Background Many scoring systems that predict overall patient survival are based on clinical parameters and primary tumor type. To date, no consensus exists regarding which scoring system has the greatest predictive survival accuracy, especially when applied to specific primary tumors. Additionally, such scores usually fail to include modern treatment modalities, which influence patient survival. This study aimed to evaluate both the overall predictive accuracy of such scoring systems and the predictive accuracy based on the primary tumor. Methods A retrospective review on spinal metastasis patients who were aged more than 18 years and underwent surgical treatment was conducted between October 2008 and August 2018. Patients were scored based on data before the time of surgery. A survival probability was calculated for each patient using the given scoring systems. The predictive ability of each scoring system was assessed using receiver operating characteristic analysis at postoperative time points; area under the curve was then calculated to quantify predictive accuracy. Results A total of 186 patients were included in this analysis: 101 (54.3%) were men and the mean age was 57.1 years. Primary tumors were lung in 37 (20%), breast in 26 (14%), prostate in 20 (10.8%), hematologic malignancy in 18 (9.7%), thyroid in 10 (5.4%), gastrointestinal tumor in 25 (13.4%), and others in 40 (21.5%). The primary tumor was unidentified in 10 patients (5.3%). The overall survival was 201 days. For survival prediction, the Skeletal Oncology Research Group (SORG) nomogram showed the highest performance when compared to other prognosis scores in all tumor metastasis but a lower performance to predict survival with lung cancer. The revised Katagiri score demonstrated acceptable performance to predict death for breast cancer metastasis. The Tomita and revised Tokuhashi scores revealed acceptable performance in lung cancer metastasis. The New England Spinal Metastasis Score showed acceptable performance for predicting death in prostate cancer metastasis. SORG nomogram demonstrated acceptable performance for predicting death in hematologic malignancy metastasis at all time points. Conclusions The results of this study demonstrated inconsistent predictive performance among the prediction models for the specific primary tumor types. The SORG nomogram revealed the highest predictive performance when compared to previous survival prediction models.
Introduction: Patients who sustained thoracolumbar spine fracture without neurological deficit often require surgical treatment. The conventional open posterior approach had some disadvantages including post-operative pain, blood loss, and duration of the operation. The minimally invasive approach, open muscle-preserving pedicle screw fixation, was proposed to have more benefit than the conventional approach. This study evaluated the clinical and perioperative outcomes of thoracolumbar burst fracture fixation using the open muscle-preserving approach and the conventional open posterior approach. Methods: A prospective cohort study from June 2016 to June 2017 of the open muscle-preserving pedicle screw fixation approach was done compared to the historical control of the conventional open posterior approach from May 2015 to May 2016. The post-operative pain score, blood loss, duration of operation and clinical outcome were analyzed. Results: Twenty-three patients were enrolled in the muscle-preserving approach group, and 27 patients treated with the conventional open posterior approach were the control group. Post-operative VAS was significantly better in the muscle-preserving group (P<0.001). The mean operating time was significantly shorter in the muscle-preserving group (60.4±17.3 min. vs. 90.9±18.9 min., p<0.001). Moreover, the mean intra-operative blood loss of the muscle-preserving group was also significantly lower (156.96±96.3ml. vs. 269.26±147.6ml., p=0.003). Conclusion: Our study results indicate a superiority of the open muscle-preserving approach over the conventional open posterior approach for a thoracolumbar burst fracture without neurologic injury in terms of post-operative pain score, blood loss and duration of operation. The open muscle-preserving approach is an alternative treatment for thoracolumbar burst fractures.
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