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Related Experiment Video

Updated: Jul 22, 2025

A Standardized Method for Measurement of Elbow Kinesthesia

A Standardized Method for Measurement of Elbow Kinesthesia

Published on: October 10, 2020

A Simple and Versatile Test for Elbow Posterolateral Rotatory Instability.

Amanda N Goldin¹, Kathryn D Dwight¹, Eric R Hentzen¹

¹University of California San Diego, La Jolla, USA.

Hand (New York, N.Y.)

|July 25, 2023

Summary

This summary is machine-generated.

The new Posterior Radiocapitellar Subluxation Test (PRST) shows improved accuracy and sensitivity for diagnosing posterolateral rotatory instability (PLRI) compared to the traditional lateral pivot shift test. This maneuver offers a potentially easier and more effective diagnostic option for LCL deficiency.

Keywords:

anatomy basic science diagnosis elbow fracture/dislocation ligament soft tissue reconstruction specialty surgery trauma

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Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

Published on: September 18, 2020

Area of Science:

Orthopedic Surgery
Biomechanics
Diagnostic Techniques

Background:

Posterolateral rotatory instability (PLRI) is caused by lateral ulnar collateral ligament (LCL) deficiency.
The lateral pivot shift test is the standard diagnostic tool for PLRI but is often difficult to perform and poorly tolerated by patients.
A novel maneuver, the Posterior Radiocapitellar Subluxation Test (PRST), has been developed to potentially overcome these limitations.

Purpose of the Study:

To compare the diagnostic efficacy and reproducibility of the PRST against the established lateral pivot shift test for PLRI.
To evaluate the sensitivity, specificity, and accuracy of both diagnostic tests in cadaveric specimens.

Main Methods:

Ten cadaveric upper extremity specimens were utilized.
The LCL origin was released in five specimens to induce PLRI.
Orthopedic surgeons and a resident blindly performed both the PRST and the lateral pivot shift test, with assessments repeated the following day.

Main Results:

The PRST demonstrated higher overall accuracy (77.5%) compared to the pivot shift test (67.5%, P = .03).
Sensitivity for the PRST was significantly greater (75.0%) than for the pivot shift test (50.0%, P = .003).
Specificity was comparable between the PRST (80.0%) and the pivot shift test (85.0%, P = .55).

Conclusions:

The Posterior Radiocapitellar Subluxation Test (PRST) is a promising new diagnostic maneuver for PLRI.
PRST exhibits comparable or superior accuracy and sensitivity to the lateral pivot shift test.
The PRST offers comparable intraobserver and interobserver reliability, suggesting it is a reproducible diagnostic tool.