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6. Inability to Fully Extend

Swelling and pain may be the obvious indicators of knee problems, but the root of the problem is likely much deeper. Being unable to fully straighten the leg, along with significant knee pain and inflammation, can point to a serious knee injury. A tear of the anterior cruciate ligament (ACL) is one of the most common knee injuries. A meniscus tear, where a torn piece of the meniscus flips into the knee joint, will make it difficult to straighten the knee. Tendon injuries to the quadriceps muscle or the patella (the kneecap) will also affect one's ability to straighten the knee.

10 Symptoms of Knee Pain
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