Bone Screw Placement
Bone Screw Placement - Related Videos
06:24
A Spine Robotic-Assisted Navigation System for Pedicle Screw Placement
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Cited by 8 •
2020
This article presents a standardized surgical technique for robotic-assisted pedicle screw placement by using robotic-assisted navigational systems. We present a step-by-step protocol and describe the workflow and precautions of this procedure.
06:18
Pedicle Screw Placement Using an Augmented Reality Head-Mounted Display in a Porcine Model
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2024
The augmented reality head-mounted display, Magic Leap, was used in combination with a conventional navigation system to place pedicle screws in a porcine model by adhering to a novel workflow. With a median insertion time of <2.5 min, submillimeter technical accuracy and 100% clinical accuracy were achieved according to Gertzbein.
09:51
Intraosseous Needle Placement
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2023
Source: Julianna Jung, MD, FACEP, Associate Professor of Emergency Medicine, The Johns Hopkins University School of Medicine, Maryland, USA For unstable patients requiring urgent administration of medications, fluids, or blood products, establishing vascular access quickly is essential. However, there are many factors that can complicate placement of a peripheral intravenous cannula (PIV), and it is extremely common for PIV attempts to fail. PIV placement may be technically challenging in small...
06:57
Arterial Line Placement
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2023
Source: Sharon Bord, MD, Department of Emergency Medicine, The Johns Hopkins University School of Medicine, Maryland, USA When monitoring patients, it is important to obtain values that are accurate and reliable. Blood pressure monitoring is one of the essential vital signs, and for a majority of patients, measuring it utilizing non-invasive techniques provides accurate values. However, there are situations in which the blood pressure requires more exact, specific, and reliable measurements.
01:16
Self-Locking Screw
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2023
A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability. A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed. This occurs when the frictional force direction reverses, and the reaction force acts on the other side of the...
FAQs
Trajectory accuracy is the main geometric control in bone screw placement. The selected path must direct the screw toward suitable bone for purchase while keeping the implant away from nearby nerves, blood vessels, and intracranial tissue. This balance matters because a mechanically useful trajectory can still create neurological risk if it places the screw or its path too close to sensitive structures.
Controlled torque provides feedback and restraint during advancement. Applying torque deliberately helps the screw obtain secure purchase without treating force as the only goal. The desired result is stable fixation, not simply deeper insertion. In neurosurgical hardware, this distinction is important because excessive or poorly controlled advancement may contribute to malposition or injury near protected neurological anatomy.
A pilot hole is used when needed to prepare the bone before screw advancement. Its role is procedural rather than universal: the operator first determines whether preparation is appropriate, then advances the selected screw along the planned trajectory. This step can support controlled insertion, but the source does not indicate that every cranial or neurosurgical fixation procedure requires one.
Screw choice must match the fixation task and surrounding anatomy. In bone screw placement, selection is linked to the intended implant and the need for secure purchase in bone, while trajectory planning accounts for nearby neural and vascular structures. This principle applies whether screws secure a cranial plate, a stereotactic frame, or another neurological implant.
A basic workflow begins with selecting the screw and planning its trajectory, followed by pilot-hole preparation when needed and controlled advancement with torque. The operator then relies on the resulting purchase and position to support stable hardware fixation. Each stage serves a separate purpose: compatibility, safe direction, bone preparation, and mechanical security.
In neurosurgery, bone screw placement supports cranial plates, fixation systems, stereotactic frames, and other implants. These uses share a need to hold hardware steadily while protecting neurological structures. The technique therefore contributes to both reconstruction and procedural stabilization: it can secure protective cranial hardware or maintain the position of systems used in neurological intervention.
Successful placement is judged by more than whether the screw remains in bone. Secure purchase and accurate position support mechanical stability and reliable healing, whereas loosening, malposition, or tissue injury represent important adverse outcomes. This makes placement accuracy clinically relevant because it links the technical steps to the durability and safety of neurological reconstruction or fixation.