Risk factors for and prevention of chronic pain and sensory disorders following inguinal hernia repair.

Background: Inguinal hernia repair is one of the most common surgical procedures in man. Immediate postoperative pain is an important issue that can delay hospital discharge. Besides, the presence of chronic pain after herniorrhaphy, which can affect up to 50% of patients, is a growing concern. However information regarding the precise etiological factors of this chronic postoperative pain is lacking. One factor thought to contribute to post herniorrhaphy chronic pain is the surgical procedure for inguinal hernia repair used by the surgeon.
Materials and Method: The study was conducted over a period of 5 years and included 1000 consecutive patients operated with inguinal hernia. Each patients completed a questionnaire about the presence or absence of pain or sensory disorders. After completed only 365 of patients remains in the study. From this patients, a total of 38 had different intensity of pain. From those, 13% were operated through an tissular procedure, whereas the laparoscopic procedure was responsible only for 7% of the patients with chronic postoperative pain. Most of the patients had mild or moderate pain and only one patient experienced severe pain. According to the type of procedure performed, in 25 patients were used the tissular procedure and only 12 patients with laparoscopic hernia repair had chronic pain.
Conclusion: The etiology of chronic groin pain post hernia repair is related in part to nerve injury. This is supported by the high frequency of sensory symptoms and numbness in these patients. However other factors including the role of tissue injury and inflammatory postoperative changes need to be considered.
Key Words: Chronic postoperative pain, Inguinal hernia repair, Open surgery, Laparoscopic surgery.