Evaluation of carbon fibres in comparison to polyglycolic acid sutures and silk sutures for internal fixation of the stifle joint, in addition to the external fixation, after the experimental transection of the cranial cruciate ligament was performed in 12 dogs. The clinical, postmortem and histopathological findings were discussed. While no remarkable differences were observed clinically between the cases where the different materials were used for the internal fixation of the stifle joint, the least inflammatory reaction and most mature fibrous tissue were evident microscopically in those cases which were operated using carbon fibres.