Evaluation of Hepatic Rigidity by Ultrasonic Impulse Elastography in Liver Transplant Patients

Inclusion Criteria: * Men and women aged 18 years and over ; * Hepatic transplant patient attending a day hospital of hepatology as part of the systematic follow-up of liver transplantation at 1 year, 5 years or 10 years in order to benefit from a clinical examination, biological evaluation, hepatic ultrasound, Fibroscan and Hepatic Puncture-Biopsy ; * Patient in a position to receive information about the protocol ; * Patient having given his / her written consent. Exclusion Criteria: * Coagulation disorder (platelets \<60,000, Prothrombin Ratio \<50%, partial thromboplastin time \> 1.5 times the control unless explained by insufficient factor XII deficiency or anti-phospholipid antibodies); * Ascites; * Platelet antiaggregation taken the previous week biopsy, patient under anticoagulants; * Persons of full age who are subject to legal protection (safeguard of justice, guardianship, guardianship), persons deprived of their liberty; * Patient not affiliated to social security; * Pregnant or nursing women; * Simultaneous participation in another research.