Elbow ROM Guide

Elbow Extension Range of Motion Measurement Guide

ElbowExtensionSagittal planeCustom in appUpdated 2026-09-27

Measurement Snapshot

MovementExtension
PlaneSagittal plane
Primary MusclesTriceps brachii, anconeus

There is no single value that establishes normality for every person or method. Record the setup and compare measurements in clinical context.

Elbow extension deficit is a common finding after trauma and immobilization. Track the deficit over time rather than reading a single value in isolation.

Standardized Setup

Patient Position
Seat or stand the patient with the arm at the side and the forearm supinated as the elbow moves toward full extension.
Stabilization
Stabilize the humerus so shoulder motion does not mask a true extension deficit.
Landmarks
Use the lateral epicondyle as the axis, the lateral humerus toward the acromion as the stationary reference, and the lateral forearm toward the radial styloid as the moving reference.

Step-by-Step Measurement

  1. Calibrate the flexed baseline and move the elbow toward extension.
  2. Read the angle at the available extension end range.
  3. Document any extension deficit as degrees short of zero, or note hyperextension.
  4. Record active and passive values separately when both are measured.

Common Measurement Errors

  • Recording hyperextension as a deficit or the reverse.
  • Allowing shoulder movement to disguise limited extension.
  • Changing forearm rotation between repeated measurements.

Custom Cobb Angle Pro Workflow

The app does not provide a named protocol for this movement. Use Custom as the body part, choose the movement, and apply your own clinical measurement method.

  1. In Range of Motion, choose Custom as the body part, then Extension as the movement. The app does not provide a named Elbow Extension protocol.
  2. Choose Photo, Camera, or Phone Sensor and use your own measurement setup. Custom measurements have generic in-app guidance rather than a reviewed movement-specific protocol.
  3. Record Elbow Extension, side, position, and method in the case label or notes so the saved Custom measurement can be interpreted later.

References

  1. Norkin CC, White DJ. Measurement of Joint Motion: A Guide to Goniometry. 5th ed. F.A. Davis Company; 2016.
  2. Morrey BF, Askew LJ, Chao EY. A biomechanical study of normal functional elbow motion. J Bone Joint Surg Am. 1981;63(6):872-877.

Frequently Asked Questions

How should elbow extension measurements be interpreted?

Record the measured value with the side, patient position, method, and active or passive status. Compare repeat measurements made the same way and interpret them with the full clinical context; one value alone cannot establish normality or a diagnosis.

What causes an elbow extension deficit?

Extension deficits commonly follow fracture, dislocation, and immobilization. Tracking the deficit over time shows whether mobility work is restoring the range.

Should elbow extension be measured actively or passively?

Measure and label both when possible. A gap between active and passive extension suggests a strength or motor-control limit rather than a purely mechanical block.