Jonas Widmer
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Biomechanical effects of incremental resection of the lumbar superior articular process using an endoscopic approach Open
Purpose This study aimed to evaluate the biomechanical effects of progressively removing parts of the facet joint (mainly the superior articular process (SAP)) in cadaveric models via the typical endoscopic posterolateral route. Materials …
Bone density-optimized pedicle screw planning enhances mechanical stability Open
Purpose This study aimed to evaluate whether bone density-optimized (BDO) pedicle screw trajectories improve screw stability compared to standard trajectories in spinal fusion surgery. The central research question was whether preoperative…
Intra-, Epidural And Intracranial Pressure Changes During Interlaminar Endoscopy, With and Without Dural Tear Open
Objective: Endoscopic spine surgery implies possibly severe complications of the central nervous system, from headache to seizures and autonomic dysreflexia. These adverse events might be due to increased intracranial pressure (ICP), presu…
Quantifying in vitro load-sharing in spinal fusion surgical constructs using strain sensor-equipped fixation rods and force sensor-equipped intervertebral cages Open
The findings demonstrate that anatomical structures play a critical role in load-sharing during spinal fusion, consistently carrying more than 40% of the load, while cages contribute synergistically by maintaining intervertebral height and…
Impact of spinal alignment on adjacent segment disease and degeneration after short-segment lumbosacral fusion Open
In this long-term follow-up study of patients undergoing short-segment lumbosacral fusion, neither preoperative nor postoperative SPA was significantly associated with the development of ASDis or ASDeg. These findings suggest that other fa…
The triadic relationship between spinal posture, loading, and degeneration Open
Introduction Degenerative changes in the lumbar spine may affect many structures, among them the intervertebral discs and the facet joints. The individual load distribution within the spine linked to posture and mass distribution is a prob…
Classification of endoscopic spine procedures Open
A consensus of 112 endoscopic spine surgeons from 27 countries facilitated the development of a 2-dimensional classification system outlining the complexity of endoscopic spinal procedures, taking into account both technical aspects and mo…
The effect of experimentally induced gluteal muscle weakness on joint kinematics, reaction forces, and dynamic balance performance during stair climbing Open
A weakness in the hip abductors severely affected stair climbing performance. Those who managed to complete the task demonstrated abnormal kinematics, reduced joint reaction forces, and poorer dynamic balance.
View article: Failure forces of different interspinous vertebropexy techniques
Failure forces of different interspinous vertebropexy techniques Open
This study proposes alternative vertebropexy techniques to enhance spinal stabilization and minimize failure risks.
Spinous process resistance to different materials and looping techniques for interspinous lumbar vertebropexy Open
Purpose Semi-rigid spinal stabilization has been explored as an alternative to spinal fusion, and early experience with spinal segment augementation (“vertebropexy”) is promising. The main technical challenge is to maintain the integrity o…
The importance of the posterior osteoligamentous complex of the lumbar spine: dogma changing biomechanical insights Open
Background During full flexion of the spine, the paraspinal muscles are largely inactive. This suggests that passive structures like the posterior osteoligamentous complex (POLC), consisting of interspinous and supraspinous ligaments and t…
Anatomical landmark detection on bi-planar radiographs for predicting spinopelvic parameters Open
Introduction Accurate landmark detection is essential for precise analysis of anatomical structures, supporting diagnosis, treatment planning, and monitoring in patients with spinal deformities. Conventional methods rely on laborious landm…
Feasibility of an Inductive Pedicle Screw Loosening Detection Concept Using a Pulse Induction Metal Detector Open
Introduction: Pedicle screw loosening is a major problem in spine surgery. Computed tomography (CT) is the gold standard to diagnose screw loosening. Disadvantages of CT include low sensitivity and specificity for the detection of loosened…
An Experimental Model for Fluid Dynamics and Pressures During Endoscopic Lumbar Discectomy Open
Objective: Endoscopic spine surgery is an emerging technique of minimally invasive spine surgery. However, headache, seizure, and autonomic dysreflexia are possible irrigation-related complications following full-endoscopic lumbar discecto…
The Biomechanics of the Transpedicular Endoscopic Approach Open
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) and compare them with the intact native side. In…
Load distribution on intervertebral cages with and without posterior instrumentation Open
Cage instrumentation allows some of the compression force to be transmitted through the cage to the screws below, better distributing and reducing the overall force on the pedicle screws at the end of the construct and on the rods.
Bone density optimized pedicle screw insertion Open
Background: Spinal fusion is the most common surgical treatment for the management of degenerative spinal disease. However, complications such as screw loosening lead to painful pseudoarthrosis, and are a common reason for revision. Optimi…
Lumbar vertebropexy after unilateral total facetectomy Open
Lumbar vertebropexy seems promising to counteract the destabilizating effect of facetectomy by targeted stabilization.
Interspinous and spinolaminar synthetic vertebropexy of the lumbar spine Open
Purpose To develop and test synthetic vertebral stabilization techniques (“vertebropexy”) that can be used after decompression surgery and furthermore to compare them with a standard dorsal fusion procedure. Methods Twelve spinal segments …
Vertebropexy as a semi-rigid ligamentous alternative to lumbar spinal fusion Open
Purpose To develop ligamentous vertebral stabilization techniques (“vertebropexy”) that can be used after microsurgical decompression (intact posterior structures) and midline decompression (removed posterior structures) and to elaborate t…