Polyaxial Pedicle Screw

Polyaxial Pedicle Screw Overview

Polyaxial Pedicle Screw Features and Benefits

Polyaxial ball-head design allows multi-axis movement for optimal rod alignment

Multiple diameters and lengths: 3.5 to 7.5 mm; 35–60 mm lengths to match anatomic variability

Titanium alloy (Ti‑6Al‑4V) for corrosion resistance and fatigue durability

High insertion efficiency via dual-lead or tapered threading

Color-coded packaging streamlines intraoperative selection

Compatible with various rods (5.5 mm or 6.0 mm options) and crosslink connectors

Low-profile tulip head minimizes soft tissue irritation

Polyaxial Pedicle Screw Indications

Used for posterior spinal stabilization in adult patients across:

Degenerative conditions (spondylolisthesis, stenosis, DDD)

Trauma (vertebral fractures, dislocations)

Spinal deformities (scoliosis, kyphosis)

Failed fusion cases or pseudoarthrosis

Long-construct fixation (e.g. ≥ three levels)

Both open and minimally invasive surgical approaches

Polyaxial Pedicle Screw Specifications

Actual Pictures of Polyaxial Pedicle Screw

Polyaxial Pedicle Screw Insights

What is the Polyaxial Pedicle Screw?

A polyaxial screw features a separate, spherical head that rotates relative to the screw shank. This flexible articulation allows rods to seat from variable trajectories, minimizing soft tissue disruption and facilitating deformity or MIS constructs. The design also tends to fail at the screw-head interface before causing catastrophic shaft fracture, offering a safety margin in extreme loading scenarios.

Applications of Polyaxial Pedicle Screw

The Polyaxial Pedicle Screw is indicated for use in:

Posterior fixation in thoracolumbar instrumentation (degenerative, trauma, deformity, revision)

Cases requiring rod alignment flexibility across complex spinal anatomy

Minimally invasive (MIS) implant placement where trajectory may vary per screw level

Multi-level constructs where polyaxial heads simplify rod passage and seating

Advantages of Polyaxial Pedicle Screw

Greater head articulation (>60°) eases rod insertion and reduces stress at bone-implant interface

Color-coded sizes and dual-lead threading increase operative speed and usability

Titanium alloy ensures high fatigue resistance and minimal MRI/CT artifact

Compatible with standard reduction tools and connectors for construct expansion

Reduces mechanical stress transfer compared to monoaxial designs under load

Biomechanics of Polyaxial Pedicle Screw

Pull-out strength is largely determined by screw diameter and surrounding bone quality; larger outer diameter and smaller inner core diameter improve fixation integrity.

Insertion technique: under-tapping (pilot hole slightly smaller than screw diameter) preserves pull-out strength better than same-size tapping.

Fatigue resistance: inner diameter impacts screw neck fracture—polyaxial heads distribute stress differently than monoaxial screws.

Polyaxial joints may act as mechanical buffers, allowing controlled failure at the head to protect the shank.

Surgical Technique of Polyaxial Pedicle Screw

Preoperative planning with CT to select appropriate screw diameter and length

Use awl or pedicle probe to prepare entry, then drill pilot hole using trajectory guide

Tap or undertap per protocol; insert screw and seat desired polyaxial head orientation

Insert rods through tulip head; use reduction tools if needed to seat rod

Final set screw locking using torque-limited drivers to avoid over-tightening

Confirm alignment with fluoroscopy; secure crosslinks/connectors if required

Monitor for any unusual resistance during insertion to avoid bone stripping

Postoperative Care of Polyaxial Pedicle Screw

Following implantation, proper postoperative care is essential to ensure healing and prevent complications:

Obtain immediate postoperative radiography or CT to evaluate screw placement and alignment

Advise limiting twisting or heavy axial loads for initial 6–12 weeks post-fusion

Begin rehabilitative protocols emphasizing paraspinal and core muscle strengthening

Periodic imaging at 3‑, 6‑, and 12‑month intervals to detect fusion progress and hardware stability

Titanium's imaging compatibility supports postoperative assessments with minimal artifact

Conclusion

The Polyaxial Pedicle Screw delivers reliable mechanical fixation combined with intraoperative flexibility. Its spherical head design, dual-thread geometry, and compatibility with a wide range of rod systems make it a foundational component in modern spinal instrumentation sets. Tested to international standards (CE, ISO), and engineered for durability and efficiency, it supports a variety of surgical approaches—open or minimally invasive—and clinical indications, from degenerative pathology to complex deformity correction.

FAQs of Polyaxial Pedicle Screw

What does 'polyaxial' mean in this screw?

The term refers to the ball-and-socket head that allows multi-plane movement relative to the screw shaft, enabling flexible rod alignment during insertion.

Does polyaxial articulation reduce strength?

No—the joint is engineered to withstand normal spinal loading, and failure (if it occurs) typically happens at the head interface rather than the screw shaft, preserving bone integrity.

Is fatigue strength compromised?

Fatigue strength depends more on inner core geometry than head articulation. Proper diameter selection and quality titanium alloy ensure long-term durability.

Should I tap pilot holes?

Undertapping by around 1 mm is recommended to maximize fixation strength while still facilitating smooth insertion. Avoid same-size tapping if possible.

Is this compatible with MIS systems?

Yes—polyaxial design and cannulated/shank options facilitate use in MIS constructs, working with minimally invasive instrumentation and guide systems.

Our Factory

Our factory is equipped with over 60 advanced CNC machines operated by 100+ skilled technicians, a 300 m² GMP-compliant clean room, and a 10,000 m² production facility. We maintain a CNAS and ISO 17025 certified testing center, invest heavily in CNC turning technology, and utilize high-precision inspection systems including CMM, PP, and QV to ensure product quality and consistency.

FAQs of Our Company and Factory - Polyaxial Pedicle Screw

What is your typical delivery time?

We offer fast and reliable global shipping. Standard lead times range from 7 to 15 working days, depending on order quantity and customization requirements. Express delivery options are also available upon request.

Do you ship internationally?

Yes, we ship to most countries worldwide. We work with trusted logistics partners to ensure timely and secure delivery.

What payment methods do you accept?

We accept a variety of payment options, including T/T (bank transfer), L/C, and PayPal for smaller orders. Payment terms can be discussed based on order volume and partnership agreements.

Can I get samples before placing a bulk order?

Yes, samples are available for evaluation. Please contact our sales team to request product samples and shipping arrangements.

Do you support OEM or custom manufacturing?

Absolutely. We offer OEM/ODM services including custom packaging, branding, and product development tailored to your specifications.