Kyphoplasty vs. Vertebroplasty: Rethinking Pain Management for Vertebral Compression Fractures

Vertebral compression fractures (VCFs), most often caused by osteoporosis, affect over 700,000 people annually in the United States alone, exceeding the number of hip and ankle fractures combined¹. VCFs are not only painful but can also lead to spinal instability, kyphotic deformity, reduced mobility, and ultimately increased morbidity if left untreated¹.

Two minimally invasive interventions, vertebroplasty and kyphoplasty, have emerged as key techniques in the management of osteoporotic VCFs. While both aim to stabilize fractures and alleviate pain, their methods, outcomes, and safety profiles differ in important ways. A systematic review of 69 clinical studies by Hulme et al. provides critical insight into the comparative performance of these procedures¹.

What Are Vertebroplasty and Kyphoplasty?

Vertebroplasty, first introduced in 1987, involves the percutaneous injection of polymethyl methacrylate (PMMA) cement into the fractured vertebral body to stabilize the structure and reduce pain¹. Kyphoplasty, developed a decade later, includes an initial step of inflating a balloon tamp within the vertebral body to restore height and reduce kyphosis before cement injection¹.

Both procedures are designed to interrupt the cycle of pain and immobility that accelerates bone loss and contributes to further fractures¹.

Pain Relief Outcomes

Pain relief is one of the primary goals of both interventions. According to the review:

• 87% of vertebroplasty patients reported pain relief
• 92% of kyphoplasty patients reported pain relief¹

Visual Analog Scale (VAS) pain scores dropped significantly:

• From 8.2 to 3.0 in vertebroplasty patients
• From 7.15 to 3.4 in kyphoplasty patients¹

Notably, only two nonrandomized studies compared these interventions to conservative management. In one, vertebroplasty provided immediate pain reduction compared to control, though outcomes converged by 6 weeks¹. In the second, kyphoplasty was superior to conservative care at 6 months for chronic fractures¹.

Functional Improvement and Mobility

Several studies included in the review reported improved physical function following both procedures, though the metrics used were inconsistent.

• Vertebroplasty was associated with 16%–47% improvement in physical function using mobility scales¹.
• In studies using validated tools like the Oswestry Disability Index (ODI), scores improved from 61% pre-op to 46% post-op¹.
• For kyphoplasty, ODI scores improved from 60% to 32% in one cohort¹.

While functional outcomes were positive, the lack of standardized evaluation tools made pooled analysis difficult¹.

Cement Leakage and Procedural Complications

One of the most important differentiators between kyphoplasty and vertebroplasty is the rate of cement leakage:

• 41% of vertebroplasty cases experienced cement leakage
• 9% of kyphoplasty cases experienced leakage¹

Though most leaks were asymptomatic, serious complications included:

• Pulmonary embolism: 0.6% in vertebroplasty vs 0.01% in kyphoplasty
• Neurologic complications: 0.6% vs 0.03%, respectively¹

Importantly, intradiscal cement leaks were associated with a five-fold increase in adjacent vertebral fractures during follow-up (58% vs 12%)¹. Despite its lower leakage rate, kyphoplasty is not without risk; rare cases of paraplegia and cardiac events were noted in both procedures¹.

Vertebral Height Restoration and Kyphotic Correction

A key theoretical advantage of kyphoplasty is its ability to restore vertebral height and reduce kyphotic deformity. According to the review:

• Mean kyphotic angle correction was 6.6° for both procedures¹.
• However, kyphoplasty more consistently achieved vertebral height restoration, especially in fractures with mobility or intravertebral clefts¹.

Despite this, not all patients benefit:

• 34% of kyphoplasty cases and
• 39% of vertebroplasty cases failed to show any significant height or angle correction¹.

Vertebroplasty relies on patient positioning to achieve any restoration, while kyphoplasty uses mechanical expansion (balloon tamp)¹.

Risk of New Adjacent Fractures

New vertebral fractures, particularly adjacent to treated segments, are a shared complication:

• 60% of new fractures post-vertebroplasty occurred at adjacent levels
• 66% of new fractures post-kyphoplasty were also adjacent¹

Although the absolute rate of new fractures may exceed that of untreated osteoporotic patients, the review could not definitively determine whether augmentation increases this risk beyond the natural history of osteoporosis¹.

One study cited in the review reported that adjacent-level fractures were more common when intradiscal cement leakage occurred, suggesting biomechanical disruption may play a role¹.

Summary: Choosing the Right Technique

While both techniques are effective in relieving pain and improving function, kyphoplasty appears to offer advantages in height restoration and a significantly lower rate of cement leakage. However, the lack of randomized controlled trials means these findings must be interpreted with caution.

Kyphoplasty and vertebroplasty are both valuable tools in the treatment of painful osteoporotic compression fractures. Their use should be tailored to patient-specific factors, including fracture mobility, severity of kyphosis, and surgical risk. Surgeons must also weigh the risks of cement leakage and adjacent fractures when selecting the appropriate intervention.

At GS Medical, we support spine surgeons with precision-engineered kyphoplasty and vertebroplasty systems. Our next-generation Tracker™ Plus Kyphoplasty System is designed to help minimize cement leakage risk and support vertebral body restoration. Explore our solutions or consult with our team at www.gsmedicalusa.com

References

1. Hulme PA, Krebs J, Ferguson SJ, Berlemann U. Vertebroplasty and kyphoplasty: a systematic review of 69 clinical studies. Spine (Phila Pa 1976). 2006;31(17):1983-2001. doi:10.1097/01.brs.0000229254.89952.6b