Lymphadiposal Flaps and Lymphaticovenular Anastomoses for Severe Leg Edema: Functional Reconstruction for Lymph Drainage System.

Background: Collecting lymphatics have lymph-drainage function with contraction of smooth muscle cells. Patients with edema have lost this drainage function due to degeneration of smooth muscle cells. Lymphaticovenular (LV) anastomosis salvages smooth muscle cells from reversible degeneration (mild edema), but muscle cells cannot be recovered from irreversible degeneration (severe edema). Therefore, in severe edema, LV anastomoses cannot reestablish the drainage function of the lymphatic system.To overcome this weakness of LV bypass methods for severe edema, new methods were instituted for repair of this missing drainage function using a lymphadiposal flap from the contralateral foot for hemilateral edema, or transfer of lateral thoracic lymph nodes for bilateral edema.
Methods: A total of 13 cases were repaired with lymphadiposal flaps and additional LV anastomoses. These cases have frequent phlegmon or cellulitis or resisted to previous LV anastomoses and/or compression therapy. The ages ranged from 15 to 75 years. There were four cases of primary edema and nine cases of secondary edema.
Results: Regarding the lymphadiposal flap (n = 8), three cases showed an excellent response (37.5%; no need for compression therapy), four cases had a good response (50%; improvement with compression), one case showed no change (12.5%; no improvement), and there were no cases of deterioration. Regarding the lateral thoracic lymph nodes transfer (n = 5), two cases had a good response (40%), three showed no improvement (60%), and there were no cases of deterioration.
Conclusion: It is concluded that lymphadiposal flap or lymph nodes transfer is suitable for severe edema having frequent cellulitis in unilateral or bilateral lower extremities resisting previous LV anastomoses and/or compression therapy.
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