Lower extremity reconstruction is the most unforgiving testing ground in plastic surgery — every decision is graded by whether the patient can bear weight, walk, and protect a sensate foot for the rest of their life.

In this episode of Plastics in Practice, we walk through the core principles of lower extremity salvage: the zone-of-injury concept, when to fix vs. amputate, fracture management, soft-tissue coverage by leg third, and the trade-offs between limb salvage and a well-fit below-knee amputation.

Key takeaways

• Salvage is judged against amputation, not “normal.” The goal is a limb more functional than a prosthesis — loss of the tibial nerve and plantar sensibility is a relative contraindication.
• Stabilize the skeleton first. Vascular and nerve repairs done before fixation are routinely disrupted during fracture reduction; external fixation is the workhorse for grade IIIB / IIIC injuries.
• Early soft-tissue coverage wins. Closure within 72 hours of injury carries the lowest complication rate; delayed closure (1–6 weeks) climbs to ~50%.
• Match the flap to the leg third: gastrocnemius proximal, soleus middle, free tissue distal.
• Bone gaps have a tiered answer: cancellous graft for short defects, Ilizarov distraction for 4–8 cm gaps, vascularized fibula up to ~24 cm.
• VAC therapy buys time, not closure. It improves the bed and reduces flap size, but use beyond 7 days is associated with higher infection and amputation rates in IIIB tibias.
• BKA is a reconstructive choice, not a failure. It adds ~25% to the energy cost of ambulation vs. ~65% for AKA; preserve the knee whenever possible, including with a foot-fillet free flap from the amputated part.

This content is for educational purposes only and is not medical advice.

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