MMP9 and peripheral arterial disease: Sapienza P et al. analyzed plasma MMP-2 and MMP-9 levels in three groups of patients, those that underwent an infrapopliteal vein graft and midfoot amputation, others undergoing post-traumatic midfoot primary amputation without PAD, and in healthy controls with normal LDL-cholesterol levels and without atherosclerotic lesions (excluded by ultrasonography and ABI measurements).