POLY AXIAL SCREW (HA COATED)
Polyaxial screws, like their monoaxial counterparts, are important orthopedic implants used in various surgical procedures. Here's the breakdown of their specifications and uses:
Size
- Diameters: 4.5mm, 5mm, 5.5mm, 6.5mm and 7.5mm.
- Lengths: 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm and 60mm
Specification
- Material: Polyaxial screws are typically made from medical-grade titanium or titanium alloy, similar to monoaxial screws. This material provides excellent biocompatibility and mechanical strength necessary for implantation in bone tissue.
- Design: Unlike monoaxial screws, polyaxial screws feature a head that can articulate or move relative to the screw shaft in multiple directions. This design allows for greater flexibility in screw placement and alignment during surgery.
- Thread: Similar to monoaxial screws, polyaxial screws have a threaded shaft for fixation into bone tissue. The threads provide stability and grip, ensuring the screw remains securely anchored in place.
- Coating: Polyaxial screws may also be coated with hydroxyapatite (HA) to enhance osseointegration and promote bone healing around the implant. The HA coating facilitates the formation of a strong bond between the implant and surrounding bone tissue.
- Size: Like monoaxial screws, polyaxial screws come in various lengths and diameters to accommodate different patient anatomies and surgical requirements.
- Sterilization: Polyaxial screws undergo sterilization using methods such as gamma irradiation or ethylene oxide to ensure they are free from any microbial contamination before surgical use.
Uses
- Spinal Fusion Surgery: Polyaxial screws are commonly used in spinal fusion procedures to stabilize and fuse vertebral segments. The polyaxial design allows for greater freedom of screw angulation, enabling surgeons to achieve optimal screw placement and alignment for improved stability and fusion success.
- Degenerative Spine Conditions: These screws may be utilized in the treatment of degenerative spine conditions such as degenerative disc disease or spondylolisthesis. By stabilizing the affected spinal segments, polyaxial screws help alleviate pain and restore spinal function.
- Trauma Surgery: Polyaxial screws can also be employed in the fixation of traumatic fractures, particularly in complex fractures or those involving multiple fragments. The polyaxial head design facilitates easier screw placement in challenging anatomical locations, enhancing surgical precision and efficacy.
- Revision Surgery: In cases where previous spinal instrumentation requires revision or augmentation, polyaxial screws may be used to provide additional stability and support. The polyaxial head allows for greater flexibility in connecting rods or other spinal implants, accommodating variations in spinal anatomy and hardware placement.
- Pedicle Screw Fixation: Polyaxial pedicle screws are commonly used in spinal instrumentation systems for posterior spinal fixation. Their polyaxial design enables surgeons to navigate the complex anatomy of the spine and achieve optimal screw placement within the pedicle for superior biomechanical stability.
Polyaxial screws are valuable tools in orthopedic and spinal surgery, offering versatility, reliability, and enhanced surgical outcomes when used appropriately by trained medical professionals.