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In vitro analysis of laser meniscectomy
C T Vangsness1, Y Akl, S J Nelson
1Department of Orthopaedic Surgery, University of Southern California, Los Angeles 90033, USA.
Clinical Orthopaedics and Related Research
|January 1, 1995
Summary
Scalpel and mechanical meniscectomies caused minimal cellular changes. Among lasers, the excimer laser showed the least tissue alteration, with CO2 lasers performing well in air.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Surgical Technology
Background:
- Partial meniscectomy is a common orthopedic procedure.
- Various surgical tools, including lasers, are used for meniscectomy.
- Understanding the tissue effects of different meniscectomy methods is crucial for patient outcomes.
Purpose of the Study:
- To compare the histological and morphological effects of different meniscectomy techniques.
- To evaluate the performance of various laser systems against traditional methods.
- To assess the impact of saline environment on meniscectomy outcomes.
Main Methods:
- Partial meniscectomies were performed on 32 human meniscal autopsy specimens.
- Tested techniques included scalpel, mechanical, electrocautery, and five laser systems (CO2, Nd:YAG, KTP, Ho:YAG, excimer).
- Histological analysis (H&E, Sirius Red) and scanning electron microscopy (SEM) evaluated thermal changes and surface morphology.
Main Results:
- Scalpel and mechanical methods exhibited the least cellular changes (10-15 nm).
- Excimer laser showed the least tissue alteration among lasers; pulsed CO2 was better than Ho:YAG, Nd:YAG, and KTP.
- Scalpel yielded the smoothest edge, followed by excimer, CO2, Ho:YAG, Nd:YAG, and KTP lasers; electrocautery caused the most disruption.
Conclusions:
- Scalpel and mechanical meniscectomies offer minimal thermal damage.
- Excimer and CO2 lasers present viable alternatives with less tissue alteration compared to other lasers.
- Surgical environment (air vs. saline) impacts laser performance and thermal effects.