A method is designed to change geometrical proportions of muscles in the rat. After a tibial osteotomy, the application of a stainless steel prosthesis resulted in an elongation of about 8% of the tibia. In 23 out of 28 operated rats a correct application of the prosthesis was maintained till the rats were sacrificed. The operation caused hardly any muscle tissue damage. No disuse of the manipulated leg was observed in the operated rats.
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