scholarly journals Biomechanical Study on the Stress Distribution of the Knee Joint After Tibial Fracture Malunion with Residual Varus–Valgus Deformity

2020 ◽  
Vol 12 (3) ◽  
pp. 983-989
Author(s):  
Ming Li ◽  
Hengrui Chang ◽  
Ning Wei ◽  
Wenli Chang ◽  
Ying Yan ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Knee Joint ◽  
Tibial Fracture ◽  
Valgus Deformity ◽  
Biomechanical Study

scholarly journals Biomechanical study on the stress distribution of the knee joint after distal femoral fracture malunion with residual varus-valgus deformity 

2020 ◽  
Author(s):  
Ming Li ◽  
Pan Hu ◽  
Lijie Ma ◽  
Di Zhang ◽  
Wenli Chang ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Knee Joint ◽  
Femoral Fracture ◽  
Femoral Fractures ◽  
Valgus Deformity ◽  
Biomechanical Study ◽  
Lower Limbs ◽  
Neutral Position ◽  
Distal Femoral Fracture ◽  
Lateral Plateau

Abstract Background: To investigate the effect of residual varus and valgus deformity on the stress distribution of knee joint after distal femoral fracture malunion. Methods: Fourteen adult cadaver specimens with formalin were selected to establish the femoral fractures models, which were fixed subsequently at neutral position (anatomical reduction) and malunion positions (at 3 degrees, 7 degrees, 10 degrees valgus positions and 3 degrees, 7 degrees, and 10 degrees varus positions). The stress distribution on the medial and lateral plateau of the tibia was quantitatively measured using ultra-low pressure sensitive film technology. The change of stress distribution of knee joint after femoral fracture malunion and the relationship between stress value and residual varus varus or valgus deformity were analyzed.Results: Under 400 N vertical load, the stress values on the medial and lateral plateau of the tibia at the neutral position were 1.162±0.114 MPa and 1.103±0.144 MPa, respectively. When compared with the stress values measured at the neutral position, the stress on the medial plateau of tibia were significantly higher at varus deformities and lower at valgus deformities, and the stress on the lateral plateau was significantly higher at valgus deformity and lower at varus deformities (all P<0.05). The stress values on the medial plateau of tibia were significantly higher than the corresponding data on the lateral plateau at neutral and 3 degrees, 7 degrees, 10 degrees varus deformities, respectively (all P<0.05), and significantly lower than the corresponding data on the lateral plateau at 3 degrees, 7 degrees, 10 degrees valgus deformities, respectively (all P<0.05). Conclusions: Residual varus and valgus deformity after femoral fracture malunion can cause obvious changes of the stress distribution of knee joint. Therefore, the distal femoral fracture should be anatomically reduced and rigidly fixed to avoid residual varus-valgus deformity and malalignment of lower limbs.

scholarly journals Biomechanical study on the stress distribution of the knee joint after distal femoral fracture malunion with residual varus-valgus deformity

2020 ◽  
Author(s):  
Ming Li ◽  
Pan Hu ◽  
Lijie Ma ◽  
Di Zhang ◽  
Wenli Chang ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Knee Joint ◽  
Femoral Fracture ◽  
Femoral Fractures ◽  
Valgus Deformity ◽  
Biomechanical Study ◽  
Lower Limbs ◽  
Neutral Position ◽  
Distal Femoral Fracture ◽  
Lateral Plateau

