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Related Experiment Video

Updated: Jun 8, 2026

New Variations for Strategy Set-shifting in the Rat

New Variations for Strategy Set-shifting in the Rat

Published on: January 23, 2017

A mechanized and standardized pivot shifter: technical description and first evaluation.

Musa Citak¹, Eduardo M Suero, Joshua C Rozell

¹Department of Orthopaedic Surgery, Hospital for Special Surgery, NY, USA.

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

|October 19, 2010

Summary

A new mechanized pivot shifter (MPS) offers reliable knee instability assessment. This device provides consistent tibiofemoral translation measurements, improving upon subjective manual pivot shift tests (PST) for clinical use.

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Area of Science:

Orthopedic Surgery
Biomechanics
Medical Device Development

Background:

The pivot shift test (PST) is crucial for evaluating knee rotatory instability.
Current manual PST methods suffer from subjectivity and lack of motion quantification.
This limits diagnostic accuracy and consistency in clinical practice.

Purpose of the Study:

To develop and validate a mechanized device for objective, quantitative assessment of the pivot shift test.
To overcome the limitations of subjective grading in manual PST.
To improve the reliability of knee instability assessment.

Main Methods:

A mechanized pivot shifter (MPS) was constructed.
Tibiofemoral motion was quantified using a surgical navigation system on cadaveric specimens with resected anterior cruciate ligaments.
Measurements were compared between the MPS and two experienced examiners performing the manual PST.

Main Results:

The MPS demonstrated comparable lateral compartment translation magnitudes to manual techniques.
The MPS exhibited narrower limits of agreement, indicating superior test-retest reliability.
No significant differences were found in translation magnitudes between the mechanized and manual methods.

Conclusions:

The mechanized pivot shifter (MPS) provides objective and reliable quantitative assessment of the pivot shift test.
The MPS offers improved consistency and repeatability compared to manual examination.
This device presents a significant clinical advantage for diagnosing knee rotatory instability.