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Treatment of Ligament Constructs with Exercise-conditioned Serum: A Translational Tissue Engineering Model
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Pathological changes of human ligament after complete mechanical unloading.

Chia-Hsin Chen1, Xuhui Liu, Ming-Long Yeh

  • 1Department of Physical Medicine and Rehabilitation, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.

American Journal of Physical Medicine & Rehabilitation
|February 17, 2007
PubMed
Summary

Mechanical unloading causes significant detrimental changes in anterior cruciate ligament (ACL) remnants within 5-6 weeks. Early mechanical force in rehabilitation is crucial for injured ligament recovery.

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Area of Science:

  • Orthopedic research
  • Ligament pathology
  • Biomechanical analysis

Background:

  • Injured ligaments, particularly the anterior cruciate ligament (ACL), often undergo mechanical unloading during recovery.
  • Understanding the timeline of pathologic changes post-injury is critical for effective treatment strategies.

Purpose of the Study:

  • To document the sequential pathologic alterations in human anterior cruciate ligament (ACL) remnants after complete mechanical unloading.
  • To establish a time course for cellular and structural changes in injured ACLs.

Main Methods:

  • Pathologic examination of completely ruptured ACL remnants from 31 patients up to 14 weeks post-injury.
  • Comparison with normal ACLs from 5 cadaver donors.
  • Analysis of fibroblast density, crimp amplitude, and nuclear shape as key variables.

Main Results:

  • Significant increase in fibroblast density observed between 5-6 weeks of unloading.
  • Marked decrease in crimp amplitude and irregular fiber formation by 7-8 weeks.
  • Alterations in crimp wavelength and nuclear shape noted between 9-14 weeks.

Conclusions:

  • The anterior cruciate ligament (ACL) exhibits significant deleterious changes starting 5-6 weeks after mechanical unloading.
  • Findings support the early application of mechanical force in rehabilitation programs for patients with ligament injuries.