Abstract Background To investigate the effect of residual varus and valgus deformity on the stress distribution of knee joint after distal femoral fracture malunion. Methods Fourteen adult cadaver specimens with formalin were selected to establish the femoral fractures models, which were fixed subsequently at neutral position (anatomical reduction) and malunion positions (at 3 degrees, 7 degrees, 10 degrees valgus positions and 3 degrees, 7 degrees, and 10 degrees varus positions). The stress distribution on the medial and lateral plateau of the femur was quantitatively measured using ultra-low pressure sensitive film technology. The change of stress distribution of knee joint after femoral fracture malunion and the relationship between stress value and residual varus varus or valgus deformity were analyzed. Results Under 400 N vertical load, the stress values on the medial and lateral plateau of the femur at the neutral position were 1.162 ± 0.114 MPa and 1.103 ± 0.144 MPa, respectively. When compared with the stress values measured at the neutral position, the stress on the medial plateau of femur were significantly higher at varus deformities and lower at valgus deformities, and the stress on the lateral plateau was significantly higher at valgus deformity and lower at varus deformities (all P < 0.05). The stress values on the medial plateau of tibia were significantly higher than the corresponding data on the lateral plateau at neutral and 3 degrees, 7 degrees, 10 degrees varus deformities, respectively (all P < 0.05), and significantly lower than the corresponding data on the lateral plateau at 3 degrees, 7 degrees, 10 degrees valgus deformities, respectively (all P < 0.05). Conclusions Residual varus and valgus deformity after femoral fracture malunion can cause obvious changes of the stress distribution of knee joint. Therefore, the distal femoral fracture should be anatomically reduced and rigidly fixed to avoid residual varus-valgus deformity and malalignment of lower limbs.

scholarly journals Biomechanical Study on the Stress Distribution of the Knee Joint After Distal Femoral Fracture Malunion With Residual Varus-valgus Deformity

2021 ◽  
Author(s):  
Ming Li ◽  
Pan Hu ◽  
Lijie Ma ◽  
Hao Du ◽  
Yanbin Zhu ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Knee Joint ◽  
Femoral Fracture ◽  
Femoral Fractures ◽  
Valgus Deformity ◽  
Biomechanical Study ◽  
Neutral Position ◽  
Distal Femoral Fracture ◽  
Pressure Sensitive Film ◽  
Lateral Plateau

Abstract BackgroundThis study aims to examine the biomechanical influence of residual varus and valgus deformity after malunion of distal femoral fractures on the knee joint. MethodsWe selected 14 adult cadaver specimens to establish the femoral fractures models and subsequently fixed them at neutral position and malunion positions, i.e. at 3°, 7° and 10° at valgus and varus positions, respectively. Ultra-low pressure sensitive film technology was used to quantitatively measure the stress distribution on the medial and lateral plateau of the tibia.ResultsAt neutral position, with 400 N vertical load applied, the stress values of the medial and lateral plateau of tibia were 1.162±0.114 MPa and 1.103±0.144 MPa, respectively. Compared with those measured at neutral position, the stress on the medial plateau of the valgus tibia significantly increased, while that on the lateral plateau of the valgus tibia significantly decreased (both P<0.05). In contrast, the stress on the lateral plateau of the valgus tibia significantly increased, while that on the medial plateau of the valgus tibia significantly decreased (both P<0.05). The medial plateau of tibia demonstrated significantly higher stress values than those on the lateral plateau at neutral position and 3°, 7°, 10° varus deformities, respectively (all P<0.05), but showed significantly lower values than the those on the lateral plateau at 3°, 7°, 10° valgus deformities, respectively (all P<0.05). ConclusionsThe residual varus and valgus deformities after mulunion of the distal femoral fracture resulted in significant changes of the stress distribution of the knee joint. Anatomical reduction and firm fixation of distal femoral fracture should be as possible to be obtained to avoid possible varus and valgus deformities.

scholarly journals Biomechanical study on the stress distribution of the knee joint after residual rotation deformity of tibial fracture

2020 ◽  
Author(s):  
Ming Li ◽  
Yanbin Zhu ◽  
Ning Wei ◽  
Wenli Chang ◽  
Zeyue Jin ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Knee Joint ◽  
Lower Limb ◽  
External Rotation ◽  
Biomechanical Study ◽  
Lower Limbs ◽  
Neutral Position ◽  
Lateral Stress ◽  
Significant Difference ◽  
The Difference

