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An ex vivo biomechanical comparison of a novel vertebral compression fracture treatment system to kyphoplasty
- Source :
- Clinical Biomechanics. 27:346-353
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- Vertebral compression fracture repair aims to relieve pain and improve function by restoring vertebral structure and biomechanics, but is still associated with risks arising from polymethylmethacrylate cement extravasation. The Kiva® Vertebral Compression Fracture Treatment System, a stacked coil implant made of polyetheretherketone and delivered over a guide-wire, is a novel device designed to provide height restoration and mechanical stabilization, while improving cement containment and minimizing disruption of cancellous bone. The objective of this study was to determine whether the Kiva system is as effective as balloon kyphoplasty at restoring mechanical properties in osteoporotic vertebral compression fractures.Wedge fractures were created in the middle vertebra of fourteen osteoporotic three-vertebra spine segments and then repaired with either the Kiva or kyphoplasty procedure. Height, stiffness and displacement under compression of the spine segments were measured for four conditions: intact, fractured, augmented, and post-cyclic eccentric loading (50,000cycles, 200-500N, 30mm anterior lever arm).No significant differences were seen between the two procedures for height restoration, stiffness at high or low loads, or displacement under compression. However, the Kiva System required an average of 66% less cement than kyphoplasty to achieve these outcomes (mean 2.6 (SD 0.4) mL v. mean 7.5 (SD 0.8) mL 0; P0.01). Extravasations and excessive posterior cement flow were also significantly lower with Kiva (0/7 v. 4/7; P.05).Kiva exhibits similar biomechanical performance to balloon kyphoplasty, but may reduce the risk of extravasation through the containment mechanism of the implant design and by reducing cement volume.
- Subjects :
- medicine.medical_specialty
Compressive Strength
Biophysics
In Vitro Techniques
Prosthesis Design
Balloon
medicine.disease_cause
Models, Biological
Weight-bearing
Weight-Bearing
Fractures, Compression
Humans
Medicine
Computer Simulation
Kyphoplasty
Orthopedics and Sports Medicine
Orthodontics
business.industry
Vertebral compression fracture
Biomechanics
Stiffness
Prostheses and Implants
medicine.disease
Surgery
Vertebra
Equipment Failure Analysis
Treatment Outcome
medicine.anatomical_structure
Spinal Fractures
Implant
medicine.symptom
business
Cancellous bone
Subjects
Details
- ISSN :
- 02680033
- Volume :
- 27
- Database :
- OpenAIRE
- Journal :
- Clinical Biomechanics
- Accession number :
- edsair.doi.dedup.....7313691e575c8437576beda5ae325977