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Related Experiment Video

Updated: Apr 24, 2026

Establishment and Evaluation of a Sheep Model of Full-thickness Osteochondral Defect

Establishment and Evaluation of a Sheep Model of Full-thickness Osteochondral Defect

Published on: April 14, 2026

Increase or decrease in stability after nucleotomy? Conflicting in vitro and in vivo results in the sheep model.

Sandra Reitmaier¹, David Volkheimer², Nikolaus Berger-Roscher²

¹Institute of Orthopedic Research and Biomechanics, Center of Musculoskeletal Research, University of Ulm, Ulm, Germany sandra.reitmaier@uni-ulm.de.

Journal of the Royal Society, Interface

|September 12, 2014

Summary

Nucleotomy surgery can increase spinal stability due to posterior structure adaptation, not just disc trauma. Minimizing damage to posterior spinal elements is crucial for post-operative stability.

Keywords:

animal study in vitro in vivo intervertebral disc nucleotomy stability

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Last Updated: Apr 24, 2026

Establishment and Evaluation of a Sheep Model of Full-thickness Osteochondral Defect

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Published on: April 14, 2026

Ovine Lumbar Intervertebral Disc Degeneration Model Utilizing a Lateral Retroperitoneal Drill Bit Injury

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Published on: May 25, 2017

Anterior Cervical Discectomy and Fusion in the Ovine Model

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Published on: October 5, 2009

Area of Science:

Spinal surgery
Biomechanics
Orthopedics

Background:

Nucleotomy is a common procedure for disc herniations.
Segmental instability post-nucleotomy may require re-operation or fusion.
Prior studies show conflicting results on post-nucleotomy stability.

Purpose of the Study:

To determine which spinal compartment influences stability after nucleotomy in vivo.
To investigate the role of anterior and posterior structures in post-operative spinal stability.

Main Methods:

Ovine motion segments were used to measure flexibility.
Stepwise reductions were applied to anterior and posterior spinal columns.
Nucleotomy was performed both in vivo and in vitro.

Main Results:

In vitro nucleotomy increased segment flexibility.
In vivo nucleotomy decreased segment flexibility after 12 weeks.
Removing posterior structures diminished flexibility differences.

Conclusions:

Post-operative spinal stability is influenced by adaptive mechanisms in posterior structures.
Minimizing damage to posterior spinal structures during surgery is vital.
Findings challenge the sole focus on disc trauma for post-operative stability.