Electron microscopic examination of articular cartilage and subchondral bone after laser exposure in the experiment

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Abstract

Transmission and scanner electronic microscopy was used to study the influence of laser radiation upon the articular cartilage and subchondral bone. Laser radiation with maximum power (up to 70 W) was generated using surgical laser plant «Lamin-1» with 1.06 m wave length in air environment. Data obtained showed that zone of thermal lesion surrounding the defect ranged from 0.8 to 1.0 mm. Articular cartilage and subchondral bone outside the thermal lesion zone preserved specific ultrastructural architectonics. Those data gave evidence of a little traumatic effect of laser using «Lamin—1» and the possibilities of laser application for surgical interventions in traumatology and orthopaedics.

 

 

About the authors

L. N. Mikhailova

Central Institute of Traumatology and Orthopedics. N.N. Priorova

Author for correspondence.
Email: info@eco-vector.com
Russian Federation, Moscow

O. V. Hovhannisyan

Central Institute of Traumatology and Orthopedics. N.N. Priorova

Email: info@eco-vector.com
Russian Federation, Moscow

S. V. Ivannikov

Central Institute of Traumatology and Orthopedics. N.N. Priorova

Email: info@eco-vector.com
Russian Federation, Moscow

N. P. Omelianenko

Central Institute of Traumatology and Orthopedics. N.N. Priorova

Email: info@eco-vector.com
Russian Federation, Moscow

References

Supplementary files

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2. Rice. 1. Articular cartilage and subchondral bone tissue after exposure to laser radiation. SEM (magnitude 100).a — fibrous structures and charred tissue fragments in the formed defect. 7th day after exposure; b — articular cartilage and underlying subchondral bone tissue in areas adjacent to the border zone with the defect. 7th day after exposure; c — subchondral bone with dilated vascular and medullary canals. 21st day after exposure.

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3. Rice. 2. Ultrastructural changes in the articular cartilage on the 7th day after exposure to laser radiation. TEM. a — loosened surface of the articular cartilage in the zone bordering on the defect (magnitude 20000); b — coagulated organelles of chondrocytes in the zone bordering on the defect (magnitude 3000); c — collagen fibrils of the surface layer of the cartilaginous plate in the areas adjacent to the impact zone (magnitude 12000); d — chondrocytes of the surface layer located in areas adjacent to the border zone (magnitude 3000).

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4. Rice. 3. Cartilage cells and subchondral bone tissue on the 21st day after exposure to laser radiation. TEM. a — dystrophic changes in the cytoplasmic structures of the chondrocyte in the middle layers of the cartilaginous plate in the zone bordering the defect (magnitude 12000); b — chondrocytes of the surface layer of the cartilaginous plate near the border zone (magnitude 4400); c — subchondral bone tissue in areas adjacent to the border zone (magnitude 12000).

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