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Partial meniscectomy changes fluid pressurization in articular cartilage in human knees
M Kazemi1, L P Li, M D Buschmann
1Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada.
Journal of Biomechanical Engineering
|April 10, 2012
Summary
Partial meniscectomy significantly increases knee joint fluid pressure and stiffness. This study highlights the crucial role of fluid pressurization in understanding altered knee mechanics after meniscus surgery.
Area of Science:
- Biomechanics
- Biomedical Engineering
- Orthopedics
Background:
- Partial meniscectomy alters knee joint biomechanics by affecting cartilage and meniscus contact.
- Previous finite element studies often overlooked fluid pressurization in meniscectomy mechanics.
Purpose of the Study:
- To investigate fluid flow-dependent changes in articular cartilage after partial medial and lateral meniscectomies.
- To analyze the impact of meniscal resection size and location on knee joint mechanics.
Main Methods:
- Utilized a 3D fibril-reinforced poromechanical model of the knee joint.
- Simulated six partial longitudinal meniscectomies under various loading conditions (relaxation, creep).
Main Results:
- Partial meniscectomy substantially increased maximum fluid pressure and shifted its location in the femoral cartilage.
- Increased pressure and altered pressure dissipation rates correlated with meniscal resection size.
- Knee joint stiffness increased post-meniscectomy due to higher fluid pressure and slower dissipation.
Conclusions:
- Fluid pressurization plays a critical role in the altered mechanics of meniscectomized knees.
- Meniscectomy leads to increased joint stiffness and altered load distribution.
- The study emphasizes the importance of considering fluid dynamics in knee biomechanical analysis.
