The “Bank Finger” Principle in Hand Surgery—Retrospective Study vs. Systematic Review

Background/Objectives: The “bank-finger” or “spare-parts” principle offers an immediate reconstructive solution in mutilating hand injuries by repurposing viable tissues from non-salvageable digits to restore length, coverage, and function. Although described for decades, systematic evidence remains scarce. This study compared a single-center retrospective cohort with a systematic review of the specialized literature (2015–2025) to clarify the indications, reconstructive models, assessment of functional outcomes, and complication profiles associated with this technique. Methods: A retrospective analysis was performed on 35 adult patients treated for complex hand trauma between 2017 and 2024. It was compared with a systematic review of nine clinical studies identified across PubMed, Scopus, Embase, Web of Science, and Cochrane Library. Extracted variables included demographics, mechanisms of injury, type of tissues transferred, vascularization method, complications, and functional outcomes. Methodological quality was assessed using the Joanna Briggs Institute (JBI) criteria for case reports and case series. Results: Across 78 cases (43 from the literature and 35 institutional), vascularized fillet and osteo-cutaneous transfers constituted the predominant reconstructive approach, providing immediate skeletal stability and durable, sensate soft-tissue coverage. All flaps and grafts survived, and functional recovery was consistently favorable. In the retrospective cohort, standardized evaluation demonstrated excellent outcomes (mean DASH 14.6, MHQ 82.5, VAS 1.8). The overall complication rate remained below 10%, limited to transient venous congestion or mild postoperative stiffness. No infections, flap losses, or donor-site morbidity were reported. Conclusions: The bank-finger technique is a reliable, biologically efficient reconstructive strategy for acute mutilating hand trauma. When applied early and with appropriate tissue selection, it achieves outcomes comparable to conventional microsurgical options while avoiding additional donor-site morbidity. The present combined analysis highlights its reproducibility and underscores the need for prospective multicenter studies employing standardized functional metrics.