The Shoulder External Rotation 90° Test measures external rotation with the shoulder abducted to 90 degrees and the elbow flexed to 90 degrees. It is especially useful for overhead athletes, throwing-related assessments and side-to-side shoulder rotation tracking.
A throwing athlete may have different external rotation at 90 degrees compared with the non-throwing side. A gym client may feel restricted in an overhead or externally rotated shoulder position. This test helps quantify external rotation in a position that is different from arm-by-side testing.
The MAT article describes the client seated or standing, abducting the shoulder to 90 degrees, flexing the elbow to 90 degrees and externally rotating the forearm upward while keeping shoulder and elbow position unchanged. The MAT source lists at least 90 degrees of ER from this position as the practical target.
Test name: Shoulder External Rotation 90° Test
Purpose: Assess external rotation ROM at 90 degrees of shoulder abduction
What it assesses: Shoulder ER in an abducted position
Equipment: Measurz inclinometer
Key finding: ER angle in degrees
Best used with: Shoulder internal rotation 90°, shoulder ER/IR at 0°, throwing assessment, overhead mobility and shoulder strength testing
Key limitation: Shoulder/elbow position drift can change the score
This test measures external rotation ROM with the shoulder abducted and elbow flexed to 90 degrees.
It is used to assess rotation in an overhead-like position, compare sides and track changes across sessions.
It measures shoulder external rotation ROM at 90 degrees of abduction. It does not measure rotator cuff strength, shoulder stability or throwing readiness by itself.
Active ROM is measured when the client rotates the forearm upward. Passive ROM may be measured if assisted. Record the method clearly.
Throwers, swimmers, overhead athletes, gym clients, racquet sport athletes and clients where shoulder rotation at 90 degrees is relevant.
Measurz inclinometer, treatment space, Measurz app and notes for side, shoulder position, elbow position, pain and active/passive method.
Position the client seated or standing. Abduct the shoulder to 90 degrees and flex the elbow to 90 degrees. Align the Measurz inclinometer with the midpoint of the forearm. Ask the client to externally rotate the forearm upward as far as possible while keeping the shoulder and elbow in position. Save the result.
Record ER ROM in degrees. The MAT source lists at least 90 degrees as the practical target from this 90-degree starting position.
Interpret with internal rotation at 90 degrees, total arc, symptoms, sport demands and side comparison.
Evidence level: Level 2, related or closest available reference values.
Use 90 degrees as a practical MAT reference. In throwing athletes, side-to-side differences may reflect sport adaptation and should be interpreted with total rotation arc and symptoms.
Shoulder rotation ROM can be measured reliably with digital inclinometers when procedures are standardised. Measurement error still matters, particularly when using small side-to-side changes for decision-making.
Common errors include shoulder dropping below 90 degrees, elbow drift, trunk extension, scapular compensation, wrist movement and comparing ER at 90° directly with ER at 0°.
Use this test to monitor overhead rotational ROM, compare sides and add context to throwing, swimming, pressing and shoulder strength tests.
Record side, ER angle, shoulder abduction angle, elbow position, active/passive method, pain score, symptom location, compensation, comparison side and related IR at 90° findings.
Shoulder Internal Rotation 90° Test
Shoulder External Rotation 0° Test
Shoulder Internal Rotation 0° Test
Med Ball Throw
CKCUEST
Shoulder Strength Testing
It measures external rotation ROM with the shoulder abducted to 90 degrees.
The MAT source lists at least 90 degrees.
It can be useful context, especially when combined with internal rotation and total arc.
No. They are different positions and should be recorded separately.
The test measures ER at 90 degrees abduction.
Shoulder and elbow position must be maintained.
Record active/passive method.
Use with IR at 90 degrees.
Track total rotation context in Measurz when useful.
Cools, A. M., et al. (2021). Inclinometer reliability for shoulder ranges of motion in individuals with subacromial impingement syndrome. Journal of Manipulative and Physiological Therapeutics, 44(3), 236–244.
Shimizu, H., et al. (2022). Validity and reliability of a smartphone application for self-measurement of active shoulder range of motion in a standing position among healthy adults. JSES International, 6(4), 675–682.
Kiatkulanusorn, S., et al. (2023). Analysis of the concurrent validity and reliability of five common clinical goniometric devices. Scientific Reports, 13, 20915.
