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Related Experiment Video

Updated: May 9, 2026

Non-Invasive Compression-Induced Anterior Cruciate Ligament (ACL) Injury and In Vivo Imaging of Protease Activity in Mice
06:27

Non-Invasive Compression-Induced Anterior Cruciate Ligament (ACL) Injury and In Vivo Imaging of Protease Activity in Mice

Published on: September 29, 2023

T2 and T1ρ Mapping Reveals Time-Dependent Cartilage Response to In-Scanner Cyclic Compression After ACL

Hongtian Zhu1, Woowon Lee1, Timothy W Lowe1

  • 1Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO, USA.

Osteoarthritis and Cartilage
|May 7, 2026
PubMed
Summary
This summary is machine-generated.

Biomechanical loading alters knee cartilage in anterior cruciate ligament reconstruction patients, with T1ρ mapping showing potential for evaluating post-surgery changes. This MRI technique may detect early biochemical shifts before structural damage occurs.

Keywords:
ACLACL reconstructionArticular cartilageBiomechanics of articular cartilageCartilageKneeKnee jointMagnetic resonance imagingMechanical responseQMRI

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Last Updated: May 9, 2026

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A Non-Invasive Method for Generating the Cyclic Loading-Induced Intra-Articular Cartilage Lesion Model of the Rat Knee
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A Non-Invasive Method for Generating the Cyclic Loading-Induced Intra-Articular Cartilage Lesion Model of the Rat Knee

Published on: July 5, 2021

Area of Science:

  • Orthopedics and Sports Medicine
  • Biomedical Imaging
  • Biochemistry

Background:

  • Anterior cruciate ligament (ACL) injury significantly increases osteoarthritis risk.
  • Cartilage degeneration often persists post-ACL reconstruction.
  • Non-invasive imaging is needed to detect early biochemical cartilage changes.

Purpose of the Study:

  • Evaluate tibiofemoral cartilage response to controlled loading in healthy individuals.
  • Assess cartilage changes in patients 6 and 12 months post-ACL reconstruction.
  • Utilize quantitative magnetic resonance imaging (MRI) for sensitive detection.

Main Methods:

  • Quantitative relaxometry (T2 and T1ρ mapping) was employed.
  • A custom pneumatic device applied functional in-scanner knee loading (0.5Hz, 50% body weight).
  • Scans were performed pre- and post-loading in 12 healthy controls and 27 ACL reconstruction patients.

Main Results:

  • Biomechanical loading increased T2 values by 8% (6 months) and 7% (12 months) post-surgery.
  • No significant MR relaxometry differences were found between healthy and post-surgery cohorts with the current loading scheme.
  • ACL reconstruction patients showed increased relaxometry values post-loading at both time points.

Conclusions:

  • Functional biomechanical loading alters knee cartilage structure and relaxivity.
  • T1ρ mapping shows promise as a quantitative metric for evaluating post-ACL reconstruction knee cartilage.
  • Quantitative MRI can detect loading-induced biochemical changes in cartilage.