The whole study is divided in 4 parallel protocols.The first protocole estimates the reliability of the technique through test-retest recordings. The second protol aims to prove that exercise Tcpo2 is efficient to estimate the benefit of proximal revascularisation on proximal and distal ischemia in patients suffering stage two lower extremity arterial disease. The third protocol aims at estimating with exercise tcpo2 the eventual apparison of proximal ischemia after aorto-bi-femoral bypasses. The last protocole is a transversal study of patients with aorto-bi-femoral bypasses aiming to analyse the presence of proximal and distal symptoms and ischemia.

The hypothesis for protocole 2 is that TcpO2 at exercise is significantly improved after surgery at the aortic and primary iliac artery. The hypothesis for protocole 3 and 4 relates on the hypothesis that a significant number of patients benefiting aorto-bi-femoral bypass suffer isolated proximal pain/ischemia after surgery.

Patients included are submitted to:

San Diego Claudication Questionnaire before and during the treadmill test Treadmill test(s) through the Strandness procedure (2MPh 10% slope) Transcutaneous oxygen pressure recording before during and after exercise Ankle and brachial pressure measurements

Inclusion Criteria:

• protocole 1 - 3 stage 2 claudication
• Protocoles 2 & 3 : Indication for surgery
• protocole 4 : Patent aorto bio femoral bypass for more than 4 months
• Ability to perform a treadlmill test

Exclusion Criteria:

• Stage 4 LEAD
• Aortic aneurysm
• Acute coronary syndrom
• claudication of documented non vascular origin (for protocoles 1-3 only)