Outcomes of open midfoot amputation in people with #CLTI #Diabetic Foot @USC_Vascular @USC @KeckMedUSC

This study from our group led by Louis Zhang and Vince Rowe. The bottom line:

  • CKD Matters: all non-healers had severe chronic kidney disease and major adverse limb events (MALE) were 7.4-fold higher in people with CKD
  • 88.4% of patients healed at one year with open TMAs

Predictors of major adverse limb events after open forefoot amputation in patients with chronic limb-threatening ischemia

Annals of Vascular Surgery, 2020 / https://doi.org/10.1016/j.avsg.2020.01.099

Introduction
Management of patients with chronic limb-threatening ischemia (CLTI) and extensive foot necrosis presents a challenge for limb salvage. Our study evaluates preoperative risk factors that contributed to durability and efficacy of limb salvage after open transmetatarsal amputation (TMA) in patients with critical limb threatening ischemia.

Methods
We abstracted data from patients who underwent open TMA at Los Angeles County-University of Southern California Medical Center and Keck Hospital of University of Southern California from 2009 to 2018. Multivariable logistic regression analysis, adjusting for preoperative risk factors, was used to examine predictors of major adverse limb events (MALE). The aim was to evaluate outcomes following open TMA with MALE as the primary outcome. Our hypotheses were that outcomes would be worse for patients with foot infections and renal failure.

Results
Forty-three open transmetatarsal amputations were done in 39 patients during the study period The cohort had a mean age of 63+/-11.6 years, 89% had a history of diabetes, 95% hypertension (HTN), 54% had end stage renal disease (ESRD) and 26% were current smokers. MALE occurred in 39% of the cohort. Sex, race, indication, HTN, smoking status, and history of prior ipsilateral revascularization or minor amputations were not associated with MALE (P>0.05). Multivariate logistic regression found ESRD to be an independent predictor of MALE (OR 7.43 95%CI [1.12, 49.17] P=0.038) after adjusting for clinically significant covariates.

Discussion
Open TMA provides acceptable rates of limb salvage for complex patients with CLTI. ESRD is an independent risk factor MALE following open TMA in these patients. Vigilant follow-up is essential for this morbid patient population given poorer outcomes after forefoot amputation.

Keywords
Chronic limb threatening ischemiaamputationend stage renal diseaseopen transmetatarsal amputationgangrene

Open TMA with Integra graft placement

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