A XXXX model in @entity95 .

@entity72372 @entity2249 @entity95 @entity174
A technique was developed to create a reproducible @entity2249 in vitro using 5-month-old JW/ @entity72372 series male @entity95 . Force attenuation of a newly developed damping material was also evaluated using this model. Ten pairs of the femora with smaller deviations in length and weight were harvested and cleaned of soft tissue. Either a right or left of each pair of the specimens was randomly selected and put into either the control or the experimental group, both of which contained equal numbers of the right and left femora. The specimens were attached to an L-shaped plate and embedded in a resin from the proximal diaphysis to the distal end so as to maintain a consistent position of the femora. They were mounted and fixed on a pedestal slanted in the coronal plane at 20 degrees. The impact load testing was conducted using an impact mallet dropped from a height of 3 cm. The impact load was applied onto the femoral head. To the specimens in the experimental group, attenuated impact forces were loaded through the damping material, but those in the control group were subjected to forces directly transmitted without the material. All the impact testing was performed in a temperature and humidity controlled chamber. All of the femoral specimens exposed to the direct impact forces (controlled group) sustained @entity174 at the neck. The @entity174 line passed from the base of the femoral head laterally and to the calcar area just proximal to the minor trochanter medially. The location of each @entity174 line was almost identical among the specimens. None of the specimens that were exposed to the impact force through the damping material (experimental group) sustained @entity174 macroscopically and roentgenographically.
