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Causes of a bicep tear. In some cases, the tendon will tear progressively and will begin with being frayed; in other cases the bicep will be torn acutely. The most common causes of bicep tears are overuse injuries and trauma; this includes accidents, falling and high speed impact. Trauma will usually result in an acute tear; the most common example of this is falling onto a hand that is stretched out on the ground.
Chondromalcia patella (patellofemoral pain syndrome) is a dull ache behind the kneecap (patella), usually caused by overuse or injury. You can feel and hear a painful crunching and grating when the knee is moved. Other knee injuries or types of arthritis can also cause crepitus.