The Biomechanics of the Transpedicular Endoscopic Approach

Author:

Meisterhans Michel1,Hagel Vincent23,Spirig José M.2,Fasser Marie-Rosa45,Farshad Mazda12,Widmer Jonas45

Affiliation:

1. Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland

2. University Spine Center Zurich, Balgrist University Hospital, University of Zurich, Zurich, Switzerland

3. Spine Center, Asklepios Klinik Lindau, Lindau, Germany

4. Institute of Biomechanics, Balgrist Campus, ETH Zurich, Zurich, Switzerland

5. Spine Biomechanics, Department of Orthopedic Surgery, Balgrist University Hospital, University of Zurich, Zurich, Switzerland

Abstract

Study Design. Biomechanical cadaveric study. Objective. The goal of this study was to analyze the effects of an endoscopic transpedicular approach with different drill diameters (6 and 8 mm) to compare them with the intact native side. In addition, the influence of bone quality on the resistance of the pedicle was investigated. Summary of Background Data. Clinical studies have repeatedly highlighted the benefits of endoscopic transpedicular decompression for down-migrated lumbar disc herniations. However, the biomechanical effects on pedicle stability have not been studied up to now. Methods. Twenty-four vertebras originating from four fresh-frozen cadavers were tested under uniaxial compression load in a ramp-to-failure test: (1) the tunneled pedicle on one side, and (2) the native pedicle on the other side. Twelve lumbar vertebrae were assigned to a drill diameter of 6 mm and the other 12 to a diameter of 8 mm. Results. The median ratio of sustained force for the operated side compared to the intact contralateral side is equal to 74% (63–88) for both drill diameters combined. An 8 mm transpedicular approach recorded an axial resistance of 77% (60–88) compared to the intact contralateral side (P=0.002). A 6 mm approach resulted in an axial resistance of 72% (66–84) compared to the intact opposite side (P=0.01). No significant difference between the two different drill diameters was recorded (P=1). For all 3 subgroups (intact, 8 mm, 6 mm) the HU-values and the absolute resistance force showed significant correlations (intact: ρ=0.859; P<0.001; 8 mm: ρ=0.902; P<0.001; 6 mm: ρ=0.835; P<0.001). Conclusion. Transpedicular approach significantly reduces the axial resistance force of the pedicle, which may lead to pedicle fracture. Bone quality correlated positively with the absolute resistance force of the pedicle, whereas the influence of the drill hole diameter plays only a limited role.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Neurology (clinical),Orthopedics and Sports Medicine

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