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Hybrid Zones

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Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.

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Related Experiment Video

Updated: Feb 12, 2026

Double Whole Mount in situ Hybridization of Early Chick Embryos

Double Whole Mount in situ Hybridization of Early Chick Embryos

Published on: October 27, 2008

Hybrid Constructs for Performing Three-level Hybrid Surgery: A Finite Element Study.

Yang Li¹, Jia Zhu², Zhenhua Liao³

¹State Key Laboratory of Tribology, Tsinghua University, Beijing, P. R. China; Department of Mechanical Engineering, Tsinghua University, Beijing, P. R. China.

World Neurosurgery

|April 9, 2018

Summary

The U-U-Cage hybrid construct significantly increases cervical spine motion and facet stress, especially at adjacent levels. Careful consideration of segmental motion is crucial during hybrid surgery planning to minimize compensatory effects.

Keywords:

Cervical biomechanics Dynamic cervical implant Finite element model Hybrid surgery

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Last Updated: Feb 12, 2026

Double Whole Mount in situ Hybridization of Early Chick Embryos

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Published on: October 27, 2008

Lumped-Parameter and Finite Element Modeling of Heart Failure with Preserved Ejection Fraction

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Author Spotlight: Development of a Novel Finite Element Analysis Model for Improved Orthognathic Surgical Techniques

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Published on: October 20, 2023

Area of Science:

Biomechanics
Spinal Surgery
Orthopedics

Background:

Hybrid constructs combining dynamic implants and fusion offer alternatives for cervical spine treatment.
Understanding the biomechanical implications of different hybrid construct configurations is essential for optimizing surgical outcomes.

Purpose of the Study:

To systematically investigate the biomechanical effects of three-level hybrid constructs on the C3-C7 cervical spine segments.
To analyze the impact of different implant placements (Cage-U-U, U-Cage-U, U-U-Cage) on cervical motion, facet stress, and required moments.

Main Methods:

Finite element analysis was used to simulate three distinct hybrid constructs in a validated C3-C7 cervical spine model.
Biomechanical parameters, including motion, stress, and moments, were evaluated during flexion and extension for each construct compared to an intact model.

Main Results:

All hybrid constructs increased motion at operated levels, with the U-U-Cage model showing a 52% maximum increase.
The U-U-Cage and U-Cage-U models led to over 40% increased flexion motion at adjacent levels.
Facet stress at adjacent levels increased significantly, particularly with the U-U-Cage model (39%).

Conclusions:

The U-U-Cage configuration results in greater compensatory motion and facet stress at adjacent levels.
Surgical planning for hybrid procedures must consider segmental motion to mitigate adjacent segment disease.
Placing anterior cervical discectomy and fusion at levels with minimal inherent motion may reduce compensatory demands on adjacent segments.