Difference Between Kyphoplasty and Vertebroplasty
Kyphoplasty differs from vertebroplasty only by the use of a percutaneously delivered balloon that is inflated in the vertebral body before cement injection—it is essentially "balloon-assisted vertebroplasty." 1
Technical Distinction
The key procedural difference is straightforward:
- Vertebroplasty: Direct percutaneous injection of bone cement (PMMA) into the fractured vertebral body
- Kyphoplasty: Inflation of a balloon tamp in the vertebral body first, creating a cavity, followed by cement injection into that cavity 1
The balloon in kyphoplasty (FDA-approved KyphX Inflatable Bone Tamp) theoretically restores vertebral body height while creating a low-pressure cavity for cement placement 1.
Clinical Outcomes: Essentially Equivalent
Both procedures achieve the same benefit for patient pain relief, mobility improvement, and quality of life at similar complication rates 1. The evidence shows:
- Pain relief: No significant differences in mean pain scores postoperatively (2.9 for both) or at 12 months (2.7 vs 3.2, p=0.64) 2
- Disability: No significant differences postoperatively (34.7 vs 36.3, p=0.74) or at 12 months (28.3 vs 29.6, p=0.70) 2
- Quality of life: Both procedures show similar improvements across all domains 1
Anatomic and Safety Differences
Kyphoplasty demonstrates some technical advantages, though their clinical significance remains debatable:
- Vertebral height restoration: Kyphoplasty achieves significantly better height restoration (79% recovery after consolidation vs 47% for vertebroplasty, p<0.001) 3
- Kyphotic angle correction: Greater reduction in wedge deformity with kyphoplasty 2, 4
- Cement leakage: Significantly lower rates with kyphoplasty (11.4% vs 31%, p<0.001) 4. The balloon creates a compacted cavity allowing more viscous cement at lower pressure 5
- Adjacent fractures: Trend toward fewer new fractures with kyphoplasty, though not statistically significant 2
Practical Considerations
The major drawback of kyphoplasty is cost—approximately 2.5 times more expensive than vertebroplasty due to additional equipment, anesthesia, and hospital costs 1. Procedure duration is also longer (40.0 vs 31.8 minutes, p<0.001) 6.
Clinical Decision-Making
Given equivalent pain relief and functional outcomes at similar complication rates, the multisociety consensus position is that kyphoplasty should be considered an alternative procedure to vertebroplasty, with choice based on operator experience or preference 1, 7.
Certain clinical scenarios may favor one approach:
- Severe vertebral wedge fractures with significant height loss may benefit more from kyphoplasty's superior height restoration 3
- Degree of compression deformity, fracture age, and neoplastic involvement may influence selection 1
- However, these subgroup benefits remain undefined and unproven 1
Important Caveat
With the considerable added financial expense of kyphoplasty, a substantial clinical benefit over vertebroplasty would have to be proved to justify this cost 1. To date, no prospective randomized studies have convincingly demonstrated such benefit in terms of the outcomes that matter most—pain relief, mobility, and quality of life 1.
Both procedures carry similar major complication rates: <1% for osteoporotic fractures and <5% for neoplastic involvement 5.