What deficit is associated with an injury to the latissimus dorsi?

What deficit is associated with an injury to the latissimus dorsi?

• A. Shoulder abduction and internal rotation
• B. Shoulder adduction and internal rotation
• C. Shoulder flexion and external rotation
• D. Shoulder extension and internal rotation

Answer: (B)

An injury to the latissimus dorsi muscle primarily affects shoulder adduction and internal rotation. The latissimus dorsi is a large, broad muscle located in the back, and it plays a crucial role in several movements of the shoulder joint. It allows the arm to be pulled downwards and towards the body, which is a key component of adduction. Additionally, it assists in internal rotation of the arm. When this muscle is injured, the ability to adduct the shoulder effectively becomes compromised. As a result, individuals may experience difficulty in movements that require them to bring their arm down towards the side of their body or rotate it inwards. This can impact various activities, including lifting, reaching, or any overhead movements where the latissimus dorsi's function is required. Understanding the actions of the latissimus dorsi helps clarify why shoulder adduction and internal rotation deficits are the primary consequence of an injury to this muscle.

An injury to the latissimus dorsi muscle primarily affects shoulder adduction and internal rotation. The latissimus dorsi is a large, broad muscle located in the back, and it plays a crucial role in several movements of the shoulder joint. It allows the arm to be pulled downwards and towards the body, which is a key component of adduction. Additionally, it assists in internal rotation of the arm.

When this muscle is injured, the ability to adduct the shoulder effectively becomes compromised. As a result, individuals may experience difficulty in movements that require them to bring their arm down towards the side of their body or rotate it inwards. This can impact various activities, including lifting, reaching, or any overhead movements where the latissimus dorsi's function is required.

Understanding the actions of the latissimus dorsi helps clarify why shoulder adduction and internal rotation deficits are the primary consequence of an injury to this muscle.