Excellent result for the first 12 months 84%, dropped to 70% at 48 months. Still better in the 1st year than 5 other therapies, we compared in a study. 

Thank you for your answer. Why a covered stent has better results than a not-covered stent (or a DEB) in SFA steno-occlusive disease management ?

I think that at one time Viabahn stents were useful in long subintimal recanalizations where you would have to leave behind a very irregular lumen. We published our results showing about 80% two-year patency. However, with drug-eluting balloons and certainly with drug-eluting stents, those results are easily matched without resorting to covered stents. Currently we only use them for arterial perforations or ruptures.

Verta MJ, Schneider JR, Alonzo M, Hahn D. Percutaneous Viabahn-assisted

    recanalization for severe superficial femoral artery occlusive disease. Presented

    to the Society of Interventional Radiology Annual Meeting, Seattle,

   Washington, May 2007. JVIR 2008, 19:493-98

In my experience covered stents offer improved long term patency in TASC C and D fempop lesions in pts with disabling claudication (obviously good run off plays a positive role). Especially for fempop CTOs choose/insist on  intraluminal vs subintimal recanalizaton for better mid/long term outcome. On the contrary for CLI pts covered stents are questionable over other methods (DCBs, bare nitinol stents, atherectomy, alone or in combination); furthermore in CLI pts (especially old frail ladies) larger size sheaths needed for  covered stents  are responsible for an increased risk of access site bleeding complications.

Thak you for your answer ! What do you thik about the risk of loss of collateral circulattion related with use of covered stenst in cases of diffuse SFA lesions   ?

I think that the risk is very small, and should not affect your decision to technically optimize your procedure.  However as I said in CLI pts with diffuse SFA disease and probably poor tibial runoff I would avoid implanting a covered stent.