ACE Personal Trainer Practice Exam

What characterizes the scapulothoracic joint?

1. Provides extensive mobility

2. Needs to be stable

3. Acts as a hinge joint

4. Allows for high load-bearing

The correct answer is: Needs to be stable

The scapulothoracic joint is primarily characterized by its extensive mobility, which allows for a wide range of motion for the shoulder complex. This joint is not a traditional synovial joint; instead, it is formed by the articulation of the scapula with the thoracic ribcage. The primary function of the scapulothoracic joint is to facilitate movements such as elevation, depression, protraction, and retraction of the scapula, crucial for optimal shoulder function. Emphasizing stability is important because the shoulder complex, which includes the scapulothoracic joint, depends on a balance between mobility and stability. While stability is crucial for the integrity of the shoulder complex, the primary characteristic of this specific joint is its mobile nature, allowing different shoulder motions necessary for various activities. In conclusion, the correct understanding of the scapulothoracic joint involves recognizing its main role in providing extensive mobility rather than emphasizing stability or characteristics typical of a hinge joint or high load-bearing capabilities.