Bone metastases from hepatocellular carcinoma: Guidance on the management of spinal and long bone lesions

Bone metastasis from hepatocellular carcinoma (HCC) is a marker of advanced disease and a potential cause of preventable functional loss. HCC skeletal lesions are commonly osteolytic and may be hypervascular, creating risks of pathological fracture, spinal instability, metastatic spinal cord compression (MSCC), neurological deficit, and loss of ambulation. This structured narrative review integrates HCC-specific clinical evidence with established orthopedic and spine oncology frameworks to identify when specialist consultation should occur before irreversible skeletal or neurological deterioration. Retrospective HCC cohorts indicate that the spine is frequently involved, that surveillance-detected metastases were associated with a lower observed frequency of fracture or paralysis than symptom-detected metastases, and that hepatic reserve was associated with outcomes after skeletal surgery. Because direct HCC-specific comparative evidence remains limited, the Spinal Instability Neoplastic Score (SINS), epidural spinal cord compression (ESCC)/Bilsky grading, the neurological, oncological, mechanical, and systemic (NOMS) framework, prognostic scores, Patchell's MSCC evidence, and Mirels score are used as communication aids rather than disease-specific operative thresholds. We propose a conceptual four-pathway triage model for neurological emergency, spinal mechanical failure, long-bone fracture risk, and pelvic or acetabular weight-bearing failure, followed by a systemic-fitness assessment incorporating liver reserve, hemostatic status, prognosis, rehabilitation potential, and patient goals. The framework is intended to accelerate multidisciplinary assessment, not to prescribe surgery.