Which phase of throwing exacerbates symptoms for valgus extension overload?

The deceleration phase of throwing is critical for understanding valgus extension overload, particularly because this phase involves a significant amount of eccentric loading on the shoulder and elbow. During the deceleration phase, the arm is moving rapidly after the ball has been released, leading to high levels of stress on the humeral joint and the ulnar collateral ligament.

Valgus extension overload occurs when there is excessive valgus strain on the elbow, combined with the need for extension, which is especially pronounced during the deceleration phase. As the shoulder and elbow experience deceleration forces, the valgus stress increases, causing pain and exacerbating any underlying conditions, such as ulnar collateral ligament insufficiency or degeneration.

This phase is crucial since it is where the momentum generated during the acceleration is rapidly decreased, subjecting the elbow to excessive tensile and compressive forces. If there is pre-existing weakness or instability, the likelihood of injury or symptom exacerbation significantly increases.

Understanding the dynamics of this phase helps in both diagnosing and managing conditions related to throwing athletes, emphasizing the need for rehabilitation that focuses on strengthening and stability in the elbow and shoulder during this critical moment in the throwing motion.