Zhongguo gu shang = China journal of orthopaedics and traumatology · 2026
[Finite element analysis of mechanical of acupotomy release on popliteus muscle for knee osteoarthritis].
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Wu Hemin, Jin Chaodie, Sun Zixuan, Jiang Haoran, Wu Yungang, Zhang Jiaxin
Аннотация
OBJECTIVE: To evaluate impact of needle-knife dissection of popliteus muscle on stress distribution of knee joint by establishing finite element models of knee joint before and after needle-knife intervention.
METHODS: CT data from a patient (male, 42 years old, weighted 82 kg, the course of disease ranged from 15 months, left side, K-L gradeⅡ)with early-stage knee osteoarthritis (KOA) were used to construct a finite element model of knee joint by using Mimics 21.0, Geomagic 2021, SolidWorks 2021, and Ansys 2021R1. The distal tibia was fixed with complete constraints to simulate single-leg standing. A vertical downward force of 500 N was applied to the proximal femur, and 200 N upward force parallel to Q-angle was applied to quadriceps tendon. The knee joint was simulated at 30° and 90° flexion angles to compare stress distribution and magnitude changes in meniscus, femoral cartilage, and patellar cartilage before and after acupotomy intervention.
RESULTS: At 30° of knee flexion, the peak surface stresses of femoral cartilage, patellar cartilage, and meniscus in intervention group decreased by 5.910 MPa (31.23%), 0.441 MPa (2.05%), and 6.216 MPa(26.38%), respectively, compared with non-intervention group. At 90° of knee flexion, the corresponding decreases were 1.999 MPa (7.10%), 2.736 MPa (6.49%), and 4.671 MPa (10.51%), respectively. After acupotomy release, the area of stress distribution increased, and abnormal stress concentration was alleviated.
CONCLUSION: Acupotomy release of popliteus muscle effectively improves stress distribution on tibiofemoral and patellofemoral joint surfaces, reduces peak stress on articular surfaces, and promotes more uniform stress distribution, thereby providing a therapeutic approach for early-stage knee osteoarthritis.
METHODS: CT data from a patient (male, 42 years old, weighted 82 kg, the course of disease ranged from 15 months, left side, K-L gradeⅡ)with early-stage knee osteoarthritis (KOA) were used to construct a finite element model of knee joint by using Mimics 21.0, Geomagic 2021, SolidWorks 2021, and Ansys 2021R1. The distal tibia was fixed with complete constraints to simulate single-leg standing. A vertical downward force of 500 N was applied to the proximal femur, and 200 N upward force parallel to Q-angle was applied to quadriceps tendon. The knee joint was simulated at 30° and 90° flexion angles to compare stress distribution and magnitude changes in meniscus, femoral cartilage, and patellar cartilage before and after acupotomy intervention.
RESULTS: At 30° of knee flexion, the peak surface stresses of femoral cartilage, patellar cartilage, and meniscus in intervention group decreased by 5.910 MPa (31.23%), 0.441 MPa (2.05%), and 6.216 MPa(26.38%), respectively, compared with non-intervention group. At 90° of knee flexion, the corresponding decreases were 1.999 MPa (7.10%), 2.736 MPa (6.49%), and 4.671 MPa (10.51%), respectively. After acupotomy release, the area of stress distribution increased, and abnormal stress concentration was alleviated.
CONCLUSION: Acupotomy release of popliteus muscle effectively improves stress distribution on tibiofemoral and patellofemoral joint surfaces, reduces peak stress on articular surfaces, and promotes more uniform stress distribution, thereby providing a therapeutic approach for early-stage knee osteoarthritis.