The goal of treating metastases is to preserve stability and neurological function while reducing pain. The actual standard of care is stereotaxic body radiation therapy (SBRT) alone in non-surgical patients. The added value of vertebroplasty to SBRT is not well documented in the literature, nor whether performing vertebroplasty before radiotherapy treatment leads to a reduction in the rate of fractures and post-SBRT pain.

Inclusion Criteria:

• Histological evidence of cancer.
• Spinal and vertebral bone metastases (T5 to L5) documented by imaging.
• Pain related to metastases ≥ 4 on a numerical scale 0-10.
• Karnofsky performance index > 60 (ecog 0-2)
• Candidate for SBRT
• Less than 3 consecutive levels reached.
• Ability to complete follow-up questionnaires regarding pain, analgesics, and quality of life assessment.
• Potentially unstable lesions according to the spinal instability neoplastic score (SINS) scale (> or = 7)

Exclusion Criteria:

• Pregnancy or breastfeeding.
• Contraindications to MRI.
• Histology: myeloma, lymphoma or plasmacytoma.
• Radiotherapy prior to the level to be treated.
• Previous surgery at the site to be treated.
• Surgical indication:

spinal instability neoplastic score (SINS) > 13 or according to tumor board consensus.

Bilsky score > or = 2 Severe or progressive neurological signs (motor, incontinence).

• Lesion too large for safe vertebroplasty.
• High thoracic location not allowing safe visibility in fluoroscopy to perform vertebroplasty (T4 and above).
• Non-reversible coagulation disorders.
• Uncontrolled local or systemic infection.
• Estimated survival of less than 6 months.
• Inability or refusal to undergo SBRT treatment or vertebroplasty