TITLE:
Interspinous Process Implants Causes Wear of the Spinous Processes in Patients Treated for Spinal Stenosis—An Experimental Biomechanical Study with Comparison to Clinical Cases
AUTHORS:
Adad Baranto, Christian Hagelberg, Jonas Hvannberg, Lars Ekström, Klas Halldin, Helena Brisby
KEYWORDS:
Porcine, Interspinous Process Device, Cyclic Loading, Wear, Degenerative Lumbar Spinal Canal Stenos, Aperius PercLID
JOURNAL NAME:
Open Journal of Orthopedics,
Vol.6 No.7,
July
14,
2016
ABSTRACT: There are few biomechanical studies on
Interspinous Process Implants (IPD); however none investigate the
amount of wear on spinous processes. Therefore the objective of the present
study was to investigate the effect of repetitive loading of the IPD Aperius on
the spinous processes in a biomechanical porcine model. For comparison, three
patients treated surgically with the same device have been followed for one to
two years clinically and with image analyses (X-rays, MRI, CT-scans). Four
lumbar spines from 6 months old porcine were divided into seven segments, which
received IPD. The segments were exposed to 20,000 cyclical loads. Afterwards
the deformation (wear) of the segments was registered. The wear of the spinous
processes was measured in mm on a following CT-scan. Additionally, the wear of
the ex-vivo was compared to that of
the spinous processes investigated by CT-scans or X-ray in three patients treated
surgically with the same interspinous implant. The mean maximal deformation of
porcine specimens was 1.79 mm (SD 0.25) with the largest deformation occurring
in the first quarter of the loading (