Bone structure can change by remodeling to adapt to mechanical status. Such change can result in bone affecting the long-term stability of the stem. The objective of this study was to propose a method to evaluate mechanical adaptation for preoperative planning of total hip arthroplasty. Finite element models of preoperative planning were examined in two ways: bone remodeling simulation and initial mechanical status of femur. A mathematical model of remodeling for long-term changes of bone was developed assuming that bone resorption/formation could be distinguished by strain magnitude of bone. Also, initial compatibility between stem and bone was set with four strain levels based on mechanostat theory. The results of bone remodeling simulation were shown average equivalent stress change was mainly observed in Gruen zone 1 and zone 7 where stress shielding or bone resorption could occur. The proportion of this value was the smallest in the first choice of the stem by a specialist surgeon. Also, these are showed same tendency with evaluation of initial strain distribution results that Gruen zone 1 and 7. Initial strain distribution after total hip arthroplasty was correlated with the long-term change of bone structures after total hip arthroplasty. Bone structure changes around prostheses occur due to changes in the mechanical environment, and this is correlated with strain distribution of immediate post-operative model. Findings of this study suggest that biomechanical indices might be useful for exploring difference in long-term fitting among different surgical plans.

骨骼结构可以通过重塑而改变，以适应机械状态。这种变化会导致骨骼影响茎的长期稳定性。本研究的目的是提出一种评估机械适应性的方法，以进行全髋关节置换术的术前计划。术前计划的有限元模型以两种方式进行检查：骨骼重塑模拟和股骨的初始力学状态。假设骨骼的吸收/形成可以通过骨骼的应变幅度来区分，则开发了用于骨骼的长期变化的数学模型。同样，基于机械稳压器理论，通过四个应变级别设置了茎和骨之间的初始兼容性。骨重建模拟的结果表明，平均等效应力变化主要发生在可能发生应力屏蔽或骨吸收的Gruen 1区和7区。该值的比例在专科医生的首选中是最小的。同样，在评估初始应变分布结果时，这些也显示出与Gruen 1区和7区相同的趋势。全髋关节置换术后的初始应变分布与全髋关节置换术后的骨结构的长期变化相关。假体周围的骨结构变化是由于机械环境的变化而发生的，这与术后即刻模型的应变分布有关。