The Elbow Lateral Pivot-Shift Test

Published October 23, 2026 Read time 2 min read Readers 56
Elbow Lateral Pivot-Shift Test

What is the Elbow Lateral Pivot-Shift Test?

The Elbow Lateral Pivot-Shift Test is a specialized orthopedic physical examination maneuver used to diagnose Posterolateral Rotatory Instability (PLRI) of the elbow. This condition typically results from an injury to the Lateral Ulnar Collateral Ligament (LUCL) complex, which compromises elbow stability and causes the radius and ulna to abnormally rotate away from the humerus.

How to Perform the Test

To properly execute the elbow lateral pivot-shift test, clinicians follow a precise sequence of movements:

  • Patient Position: The patient lies supine with the affected arm positioned overhead.
  • Initial Setup: The examiner holds the patient’s forearm in supination (palm facing upward).
  • Applying Stress: A gentle valgus stress (axial compression and a valgus moment) is applied while smoothly bringing the elbow from full extension into approximately 40 degrees of flexion.
  • Reduction Phase: As the elbow continues past 40 degrees into further flexion, triceps tension naturally reduces the radial head back into its normal anatomical position.
  • Clinical Tip: This test is frequently more reliable and easier to perform when the patient is under anesthesia, as muscle guarding in awake patients can mask the subluxation.

What is a Positive Test Result?

A positive elbow lateral pivot-shift test indicates posterolateral rotatory instability (PLRI) and presents in two distinct clinical phases:

  1. Apprehension and Subluxation (at ~40° Flexion): The patient experiences sudden apprehension, pain, or a feeling that the elbow is “giving out” as the radial head subluxates away from the capitellum.
  2. The Clunk / Reduction (with Further Flexion): As the examiner flexes the elbow beyond 40 degrees, a distinct clunk or audible/tactile snap occurs, accompanied by a sense of relief as the humeroradial joint successfully reduces.

Test Accuracy and Diagnostic Value

The diagnostic reliability of the lateral pivot-shift test varies significantly depending on whether the patient is awake:

  • Sensitivity in Anesthetized Patients: 100% (Highly reliable due to complete muscle relaxation).
  • Sensitivity in Awake Patients: 38% (Often limited by protective muscle guarding and patient apprehension).

References