Measurement Snapshot
ReferenceTraditional reference: 180 degrees
Common Adult RangeCommon adult active range: 150 to 170 degrees
Primary MusclesMiddle deltoid, supraspinatus, serratus anterior for upward scapular rotation
Shoulder abduction ROM is often tracked in rotator cuff, impingement, and adhesive capsulitis workflows. The value should be interpreted with pain behavior, strength testing, and clinician judgment.
Standardized Setup
- Patient Position
- Seat or stand the patient tall with the arm starting at the side and the palm gradually rotating upward as elevation passes shoulder height.
- Stabilization
- Prevent lateral trunk flexion, shrugging, and early scapular elevation that substitutes for glenohumeral movement.
- Landmarks
- Use the anterior acromion region as the axis, the sternum as the stationary reference, and the anterior humerus as the moving reference.
Step-by-Step Protocol
- Zero the measurement with the arm at the side.
- Ask the patient to lift the arm out to the side in the frontal plane.
- Watch for trunk side bend or shoulder shrugging and stop when compensation begins.
- Record the final angle with the testing position and active or passive label.
Common Measurement Errors
- Allowing the patient to side bend away from the measured arm.
- Failing to externally rotate the arm as it approaches overhead range.
- Capturing scapular elevation as if it were pure glenohumeral abduction.
Cobb Angle Pro Workflow
- Choose Shoulder Abduction and confirm frontal-plane orientation.
- Use live sensor mode for a strapped upper-arm measurement or overlay mode for clinician-held review.
- Save the value with pain notes, compensation notes, and side-by-side comparison when relevant.
References
- Magee DJ. Orthopedic Physical Assessment. 7th ed. Elsevier; 2020.
- Boone DC, Azen SP. Normal range of motion of joints in male subjects. J Bone Joint Surg Am. 1979;61(5):756-759.