Final answer:
A patellar tendon rupture often occurs due to a sudden contraction of the quadriceps or from chronic overuse, with symptoms including severe knee pain and swelling. Treatment typically requires surgical intervention and physical therapy. Runner's knee differs as an overuse injury, treated with rest, ice, and physical therapy.
Step-by-step explanation:
Patellar Tendon Rupture
The patellar tendon rupture typically occurs due to a sudden contraction of the quadriceps muscle that is strong enough to overcome the strength of the patellar tendon, often during jumping or abrupt changes in direction. It can also happen due to degeneration of the tendon from chronic overuse or inflammation. The signs and symptoms (S&Sx) include a popping sensation at the time of injury, pain, swelling, and an inability to straighten the knee or perform a quadriceps contraction. The kneecap may also appear to move up into the thigh because it is no longer anchored to the tibia. The treatment (Tx) often involves surgical repair, especially in active individuals, followed by physical therapy for rehabilitation. Initial treatment may also include immobilization and avoidance of weight-bearing activities.
Runner's knee or patellofemoral syndrome is not the same as a patellar tendon rupture but is the most common overuse injury among runners, presenting as a dull, aching pain around the front of the knee. Treatment typically includes rest, ice, anti-inflammatory medications, and physical therapy focused on strengthening the quadriceps muscle to correct imbalances.
Injury prevention for any knee injury should include proper warm-up, strength training, and the wearing of appropriate footwear to ensure good alignment and minimize stress on the knee.