What primarily causes rotator cuff deterioration in athletes?

The primary factor responsible for rotator cuff deterioration in athletes is often overuse of the biceps tendon and the rotator cuff itself. Athletes, particularly those involved in overhead sports such as swimming, tennis, and baseball, frequently engage in repetitive motions that place strain on these structures. This repetitive stress can lead to microtears in the rotator cuff muscles and tendons, inflammation, and ultimately deterioration over time.

Furthermore, when the biceps tendon, which has a degree of commonality and connection with the rotator cuff, is overused, it can exacerbate the stress placed on the rotator cuff. This interdependence means that damage to one area can often lead to compromise in the other, intensifying the risk of rotator cuff injuries in athletes who do not adequately manage rest and recovery from repetitive activities.

In contrast, increased flexibility in the shoulder can be beneficial and is often not linked to deterioration. Static muscle contractions, while they may contribute to muscle fatigue, do not have the same direct correlation with rotator cuff injury as overuse does. Additionally, poor nutritional intake can affect overall muscle and tendon health but is not a primary cause of rotator cuff deterioration in the same way that repetitive strain and overuse are.