Introduction

Determining the ideal bone cement vertebroplasty dosage is critical for achieving clinical success in patients with osteoporotic lumbar compression fractures. While percutaneous vertebroplasty (PVP) remains a primary surgical intervention for pain relief, some patients continue to experience unsatisfactory outcomes. Consequently, researchers have turned to biomechanical modeling to understand how injection volume and cement distribution influence the spinal microenvironment.

The Finite Element Biomechanical Study

A recent study utilized a finite element analysis to evaluate five distinct bone cement filling models based on CT data from a patient with an L1 fracture. Specifically, the researchers constructed thoracolumbar fracture models using 4 mL, 6 mL, and 8 mL of bone cement. Additionally, the 4 mL and 6 mL models were categorized into lump and discrete distribution types to compare their efficacy. During the analysis, the team applied axial loads and torque to simulate weight-bearing and various spinal movements, such as bending and rotation.

Impact of Bone Cement Vertebroplasty Dosage on Spinal Stress

The results revealed significant differences in stress values depending on the volume injected. Notably, the 8 mL lump bone cement model showed the minimum Von Mises stress during upright and left bending states. However, when comparing identical volumes, the researchers found no significant difference in stress levels between lump and discrete distribution models. Therefore, the total volume appears to be a more influential factor than the physical shape of the cement distribution within the vertebral body.

Clinical Implications for Surgeons

The study highlights that a low volume, such as 4 mL of bone cement, may fail to improve the biomechanical microenvironment of the spine. Consequently, the authors recommend injecting as much bone cement as safely possible to ensure spinal stability. Nevertheless, patient safety remains paramount. Surgeons must stop the injection immediately if they detect any signs of cement leakage. This approach balances the need for structural support with the prevention of potential complications.

Frequently Asked Questions

What is the recommended volume for bone cement in vertebroplasty?

This study suggests that higher volumes, specifically up to 8 mL, provide better biomechanical stability compared to 4 mL or 6 mL. However, clinicians should always adjust the volume based on individual vertebral capacity and the risk of leakage.

Does the distribution shape of the cement affect the outcome?

According to this biomechanical analysis, there is no significant difference in stress reduction between lump and discrete distribution types at the same volume. The total amount of cement is a more significant predictor of stability.

When should a surgeon stop the injection?

Injection should be stopped immediately if there is any visualization of cement leakage into surrounding tissues or blood vessels, regardless of whether the target volume has been reached.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or establish a doctor-patient relationship. Refer to the latest local and national guidelines for clinical practice.

References

Yao G et al. Optimal Dosage and Distribution of Bone Cement in Vertebroplasty: A Finite Element Analysis. Clin Spine Surg. 2026 May 27. doi: 10.1097/BSD.0000000000002091. PMID: 42202308.

Martinčič D et al. Minimum cement volume for vertebroplasty. International Orthopaedics (SICOT). 2015;39:727–733. doi: 10.1007/s00264-014-2620-7.

Zhang L et al. Biomechanical comparison of different bilateral percutaneous vertebroplasty in treating osteoporotic vertebral compression fractures: finite element analysis. Frontiers in Bioengineering and Biotechnology. 2024. doi: 10.3389/fbioe.2024.1352528.