During arm elevation, which accessory motion at the sterno-clavicular joint occurs?

During arm elevation, which accessory motion at the sterno-clavicular joint occurs?

• A. Anterior glide of the clavicle
• B. Superior glide of the clavicle
• C. Inferior glide of the clavicle
• D. Medial glide of the clavicle

Answer: (C)

During arm elevation, the accessory motion that occurs at the sterno-clavicular joint is a superior glide of the clavicle. This motion is critical to allow for a full range of motion at the shoulder girdle and to facilitate proper functioning of the scapula and humerus during elevation and abduction of the arm. As the arms are raised, the shoulder girdle must reposition to accommodate the upward movement. This repositioning involves the clavicle moving superiorly, allowing the acromion of the scapula to follow and maintain joint congruence at the glenohumeral joint. The superior glide helps to elevate the shoulder, ensuring proper alignment and reducing the risk of impingement or other shoulder dysfunctions. Understanding the dynamics of the sterno-clavicular joint during arm elevation is essential in orthopedic practice as it informs rehabilitation approaches and strategies for preventing or addressing shoulder injuries.

During arm elevation, the accessory motion that occurs at the sterno-clavicular joint is a superior glide of the clavicle. This motion is critical to allow for a full range of motion at the shoulder girdle and to facilitate proper functioning of the scapula and humerus during elevation and abduction of the arm.

As the arms are raised, the shoulder girdle must reposition to accommodate the upward movement. This repositioning involves the clavicle moving superiorly, allowing the acromion of the scapula to follow and maintain joint congruence at the glenohumeral joint. The superior glide helps to elevate the shoulder, ensuring proper alignment and reducing the risk of impingement or other shoulder dysfunctions.

Understanding the dynamics of the sterno-clavicular joint during arm elevation is essential in orthopedic practice as it informs rehabilitation approaches and strategies for preventing or addressing shoulder injuries.