Surgical treatment of lumbar and sacral plexus lesions is very rarely reported in the literature. The incidence of the involvement of these nervous structures in traumatic lesions of different etiology is probably much higher than believed, and surgical treatment should be taken into consideration more often. In this paper the experience derived from the surgical treatment of 15 cases is reported. Different surgical approaches have been employed according to ethiology, to level of nerve lesion and concomitant lesions of other organs. Patients who suffered a lesion in the lumbar or sacral plexus may have a very severe problem with deambulation since the leg may not be stable or may be unable to withstand the weight of the body. Pain syndrome in these patients may be a very severe obstacle to rehabilitation programs and to deambulation and everyday activity. Microsurgical nerve treatment in the retroperitoneal space is demanding both for the surgeon and for the patient but neurolysis and grafting procedures are possible also in this area. The resulting improvement of motor performance and the relief of pain are strong arguments in favor of this choice. Muscles benefitting most from surgery are the gluteal and femural muscles; more distant muscles, and particularly the anterior tibial nerve dependent muscles will gain minimal benefit from surgery. The relief from pain is relevant in all cases.