What is the most common cause of rupture of the supraspinatus tendon?

The most common cause of rupture of the supraspinatus tendon is often associated with age-related degeneration and the cumulative effects of repetitive stress on the shoulder. While heavy lifting in a jerky motion can contribute to acute injuries, the more prevalent factor leading to supraspinatus tendon rupture is chronic wear and tear, particularly from repetitive overhead activities.

Over time, the tendon can experience microtrauma and degeneration due to continuous use, especially in individuals who engage in activities that require overhead motions, such as athletes or those in physically demanding jobs. The degenerative changes that occur with aging, including loss of tendon elasticity and changes in blood supply, further increase susceptibility to injury.

In assessing this context, while the other options may represent potential causes of tendon issues, they are not as directly linked to the typical, progressive condition leading to supraspinatus tendon rupture. Thus, recognizing the role of age-related changes and repetitive overhead stress is crucial in understanding the most common underlying cause of this injury.