Experimental studies on the use of a cushioned plate for internal fixation.

Internal fixation is widely used in the operative treatment of fractures, but various problems, such as local osteoporosis, may occur when living bone is fixed with a rigid metal plate. We propose a new method of immobilisation, which we have termed "cushioned plate fixation", in an attempt to solve some of these problems. Cushioned plate fixation involves a silicone rubber cushion placed between the steel plate and the bone. On the basis of data obtained from animal experiments in vivo and mechanical tests in vitro, we conclude that the cushion is effective in preventing osteoporosis without decreasing the strength of fracture fixation. We believe that this method might improve the mechanical biocompatibility of plate fixation.