When assessing shoulder flexion, which description accurately reflects the patient position and goniometer alignment?

• A. Position: Supine or Hooklying; Stabilize: ribcage to feel for upward movement or thoracic extension; Fulcrum: lateral aspect of the greater tubercle; Stationary Arm: parallel to the midaxillary line of the thorax; Moving Arm: lateral midline of the humerus (lateral epicondyle or olecranon process)
• B. Position: Supine; Stabilize: ribcage to prevent thoracic flexion; Fulcrum: medial aspect of the greater tubercle; Stationary Arm: along the anterior axillary line; Moving Arm: anterior midline of the humerus
• C. Position: Sitting; Stabilize: thorax to prevent forward trunk movement; Fulcrum: medial epicondyle; Stationary Arm: along the sternum; Moving Arm: along the humerus
• D. Position: Prone; Stabilize: scapula to prevent movement; Fulcrum: acromion; Stationary Arm: along the clavicle; Moving Arm: along the humerus

Answer: (A)

When assessing shoulder flexion, the aim is to measure movement at the glenohumeral joint while minimizing contributions from the trunk and scapula. Positioning the patient supine or in hooklying helps keep the spine relaxed and makes it easier to control the trunk. Stabilizing the ribcage prevents thoracic flexion or excessive trunk movement as the arm lifts, so the recorded angle truly reflects shoulder motion.

Place the goniometer’s fulcrum at the lateral aspect of the greater tubercle of the humerus. Align the stationary arm parallel to the midaxillary line of the thorax, and align the moving arm along the lateral midline of the humerus toward the lateral epicondyle or olecranon. This setup tracks the humerus’ elevation relative to the body without bending or twisting the thorax, giving a consistent measure of shoulder flexion.

Other descriptions drift from this by changing the stabilization target (which can allow thoracic or scapular compensation), using an incorrect fulcrum (such as medial aspects or acromion without proper alignment), or aligning the arms along lines that don’t correspond to the humeral movement. Those deviations can distort the reading and mix in movement from other structures.