Shoulder Flexion and Extension Assessment
Introduction
The Shoulder Flexion and Extension Assessment evaluates the shoulder joint’s range of motion and functional control during forward (flexion) and backward (extension) movements. These movements are critical for many daily and athletic activities that require overhead reaching, lifting, and posture stability.
Purpose and Functionality
Proper shoulder mobility and control are essential for efficient upper-body mechanics, injury prevention, and performance. This assessment identifies limitations, asymmetries, or weaknesses in shoulder movement that may affect functional performance or contribute to compensatory motion patterns.
What It Evaluates
Shoulder Flexion: Measures how well the arm can be raised forward and upward from a neutral position. Limited flexion may indicate joint restrictions, muscle tightness, or weakness in the anterior shoulder and deltoid muscles.
Shoulder Extension: Evaluates how well the arm can move backward from a neutral position. This reflects posterior shoulder flexibility and strength, and can highlight tightness in the chest or restrictions in the shoulder joint capsule.
Shoulder Flexion Component
Shoulder flexion measures the ability to lift the arm forward and upward from a neutral position. This movement is critical for actions like reaching overhead, throwing, or lifting objects. Restricted flexion may indicate tightness in the shoulder joint or capsule, weakness in shoulder flexors, or compensatory trunk extension.
Flexion is measured as the angle between the upper arm and torso when lifting the arm forward. Angles greater than 180° score 100%, less than 150° score 0%, and values in between are scaled linearly.
Scoring:
Shoulder Extension Component
Shoulder extension evaluates the ability to move the arm backward from a neutral position. This motion is vital for maintaining posture, reaching behind the body, and performing movements like swimming or rowing. Limitations in extension may indicate tight chest muscles, restricted joint capsule mobility, or posterior shoulder weakness.
Extension is measured as the angle between the upper arm and torso when moving the arm backward. Angles greater than 60° score 100%, less than 40° score 0%, and intermediate values are scaled linearly.
