult the articular surface is about 12 cm 2 (1.9 sq in) and covered by cartilage, which can reach a maximal thickness of 6 mm (0.24 in) in the centre at about 30 years of age. Owing to the great stress on the patellofemoral joint during resisted knee flexion, the articular cartilage of the patella is among the thickest in the human body.
The knee is a modified hinge joint, a type of synovial joint, which is composed of three functional compartments: the patellofemoral articulation, consisting of the patella, or "kneecap", and the patellar groove on the front of the femur through which it slides; and the medial and lateral tibiofemoral articulations linking the femur, or thigh bone, with the tibia, the main bone of the lower ...
[2] [4] Pain may worsen with sitting down with a bent knee for long periods of time, excessive use, or climbing and descending stairs. [1] [5] While the exact cause is unclear, it is believed to be due to overuse. [1] [2] Risk factors include trauma, increased training, and a weak quadriceps muscle. [1] It is particularly common among runners. [3]
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[1] Running long distance can cause pain to the knee joint, as it is a high-impact exercise. [2] The location and severity of knee pain may vary, depending on the cause of the problem. Signs and symptoms that sometimes accompany knee pain include: [1] Swelling and stiffness; Redness and warmth to the touch; Weakness or instability; Popping or ...
[1] [2] The patella is also often felt and seen out of place. [1] Complications may include a patella fracture or arthritis. [3] A patellar dislocation typically occurs when the knee is straight and the lower leg is bent outwards when twisting. [1] [2] Occasionally, it occurs when the knee is bent and the patella is struck directly. [1]
A patella fracture is a break of the kneecap. [1] Symptoms include pain, swelling, and bruising to the front of the knee. [1] A person may also be unable to walk. [1] Complications may include injury to the tibia, femur, or knee ligaments. [2] It typically results from a hard blow to the front of the knee or falling on the knee. [1]
DETROIT — Three years to the day since Dan Campbell stood behind a lectern talking about how his Detroit team would be “biting kneecaps,” Lions fans stood in the corner of Ford Field and ...