Cubital tunnel syndrome is a well-known neuropathy of the upper limb caused by ulnar nerve entrapment at the elbow (O’Driscoll et al., J Bone Joint Surg Br 73:613–617, 1991). The cubital tunnel (Mariani et al., Arthroscopy 15:218–222, 1999) is an osteofibrous structure with a bony pavement, delimited by the medial epicondyle and laterally by the olecranon. The roof is formed by Osborne’s arcuate ligament or Osborne’s band (Apfelberg and Larson, Plast Reconstr Surg 51:76–81, 1973). The ulnar nerve can be compressed in the osteofibrous tunnel by the bone structures, Osborne’s ligament, and the fascia of the ulnar flexor muscle of the carpus or the aponeurosis of the deep flexor of the fingers. The reduction in volume of the cubital tunnel is associated with a limited ulnar nerve flow during dynamic maneuvers and an increase in intra- and extraneural pressure (O’Driscoll et al., 73:613–617, 1991; Mariani et al., Arthroscopy 15:218–222, 1999; Apfelberg and Larson, Plast Reconstr Surg 51:76–81, 1973; Dangles and Bilos, Am J Sports Med 8:443–445, 1980). A rise in pressure values up to double or triple the norm (>50 mmHg) causes blocking of the intraneural circulation (Dellon, J Hand Surg Am 14:688–700, 1989) with electrodiagnostic modifications and clinical symptoms (Froment, Bull Hosp Joint Dis 33:193–196, 1972). Histological studies (Dellon and Mackinnon, J Reconstr Microsurg 4:179–184, 1988; Ogata and Naito, J Hand Surg Br 11:10–14, 1986; Dellon, J Hand Surg Am 14:688–700, 1989) have shown pathological changes in the segment of the ulnar nerve in patients with clinical signs of neuropathy of the ulnar nerve without evidence, on electronic microscopy, of lesions in the segments located 5 cm proximal and distal to opening of the cubital tunnel; severe demyelination was observed in the section of the nerve just proximal to the cubital tunnel. Surgery is essential when rehabilitation and physical therapy have failed. Various surgical techniques have been reported in the literature for the treatment of the ulnar neuropathy at the elbow (Froment, Bull Hosp Joint Dis 33:193–196, 1972; Buzzard, Lancet 199:317–319, 1922; King and Morgan, J Bone Joint Surg Br 41-B:51–55, 1959; Lim et al., Ann Acad Med Singapore 21:689–693, 1992; Miller, Ann Neurol 6:56–59, 1979; Nathan et al., J Hand Surg Br 20:628–637, 1995).