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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.
The types of injuries most likely to cause cuff tears are those in which the elevated arm is forced downward (an eccentric force) or when the shoulder attempts a sudden jerky lift (a concentric force). Full thickness tears do not heal by themselves because the muscles pull the edges of the tear apart.otator cuff tears may involve the entire thickness of the tendon (full thickness rotator cuff tears) or they may be incomplete (partial thickness). Full thickness tears may involve only part of one tendon (usually the supraspinatus). They may extend to become massive involving multiple tendons as shown in the figure.