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Histologic changes in ruptured canine cranial cruciate ligament
Kei Hayashi1, Joseph D Frank, Caron Dubinsky
1Comparative Orthopaedic Research Laboratory, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706, USA.
Veterinary Surgery : VS
|June 5, 2003
Summary
Ruptured canine cranial cruciate ligaments (CCL) show significant cell loss and extracellular matrix (ECM) disruption. Early treatment is crucial to reverse progressive changes and prevent CCL structural failure.
Area of Science:
- Veterinary Orthopedics
- Ligament Biology
- Extracellular Matrix Research
Background:
- Canine cranial cruciate ligament (CCL) rupture is a common injury in dogs.
- Understanding the cellular and matrix changes in ruptured CCL is vital for developing effective treatments.
Purpose of the Study:
- To investigate cellular and extracellular matrix (ECM) structural alterations in ruptured canine CCL.
- To compare these changes with intact CCL in healthy dogs.
Main Methods:
- Prospective study analyzing CCL specimens from dogs with ruptured and intact CCL.
- Assessed fibroblast density and phenotype in core and epiligamentous regions.
- Examined ECM collagen birefringence and crimp structure in the core region.
Main Results:
- Ruptured CCL showed significant fibroblast loss in the core region but similar cell density in the epiligamentous region compared to intact CCL.
- Increased numbers of spheroid cells with chondroid transformation were observed in the core of ruptured CCL.
- Extensive disruption of collagen structure, decreased birefringence, and elongated crimp were evident in the ECM of ruptured CCL.
Conclusions:
- Ruptured CCL exhibits profound cellular and collagenous ECM structural changes.
- A localized repair response occurs in the epiligamentous region, but bridging scar formation is absent.
- These degenerative changes likely result from chronic mechanical stress and microinjury, necessitating interventions to halt progression and prevent CCL failure.