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Effectiveness of Selected Fitness Exercises on Stress of Femoral Neck using Musculoskeletal Dynamics Simulations and Finite Element Model.

Qian JG, Li Z, Zhang H, Bian R, Zhang S - J Hum Kinet (2014)

Bottom Line: The results of the finite element femur model showed that stress was localized along the compression arc and the tension arc.The results from this study indicate that the forward lunge may be an effective method to prevent femoral neck fractures.Walking is another effective and simple method that may improve bone mass of the Ward's triangle and prevent osteoporosis and femoral neck fracture.

View Article: PubMed Central - PubMed

Affiliation: Department of Sport Science, Nanjing Sport Institute, Nanjing, China.

ABSTRACT
The purpose of the study was to establish a dynamics model and a three-dimensional (3D) finite element model to analyze loading characteristics of femoral neck during walking, squat, single-leg standing, and forward and lateral lunges. One male volunteer performed three trials of the five movements. The 3D kinematic data were captured and imported into the LifeMOD to establish a musculoskeletal dynamics model to obtain joint reaction and muscle forces of iliacus, gluteus medius, gluteus maximus, psoas major and adductor magnus. The loading data LfeMOD were imported and transformed into a hip finite-element model. The results of the finite element femur model showed that stress was localized along the compression arc and the tension arc. In addition, the trabecular bone and tension lines of the Ward's triangle also demonstrated high stress. The compact bone received the greatest peak stress in the forward lunge and the least stress in the squat. However, the spongy bone in the femoral neck region had the greatest stress during the walk and the least stress in the squat. The results from this study indicate that the forward lunge may be an effective method to prevent femoral neck fractures. Walking is another effective and simple method that may improve bone mass of the Ward's triangle and prevent osteoporosis and femoral neck fracture.

No MeSH data available.


Related in: MedlinePlus

Stress location points around the femoral neck in the femur finite element model.
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f5-jhk-41-59: Stress location points around the femoral neck in the femur finite element model.

Mentions: The stress distribution across the femoral head and neck wass demonstrated in Figure 5. When the femoral neck is under a bending moment, the inferior arc of the neck experiences the largest compressive stress while the superior arc observes the largest tensile stress. Along the tensile and compressive arches a total of 16 and 17 location points were identified respectively (Figure 6). Figure 6 shows the compressive and tensile stress curves interpolated across the location points across the femoral neck. For the compression and tension curves of the five movements, it can be seen that the maximum stresses are concentrated in the middle of the curves in most of the three phases. The location point 8 received the greatest compressive stress on the compression arc whereas the location point 9 experienced the greatest tensile stress on the tension arc (Figure 6). Table 2 summarized the peak stresses observed at the location points of the compression and tension arc and at the intersection point of the compressive and tensile stress lines of trabeculae (node 19949 - the center of the Ward’s triangle) during three phases of the five movements.


Effectiveness of Selected Fitness Exercises on Stress of Femoral Neck using Musculoskeletal Dynamics Simulations and Finite Element Model.

Qian JG, Li Z, Zhang H, Bian R, Zhang S - J Hum Kinet (2014)

Stress location points around the femoral neck in the femur finite element model.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4120465&req=5

f5-jhk-41-59: Stress location points around the femoral neck in the femur finite element model.
Mentions: The stress distribution across the femoral head and neck wass demonstrated in Figure 5. When the femoral neck is under a bending moment, the inferior arc of the neck experiences the largest compressive stress while the superior arc observes the largest tensile stress. Along the tensile and compressive arches a total of 16 and 17 location points were identified respectively (Figure 6). Figure 6 shows the compressive and tensile stress curves interpolated across the location points across the femoral neck. For the compression and tension curves of the five movements, it can be seen that the maximum stresses are concentrated in the middle of the curves in most of the three phases. The location point 8 received the greatest compressive stress on the compression arc whereas the location point 9 experienced the greatest tensile stress on the tension arc (Figure 6). Table 2 summarized the peak stresses observed at the location points of the compression and tension arc and at the intersection point of the compressive and tensile stress lines of trabeculae (node 19949 - the center of the Ward’s triangle) during three phases of the five movements.

Bottom Line: The results of the finite element femur model showed that stress was localized along the compression arc and the tension arc.The results from this study indicate that the forward lunge may be an effective method to prevent femoral neck fractures.Walking is another effective and simple method that may improve bone mass of the Ward's triangle and prevent osteoporosis and femoral neck fracture.

View Article: PubMed Central - PubMed

Affiliation: Department of Sport Science, Nanjing Sport Institute, Nanjing, China.

ABSTRACT
The purpose of the study was to establish a dynamics model and a three-dimensional (3D) finite element model to analyze loading characteristics of femoral neck during walking, squat, single-leg standing, and forward and lateral lunges. One male volunteer performed three trials of the five movements. The 3D kinematic data were captured and imported into the LifeMOD to establish a musculoskeletal dynamics model to obtain joint reaction and muscle forces of iliacus, gluteus medius, gluteus maximus, psoas major and adductor magnus. The loading data LfeMOD were imported and transformed into a hip finite-element model. The results of the finite element femur model showed that stress was localized along the compression arc and the tension arc. In addition, the trabecular bone and tension lines of the Ward's triangle also demonstrated high stress. The compact bone received the greatest peak stress in the forward lunge and the least stress in the squat. However, the spongy bone in the femoral neck region had the greatest stress during the walk and the least stress in the squat. The results from this study indicate that the forward lunge may be an effective method to prevent femoral neck fractures. Walking is another effective and simple method that may improve bone mass of the Ward's triangle and prevent osteoporosis and femoral neck fracture.

No MeSH data available.


Related in: MedlinePlus