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QUAD AND PATELLAR TENDON
Patellar tendon and quadriceps serve a vital function in your body's anatomy. These complex components of the knee aid in jumping, cutting, & sudden rapid movements. This extension movement is compiled of the quadriceps muscle, quadriceps tendon, patella, patellar tendon, and tibia.
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Causes of a patellar tendon tear include:
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Forceful contraction while running, kicking, or jumping
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Falling directly on the kneecap
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Quadriceps Tendon tears: ​
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Sports Injury
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Joint weakness
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Underlying Chronic Knee Condition
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Bent knee under a heavy load
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Muscle strain
Patellar tendon tears and quadriceps tendon tears occur when the quadriceps tendon contracts suddenly, with force exceeding the capacity of the tendons. This may be as a result of jumping during sport or falling on a flexed knee. A rupture is commonly found in patients with pre-existing tendon degeneration/tendinosis.
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You may develop acute pain around the knee cap often associated with popping noise. The knee has significant swelling after ruptures. You may also experience difficulty extending the knee & walking after the injury.