Fig. 1

Kaplan-Meier survival curves for preoperative factors: (a) Preoperative ambulatory status, (b) ECOG performance status, (c) Number of involved vertebrae, (d) Visceral metastases, and (e) Time developing motor deficits
Kaplan-Meier survival curves for preoperative factors: (a) Preoperative ambulatory status, (b) ECOG performance status, (c) Number of involved vertebrae, (d) Visceral metastases, and (e) Time developing motor deficits