手指中手基節関節の形態学的研究
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概要
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A wide variety of MCP prostheses have been developed and used. However the kinematics of most prostheses is far from the normal MCP joint and the results of the prosthesis replacement were poor. To achieve the ideal function of the MCP joint, the kinematics of the prosthesis shoule be close to that of the normal joint and it is necessary to identify the geometry of the MCP joint to make the anatomical prosthesis. The objectives of this study are to investigate the anatomical characteristics of the MCP joint, and to develop a new technique to describe the articular surface in three dimension. The dry bone hand specimens were measured and the correlation of each parameter was investigated. Then a new method which can describe the articular surface in three dimension was developed and the shape of the MCP joint was described. The result shows that there is a single "scaling law" of the geometry of the MCP joint. It means that once the shape of the prosthesis is decided, the size of the prosthesis can be decided by following this law. The shape of the articular surface of the proximal phalanx is concave and the width of the articular surfac~ is larger than the depth. This study revealed that the shape of the articular surface is a part of the sphere and the center of the sphere is volar to the long axis of the of the proximal phalanx. These results are valuable to reduce the number of the shapes and sizes of the prosthesis, and the kinematics of the prosthesis will be close to the normal joint.
- 神戸大学の論文