Major surgery for metastatic bone disease is not a risk for 30-day mortality: a population-based study from Denmark

BACKGROUND AND PURPOSE: Surgery for bone metastases in the appendicular skeleton (aBM) is a trade-off between limb function and survival. A previous study from a highly specialized center found that extended surgery is not a risk for 30-day mortality and hypothesized that wide resection and reconstruction might reduce postoperative mortality. The study aimed to investigate whether parameters describing the surgical trauma (blood loss, duration of surgery, and degree of bone resection) pose a risk for 30-day mortality in patients treated with endoprostheses (EPR) or internal fixation (IF) in a population-based cohort. PATIENTS AND METHODS: A population-based cohort having EPR/IF for aBM in the Capital Region of Denmark 2014–2019 was retrospectively assessed. Intraoperative variables and patient demographics were evaluated for association with 30-day mortality by logistic regression analysis. Kaplan–Meier estimate was used to evaluate survival with no loss to follow-up. RESULTS: 437 patients had aBM surgery with EPR/IF. No parameters describing the magnitude of the surgical trauma (blood loss/duration of surgery/degree of bone resection) were associated with mortality. Overall 30-day survival was 85% (95% confidence interval [CI] 81–88). Univariate analysis identified ASA group 3+4, Karnofsky score < 70, fast-growth primary cancer, and visceral and multiple bone metastases as risk factors for 30-day mortality. Male sex (OR 2.8, CI 1.3–6.3), Karnofsky score < 70 (OR 4.2, CI 2.1–8.6), and multiple bone metastases (OR 3.4, CI 1.2–9.9) were independent prognostic factors for 30-day-mortality in multivariate analysis. CONCLUSION: The parameters describing the surgical trauma were not associated with 30-day mortality but, instead, general health status and extent of primary cancer influenced survival post-surgery.