Higa Masaru

Titanium tends to seizure with other metals, so titanium unfits thread rolling for dental implant with φ3mm diameter or less. Therefore we lubricate the contact point and prevent the seizure by applying a textured surface on the die. We were examined for the textured surface for reducing the shear stress by plastically deformed analysis between titanium material and die, and fluid analysis of the oil around the textured surface. From this analysis, texture provides an effective of low-friction, and a dimple type texture reduces shear stress by 28%.

This study is aimed to show if hip joint loads during walking could be reduced by a slight gait modification. Six healthy adult subjects (mean (SD) age 22 (0.0) years, mean (SD) height 1.68 (0.04) m, mean (SD) weight 60.2 (7.9) kg) took part in this study. A series of normal walking trials at a self-selected speed (step length and cadence) and stride width were performed. After subjects had gait retraining during in which they were asked to alter their stride width by increasing abduction angles without changing any other kinematics. Subjects walked 10 trials for each gait pattern. A total of 20 trials were performed. Experimental gait data (joint angles and ground reaction forces) and musculoskeletal computer models were used to quantify individual hip joint moments. We used adduction moments as an indicator of internal hip joint loads. An inverse dynamics approach was also used to calculate the hip moments during a stance phase. Changes in abduction angles did not have any effect on the shape of the hip adduction moment curve but changed its peak mean magnitudes. In conclusion, we showed that a modified gait pattern can reduce the hip adduction moment. Given the results of this study, we believe that gait retraining may be an acceptable, noninvasive option for the treatment of patients of OA.