The aim of this study is to evaluate the efficiency of the Neuroestimulation of the Posterior Tibial Nerve for the treatment of this syndrome.

A multicentric, prospective, randomized study will be performed in patients affected with severe LARS symptoms. Patients will be randomized in two groups:

1. Control group- placebo
2. Treatment group: neuroestimulation of the posterior tibial nerve

Inclusion Criteria:

• Patients older than 18 and under 75 years who have been undergone anterior resection of the rectum with sphincter preservation for rectal cancer
• Patients with LARS score > 29

Exclusion Criteria:

• Patient with intestinal inflammatory disease
• Patients with known irritable colon disease
• Pregnancy patients
• Patients with others intestinal resection segments different from the rectum
• Patients with metastatic disease
• Patient with previous history of posterior tibial neurostimulation or sacral nerve stimulation