Comparison of histologic healing and biomechanical characteristics between repair techniques for a delaminated rotator cuff tear in rabbits

Background The purpose of this study was to compare histologic healing and biomechanical characteristics between 2 repair techniques (layer by layer, repair of each layer to bone separately; and whole layer, repair of each layer to the bone en masse) for delaminated rotator cuff tear. Materials and...

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Bibliographic Details
Published in:Journal of shoulder and elbow surgery 2017-05, Vol.26 (5), p.838-845
Main Authors: Cheon, Sang-Jin, MD, PhD, Kim, Jung-Han, MD, PhD, Gwak, Heui-Chul, MD, PhD, Kim, Chang-Wan, MD, PhD, Kim, Jeon-Kyo, MD, Park, Ji-Hwan, MD
Format: Article
Language:English
Subjects:
Animals
biomechanical
Biomechanical Phenomena
Cell Proliferation
Collagen - metabolism
Delamination
Fibrin - metabolism
Fibroblasts - pathology
histologic healing
layer-by-layer repair
Models, Animal
Neovascularization, Physiologic
Orthopedic Procedures - methods
Orthopedics
Rabbits
Rotator Cuff Injuries - pathology
Rotator Cuff Injuries - surgery
rotator cuff tear
Tensile Strength
whole-layer repair
Wound Healing
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Summary:Background The purpose of this study was to compare histologic healing and biomechanical characteristics between 2 repair techniques (layer by layer, repair of each layer to bone separately; and whole layer, repair of each layer to the bone en masse) for delaminated rotator cuff tear. Materials and methods Rabbits were used as subjects and classified into 2 groups: group A, right side, the layer-by-layer repair group; and group B, left side, the whole-layer repair group. Histologic evaluations were done at 3 weeks (n = 7) and 6 weeks (n = 4) after operation. Biomechanical tests to evaluate the tensile property were done at time 0 (n = 5) and 3 weeks (n = 5) after operation. Results Histologic healing improved in all groups. A smaller cleft was found between layers in group B compared with the cleft in group A at 3 weeks after operation. At time 0, group A showed a higher yield load and ultimate failure load (67 ± 10.5 N and 80 ± 7.8 N, respectively). However, at 3 weeks after operation, group B showed a higher yield load (48 ± 7.6 N). Conclusions In the delaminated rotator cuff tear model in the rabbit, the whole-layer repair showed a narrow gap between layers and a higher yield load at 3 weeks after operation. Surgical techniques that unite the cleft in a delaminated tear could improve biomechanical strength after operation.
ISSN:1058-2746
1532-6500
DOI:10.1016/j.jse.2016.10.005