title: Prophylactic vertebroplasty can decrease the fracture risk of adjacent vertebrae: an in vitro cadaveric study.
abstract: Adjacent level vertebral fractures are common in patients with osteoporotic wedge fractures, but can theoretically be prevented with prophylactic vertebroplasty. Previous tests on prophylactic vertebroplasties have been performed under axial loading, while in vivo changes in spinal alignment likely cause off-axis loads. In this study we determined whether prophylactic vertebroplasty can also reduce the fracture risk under off-axis loads. In a previous study, we tested vertebral bodies that were loaded axially or 20° off-axis representing vertebrae in an unfractured spine or vertebrae adjacent to a wedge fracture, respectively. In the current study, vertebral failure load and stiffness of our previously tested vertebral bodies were compared to those of a new group of vertebral bodies that were filled with bone cement and then loaded 20° off-axis. These vertebral bodies represented adjacent-level vertebrae with prophylactic bone cement filling. Prophylactic augmentation resulted in failure loads that were comparable to those of the 0° group, and 32% greater than the failure loads of the 20° group. The stiffness of the prophylacticly augmented vertebrae was 21% lower than that of the 0° group, but 27% higher than that of the 20° group. We conclude that prophylactic augmentation can decrease the fracture risk in a malaligned, osteoporotic vertebra. Whether this is enough to actually prevent additional vertebral fractures in vivo remains subject of further study.
authors.affiliation: Radboud University Medical Center, Orthopaedic Research Laboratory, Department of Orthopaedics, The Netherlands.
authors.forename: René
authors.initials: R
authors.lastname: Aquarius
authors.affiliation: University of Twente, Laboratory for Biomechanical Engineering, The Netherlands. Electronic address: J.Homminga@utwente.nl.
authors.forename: Jasper
authors.initials: J
authors.lastname: Homminga
authors.affiliation: Radboud University Medical Center, Spine Unit, Department of Orthopaedics, The Netherlands.
authors.forename: Allard Jan Frederik
authors.initials: AJ
authors.lastname: Hosman
authors.affiliation: Radboud University Medical Center, Orthopaedic Research Laboratory, Department of Orthopaedics, The Netherlands; University of Twente, Laboratory for Biomechanical Engineering, The Netherlands.
authors.forename: Nico
authors.initials: N
authors.lastname: Verdonschot
authors.affiliation: Radboud University Medical Center, Orthopaedic Research Laboratory, Department of Orthopaedics, The Netherlands.
authors.forename: Esther
authors.initials: E
authors.lastname: Tanck
mesh_terms: D000369:Aged, 80 and over; D002102:Cadaver; D019245:Compressive Strength; D055119:Elastic Modulus; D005260:Female; D050815:Fractures, Compression / Q000503:physiopathology* / Q000517:prevention & control*; D006801:Humans; D008297:Male; D065286:Prophylactic Surgical Procedures / Q000379:methods*; D012008:Recurrence; D018570:Risk Assessment; D016103:Spinal Fractures / Q000503:physiopathology* / Q000517:prevention & control*; D013314:Stress, Mechanical; D016896:Treatment Outcome; D054854:Vertebroplasty / Q000379:methods*; D016474:Weight-Bearing
keywords: Biomechanics; Osteoporosis; Percutaneous vertebroplasty; Prophylactic vertebroplasty; Spine; Vertebral fractures