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An image analysis method to quantify the lateral pivot shift test.

Yuichi Hoshino¹, Paulo Araujo, James J Irrgang

¹Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA, USA.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA

|December 29, 2011

Summary

This summary is machine-generated.

This study introduces a new, affordable method using video analysis to quantify the pivot shift test in knees with anterior cruciate ligament (ACL) deficiency. The technique successfully tracked femur translation during the test.

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Area of Science:

Orthopedic surgery
Biomechanics
Medical imaging analysis

Background:

The pivot shift test is crucial for diagnosing anterior cruciate ligament (ACL) injuries.
Current quantitative evaluation methods lack clinical availability and affordability.
A need exists for a simple, accessible tool for objective pivot shift assessment.

Purpose of the Study:

To develop and describe a novel image analysis technique for quantitative assessment of the pivot shift test.
To utilize universally available and affordable devices for this assessment.
To provide a clinically applicable method for evaluating the pivot shift test.

Main Methods:

Utilized a standard digital video camera to record knee motion during the pivot shift test in five ACL-deficient knees.
Attached skin markers to bony landmarks on the lateral knee (Gerdy's tubercle, fibular head, lateral epicondyle).
Processed video images using Image J software to create a 2-D coordinate system, calculating anteroposterior (AP) femur translation over time.

Main Results:

The reduction phase of the pivot shift was consistently tracked by a sudden anterior translation of the distal femur.
An average anterior translation of the lateral epicondyle was measured at 3.7 ± 2.1 mm.
This translation occurred rapidly, within 0.2 ± 0.1 seconds.

Conclusions:

The developed image analysis method successfully detected the sudden shift of the lateral knee compartment during the pivot shift test.
This technique offers a simple, affordable, and effective approach for the quantitative evaluation of the pivot shift test.
The method holds potential for improved clinical assessment of ACL injuries.