Artificial ureteral calculosis was produced by the injection of dental cement in anesthetized rats. EMG activities of body trunk and medial thigh muscles were recorded immediately after the operation using bipolar wire electrodes. Then vocalization thresholds were measured by electrical stimulation of the muscle using the same implanted electrodes. After the operation long-lasting periodic increases of the EMG activities were observed and decreases of pain thresholds were also observed in the same muscles.
These results suggest that artificial ureter calculosis rats are useful experimental model for the further study on the tender points formation.