[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

MIDI based pacing music was made. This auditory stimulation gave cue and pace to locomotion. MIDI based pacing music which drum-bass part was strengthened beat, was compared with MIDI music without drum-bass part and clicking sound of metronome. And clicking sound of metronome was clearest. Pacing music which drum-bass part was strengthened beat was effective, when the information of pace is reflected in gait. And it can sustain concentration of the subject longer than monotonous clicking sound of metronome.

View full abstract

This study was intended to determine the thrust mechanism during underwater dolphin kick using a simulation model SWUM (SWimming hUman Model). The input data for the simulation were measured for 8 elite competitive swimmers. The SWUM was applied to recreate the dynamics of the underwater dolphin kick on the simulation. The thrusts and joint torques generated during underwater dolphin kick were simulated using the applied SWUM. The results showed that the feet mainly generated the thrust and not only joint torques of low limbs but also trunk was very important to generate the thrusts. Furthermore, it was suggested that one of the reason many butter.y swimmers had a low back pain was cyclic large torques generation by the trunk during underwater dolphin kick.

View full abstract

The primary fixation of cementless hip prostheses is related to the shape of stem. When there is complicated loading in the rotational direction, the mechanical fixation of hip stem is considered to provide a good primary fixation. The purpose of this study was to evaluate whether the IMC stem with a characteristic fixation, which was developed by a group at Kitasato University, contributes to primary fixation by finite element analysis.
Analysis was performed at a friction coefficient of 0.1 with automatic contact, under the restriction of the distal femoral end. The following three loading conditions were used: i) step loading of the joint resultant force in the region around the hip stem, ii) loading in the rotational direction, simulating distortion, and iii) loading of the weight that is loaded on femoral head during walking. The displacement of the IMC stem in the x-, y-, and z-axis directions and rotational direction was calculated by simulation, and the stress of the stem and bone was determined.
The rotational displacement, which is a clinical problem in hip prosthesis stems, was lower in the IMC stem than in other stems reported. The displacement of the IMC stem in the z-axis direction was low, indicating a low risk of sinking. The inter-locking, which is characteristic of the IMC stem, functioned to suppress its rotation, indicating that the locking method of this stem contributed to the rotational stability. Since no stress concentration was detected in certain regions, it was considered that there are no risks of the breakage of the IMC stem and bone. It was suggested that a good fixation of the IMC stem can be obtained because the stress level is appropriate for the primary fixation.

View full abstract