Femoral-Popliteal Bypass
What the Examiner Expects
Surgical bypass from the common femoral artery to the popliteal artery (above- or below-knee) for peripheral arterial disease. The examiner expects you to know the Rutherford classification for chronic limb ischemia, understand that great saphenous vein (GSV) is the best conduit (5-year patency 70–80% vs 50–60% for prosthetic at the above-knee level), and describe the technique: expose the CFA and popliteal artery, harvest or prepare the GSV, create proximal and distal anastomoses end-to-side, and confirm graft patency with completion angiography or duplex.
Key Examiner Focus Points
- Indicated for lifestyle-limiting claudication or critical limb ischemia (rest pain, tissue loss)
- Great saphenous vein (reversed or in situ) is the preferred conduit — superior patency vs prosthetic
- Above-knee popliteal: PTFE is acceptable if no vein; below-knee: autologous vein is strongly preferred
- Preop assessment: ABI, duplex ultrasound, CTA or angiography for anatomic planning
- Vein mapping preoperatively to assess caliber and suitability
Common Curveballs
The great saphenous vein is unsuitable (prior stripping, varicosities, too small)
Alternative autologous conduits: lesser saphenous vein, arm veins (cephalic, basilic), or composite/spliced vein segments. For above-knee targets, PTFE with a vein cuff (Miller cuff) at the distal anastomosis is acceptable. For below-knee or tibial targets, every effort should be made to find autologous vein — prosthetic grafts to tibial arteries have poor patency.
6 months postop, the patient develops recurrent symptoms and duplex shows a stenosis at the distal anastomosis
Intimal hyperplasia — the most common cause of graft failure in the first 2 years. If stenosis > 70%, intervene before graft thrombosis: patch angioplasty, jump graft, or percutaneous balloon angioplasty with possible stent. Surveillance duplex every 3–6 months is critical for early detection.