Scoring Systems in Pyogenic Spondylodiscitis—A Narrative Review

Background: Pyogenic spondylodiscitis has become increasingly common over the past two decades, and its nonspecific presentation, together with frequent diagnostic delay, makes severity assessment, prognosis, and surgical decision-making difficult to standardize based on clinical judgement alone. Methods: This narrative review was based on a targeted literature search through August 2026, combining terms for spondylodiscitis and vertebral osteomyelitis with the names of individually identified scoring systems and validation-related terms, distinguishing development from reliability testing and independent external validation. Results: Several disease-specific tools addressing severity, prognosis, or the decision to operate were identified. The most extensively evaluated treatment-decision tool showed moderate-to-good, if variable, performance across cohorts, while another frequently cited score performed less consistently in an independent population. One severity classification showed confirmed reliability but more limited predictive evidence, and mortality-prediction tools remain independently unvalidated. Conclusions: No single system currently demonstrates consistent performance across severity assessment, prognosis, and surgical decision-making. Existing tools should therefore be applied within the specific clinical context for which they were developed, while further independent external validation is needed before broader clinical implementation.