Biomechanical performance of the new BeadEx implant in the treatment of osteoporotic vertebral body compression fractures: Restoration and maintenance of height and stability

Vertebral compression fractures are counted among the most common complications of osteoporosis. For treatment, a new, alternative implant has been developed (BeadEx, Expandis, Hof HaCarmel, Israel). The aim of the present in vitro study was to evaluate whether this implant is able to restore the in...

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Bibliographic Details
Published in:Clinical biomechanics (Bristol) 2006-08, Vol.21 (7), p.676-682
Main Authors: Kettler, A., Schmoelz, W., Shezifi, Y., Ohana, N., Ben-Arye, A., Claes, L., Wilke, H.-J.
Format: Article
Language:English
Subjects:
Biomechanical Phenomena - methods
Biomechanics
Bone Plates
Bone Screws
Cadaver
Cyclic loading
Equipment Failure Analysis
Fracture
Fractures, Compression - etiology
Fractures, Compression - physiopathology
Fractures, Compression - surgery
Fractures, Spontaneous - etiology
Fractures, Spontaneous - physiopathology
Fractures, Spontaneous - surgery
Humans
In Vitro Techniques
Joint Instability - etiology
Joint Instability - physiopathology
Joint Instability - prevention & control
Joint Prosthesis
Lumbar Vertebrae - physiopathology
Lumbar Vertebrae - surgery
Osteoporosis - complications
Osteoporosis - physiopathology
Osteoporosis - surgery
Prosthesis Design
Range of Motion, Articular
Recovery of Function
Spinal Fractures - complications
Spinal Fractures - physiopathology
Spinal Fractures - surgery
Spinal Fusion - instrumentation
Spinal Fusion - methods
Spine
Surgical treatment
Thoracic Vertebrae - physiopathology
Thoracic Vertebrae - surgery
Treatment Outcome
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Summary:Vertebral compression fractures are counted among the most common complications of osteoporosis. For treatment, a new, alternative implant has been developed (BeadEx, Expandis, Hof HaCarmel, Israel). The aim of the present in vitro study was to evaluate whether this implant is able to restore the initial height and three-dimensional stability after fracture and whether it is able to maintain this height and stability during complex cyclic loading. The BeadEx implant consists of small titanium rolls, which are pressed into the vertebral body through specially designed, hollow pedicle screws. The height and the three-dimensional flexibility of 18 bisegmental spine specimens (nine T12–L2, nine L3–L5) was measured, first, before and after creating a wedge compression fracture at the middle vertebral body (L1 resp. L4), second, after treatment of the fracture, and, third, during and after complex cyclic loading. The fractures were treated either with BeadEx plus internal fixator, BeadEx plus bone cement or vertebroplasty for comparison. The height before fracture could almost be restored by BeadEx plus bone cement but not by BeadEx plus fixator and vertebroplasty. The total height loss after cyclic loading was smallest with BeadEx plus bone cement (in median −4.7 mm with respect to the intact specimens) but −6.2 mm with BeadEx plus fixator and −7.8 mm with vertebroplasty. The three-dimensional stability of the specimens was clearly higher if treated with BeadEx plus fixator than with BeadEx plus bone cement or vertebroplasty. From a biomechanical point of view, BeadEx plus bone cement can be recommended as an alternative to vertebroplasty in the treatment of osteoporotic vertebral body fractures. BeadEx plus fixator can be recommended if additional stability is needed.
ISSN:0268-0033
1879-1271
DOI:10.1016/j.clinbiomech.2006.02.005