Abstract Objectives To investigate the effect of residual rotation deformity on the stress distribution of the knee joint after surgery to treat middle and upper tibial fractures. Methods Fourteen adult cadaver specimens that were preserved with formalin were included, and the tibias were randomly positioned at 0 degree, 5 degrees, 10 degrees, and 15 degrees from the line of force of the lower limb. These positions modeled deformities of 5 degrees, 10 degrees, and 15 degrees from the line of force. Low-pressure pressure-sensitive film technology measured the stress distribution of the knee joint under different degrees of rotation deformity. Results Under a vertical load of 400 N, the difference between the medial and lateral stress of the knee joint was significantly different between the different tibia deformities (P<0.05), and the medial stress of the knee joint was higher than the lateral stress. The current study showed that there were statistically significant differences in the medial stress on the knee joint at all angles (including the neutral position of 0 degrees) (F=89.753, P<0.001) . There was a statistically significant difference in the lateral stresses of the knee joint between different rotation deformities (including the neutral position of 0 degrees) (F=102.998, P<0.001). Conclusions Residual rotation deformity after fracture of middle and upper tibia can lead to poor alignment of lower limb force and change of articular contact characteristics of knee joint, especially external rotation of tibia.Therefore, orthopedic surgeons should correct the malalignment of lower limbs to the greatest extent and reduce the rotation deformity as far as possible.

scholarly journals Rotation Distortion Syndrome of Ankle Joint and Knee in Car Drivers and Passengers

2021 ◽  
Vol 4 (1) ◽  
Keyword(s):  
Czech Republic ◽  
Knee Joint ◽  
Hallux Valgus ◽  
Ankle Joint ◽  
Joint Pain ◽  
Pain Syndrome ◽  
Valgus Deformity ◽  
Brain Dysfunction ◽  
Front Part ◽  
Minimal Brain Dysfunction

The most common feet pathologies of children are valgus and valgus planus deformities, which are congenital or connected with neurological dysfunctions (Minimal Brain Dysfunction). In adults, and mostly in women, we observe: 1. Köhler’s disease among girls wearing improper shoes. 2. Insufficiency and pain of the front part of feet connected with limited toes flexion, 3. Valgus deformity of the big toes (hallux valgus), 4. “Ankle Joint Pain Syndrome” (AJPS)-sometimes also “Knee Joint Pain Syndrome” (KJPS)-described by us only in USA, India and Czech Republic. In presented article, we describe this special type of foot insufficiency- “instability of ankle or knee, or both joints”-on left leg in drivers and right leg in passengers in countries with right-hand traffic. More frequent it concerns the foot and article focus on this problem.

scholarly journals Numerical analysis of stress distribution generated in spherical polyethylene inserts by knee joint endoprotheses’ sleds

2019 ◽  
Vol 21 (2) ◽  
pp. 1-5
Author(s):  
Marcin Nabrdalik ◽  
Michał Sobociński
Keyword(s):  
Numerical Analysis ◽  
Finite Elements ◽  
Stress Distribution ◽  
Knee Joint ◽  
Titanium Alloys ◽  
Numerical Method ◽  
Ti6al4v Alloy ◽  
Finite Elements Method ◽  
Weak Points ◽  
Metal Materials

Abstract The paper presents analysis of stress distribution in the friction node of knee joint endoprosthesis where sleds are made of various titanium alloys and CoCrMo cooperate with spherical polyethylene inserts. Currently used titanium alloys consists of Nb, Ta, Zr or Mo and with lesser value of Young’s modulus than Ti6Al4V alloy, or steel CoCrMo, which significantly varies from other metal materials. The obtained results make it possible to indicate the “weak points” of the accepted solution, and thus counteract the subsequent effects resulting from premature wear of endoprosthesis elements. The analysis was conducted with numerical method of ADINA System 8.6. The Finite Elements Method allowed to compute and present stress distribution quickly in all elements of the model.

scholarly journals Biomechanical Study of Artificial Knee Joint.

1991 ◽  
Vol 57 (542) ◽  
pp. 2555-2559 ◽  
Author(s):  
Yoshio SHIRASAKI ◽  
Tetsuya TATEISHI ◽  
Toru FUKUBAYASHI
Keyword(s):  
Knee Joint ◽  
Biomechanical Study

Stress Distribution in an Artificial Cruciate Ligament during the Gait Cycle

2014 ◽  
Vol 601 ◽  
pp. 167-170
Author(s):  
Lucian Bogdan ◽  
Cristian Sorin Nes ◽  
Angelica Enkelhardt ◽  
Nicolae Faur ◽  
Carmen Sticlaru ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Knee Joint ◽  
Gait Cycle ◽  
Cruciate Ligament ◽  
Element Analysis ◽  
Proposed Model

This paper presents a finite element analysis in order to determinate the stress distribution in an proposed model of the artificial cruciate ligament of the knee joint during the gait cycle.

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