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Effects of CO2 laser beam on cortical bone
G M Rayan1, J V Pitha, J S Edwards
1Orthopedic Department, University of Oklahoma Health Sciences Center, Oklahoma City.
Lasers in Surgery and Medicine
|January 1, 1991
Summary
Carbon dioxide (CO2) laser treatment on cortical bone showed minimal thermal damage, with changes not exceeding 200 microns. Focused beams and increased energy/exposure time led to greater matrix changes.
Area of Science:
- Biomedical Engineering
- Materials Science
- Laser Physics
Background:
- Cortical bone is a critical component in orthopedic applications.
- Understanding laser-tissue interactions is vital for developing new surgical techniques.
- Carbon dioxide (CO2) lasers offer precise energy delivery for tissue modification.
Purpose of the Study:
- To investigate the effects of CO2 laser irradiation on human cortical bone.
- To evaluate the impact of laser parameters (spot size, power, exposure time) on bone tissue.
- To determine the extent of thermal damage and histological changes in bone.
Main Methods:
- Human cortical bone samples (n=16) from amputated legs were utilized.
- Samples were divided into two groups: focused (1 mm spot) and defocused (3 mm spot) CO2 laser irradiation.
- Histological examination was performed to assess changes in bone matrix and cellular structures.
Main Results:
- Three distinct histological zones were observed: carbonization, fibrillation/enlarged lacunae, and normal bone.
- Superficial bony changes, including carbonization and matrix alteration, did not exceed 200 microns.
- Increased laser energy, focused beam application, and longer exposure times correlated with more significant matrix changes.
Conclusions:
- CO2 laser application on cortical bone in vitro results in superficial histological alterations.
- The extent of thermal damage is minimal and dependent on laser parameters.
- CO2 laser presents a viable tool for cortical bone modification with controlled thermal effects.