Clinical Efficacy and Safety of Zoledronic Acid Combined with PVP/PKP in the Treatment of Osteoporotic Vertebral Compression Fracture: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

Figure 2

The methodological quality of the included studies. Risk of bias summary (a) and risk of bias graph (b): +: low risk of bias; −: high risk of bias; and ?: unclear risk of bias.