Shoulder Abduction & Adduction Assessment
Introduction
The Shoulder Abduction and Adduction Assessment evaluates the shoulder joint’s ability to move the arm away from and toward the body. These movements are fundamental for upper-body function, posture, and performance. This assessment helps identify limitations, asymmetries, or compensations that may affect strength, mobility, and injury risk.
Purpose and Functionality
Proper shoulder mobility and control are essential for stability and strength during daily and athletic activities. By assessing both abduction and adduction, this test helps identify muscular imbalances, restricted joint motion, or coordination deficits that could impact performance or contribute to overuse injuries. The assessment supports targeted training and rehabilitation strategies for optimal shoulder health.
What It Evaluates
Shoulder Abduction: Measures the arm’s ability to move away from the body, engaging the deltoid and supraspinatus muscles. This motion is crucial for overhead and lateral arm movements, and limited range can signal weakness or stiffness in the shoulder joint.
Shoulder Adduction: Evaluates the shoulder’s ability to draw the arm back toward the body, involving muscles like the pectoralis major, latissimus dorsi, and teres major. Restricted adduction can lead to poor shoulder stability and inefficient force transfer during pushing or pulling movements.
Shoulder Adduction Component
Shoulder adduction measures how well the arm moves toward the midline of the body. This motion is vital for maintaining shoulder joint integrity and strength during stabilizing and pulling actions. Limited adduction can indicate tightness in opposing muscle groups or weakness in the adductors, leading to imbalance and compensation.
Adduction is measured by the angular displacement of the arm toward the body’s midline using the shoulder joint as the axis. Angles greater than 50° score 100%, less than 20° score 0%, and intermediate values are scaled linearly.
Scoring:
Shoulder Abduction Component
Shoulder abduction measures how well the arm can move laterally away from the body. This movement is essential for overhead tasks and reflects the strength and coordination of the deltoid and rotator cuff muscles. Limited abduction may indicate joint stiffness or muscular imbalance affecting overhead function.
Abduction is measured by the angle between the arm and the torso as the arm lifts outward. Angles greater than 180° score 100%, less than 150° score 0%, and intermediate values are scaled linearly.
