PATHOLOGICAL FRACTURES RESULTING FROM NEOPLASMS WITHIN THE FEMUR ARE DISASTROUS TO ALL PARTIES INVOLVED AND IN MANY CASES COULD BE AVOIDED GIVEN EARLY DETECTION AND PREDICTIVE VALIDITY WITH RESPECT TO THE EXTENT OF THE LESION. IN PARTICULAR, PATHOLOGICAL FRACTURES OCCUR IN THE SUB- AND INTERTROCHANTERIC REGIONS OF THE FEMUR AS THESE ARE REGIONS OF UNIQUE STRESS CONCENTRATIONS AND FREQUENT SITES OF METASTASES.
APPLICATION OF FINITE ELEMENT MODELING HAS PROVIDED GREATER UNDERSTANDING OF LOAD TRANSMISSION AND SHEAR PROPERTIES THROUGHOUT THE FEMUR (REFERENCES 5 AND 17). OONISHI AND HASEGAWA (1982) USED A TWO-DIMENSIONAL FINITE ELEMENT ANALYSIS TO INVESTIGATE DIFFERENT STRESS PROPERTIES OF CORTICAL AND CANCELLOUS BONE REGIONS OF THE FEMUR, INTUITIVELY, BECAUSE THE FEMUR IS ASYMMETRICAL AND CURVED IN EACH PLANAR AXIS ONE WOULD EXPECT A THREE-DIMENSIONAL MODEL TO BE MORE GENERALIZABLE TO A REAL-WORLD SITUATION.
CROWNINSHIELD (1980) DEVELOPED A USEFUL 3-D MODEL TO RESOLVE GEOMETRICAL PROBLEMS INCURRED WITH TOTAL HIP RECONSTRUCTION. WITH THIS MODEL, AS ANY FINITE ELEMENT ANALYSIS, A GREATER NUMBER OF NODAL POINTS AND ELEMENTS YIELDS A MORE ACCURATE RESOLUTION OF LOAD STRESS/DISPLACEMENTS.
THE PRESENT STUDY UTILIZED THESE AND OTHER FACTORS IN SIMULATING A FEMUR PRESENTING METASTATIC LESIONS OF THE SUB- AND INTERTROCHANTERIC REGIONS. REMOVAL OF ELEMENTS IN THESE AREAS ALONG WITH THEIR INHERENT STIFFNESS/SUPPORT PROPERTIES TO THE MODEL THUS SIMULATED THE EFFECT OF NON-SUPPORTIVE TUMOR WITHIN OTHERWISE HEALTHY BONE.
在有限元建模的应用中,可以更好地理解整个载荷的传递和剪切特性(参考文献5和17)。 OONISHI和HASEGAWA(1982)使用二维有限元分析来研究股骨的骨质和松质骨区域的不同应力特性,这是因为在每个平面的二维平面上,女性都是不对称且弯曲的更适合现实世界的情况。 P>
CROWNINSHIELD(1980)开发了一种有用的3-D模型,以解决因完全髋关节重建而引起的几何问题。使用此模型,如进行任何有限元分析,结点和单元的数量越多,载荷应力/位移的解析度就越高。 P>
当前的研究利用了这些因素和其他因素来模拟次粗隆区和偏粗隆区的女性假性转移灶。去除这些区域中的元素以及它们对模型的固有刚度/支持特性,从而模拟了非支持性肿瘤对健康骨骼的影响。 P>
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