Plasty of the anterior wall of the inguinal canal during herniotomy is considered the main risk factor for recurrent inguinal hernia. Plasty of the posterior wall of the inguinal canal for oblique inguinal hernia is simultaneously a prophylactic measure to prevent the development of direct inguinal hernia in future. 5 types of relapses are defined depending on the localization, tactical and technical mistakes during herniotomy. Plasty of the posterior wall of the inguinal canal and suturing of uniform tissues without tension are considered as prophylactic measures to prevent hernia relapse.