|REF. NO. LENGTH
608.4520 20 mm
608.4522 22 mm
608.4524 24 mm
608.4526 26 mm
608.4528 28 mm
608.4530 30 mm
|REF. NO. LENGTH
608.4535 35 mm
608.4540 40 mm
608.4545 45 mm
608.4550 50 mm
608.4555 55 mm
608.4560 60 mm
|REF. NO. LENGTH
608.4565 65 mm
608.4570 70 mm
608.4575 75 mm
608.4580 80 mm
| Technical Specification
Thread Diameter 4.5 mm
Drill Bit for threaded Hole 2.5 mm
Core Diameter 2.4 mm
Hexagonal Socket 3.5 mm
Head Diameter 8.0 mm
Shaft Diameter 3.4 mm
4.5 mm Cancellous Bone Screw Short-Thread Specification
- 4.5 mm Cancellous Bone Screw Short-Thread available lengths are 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm and 80mm.
- 4.5 mm Cancellous Bone Screw Short-Thread is made from pure Titanium and SS 316L.
- Any additional length sizes of this screw will be made on demand.
- This is Self Tapping Screw. Self Tapping Screws cuts its own thread while being driven into the bone. It makes a small hole while entering the bone which creates a tight friction fit between the threads. This helps fight vibration loosening and allows the parts to be taken apart if needed.
- Instruments are available for this screw such as Bone Taps, Combined Drill & Tap Sleeve, Counter Sink, Depth Gauge, Drill Bits, Drill Guide, Drill Sleeve, Hollow Mill Screw Removal, Reverse Measuring Device, Screw Drivers and Screw Holding Forceps etc.
4.5 mm Cancellous Bone Screw Short-Thread uses
4.5 mm Cancellous Bone Screw Short-Thread is intended for fracture fixation of large bones and large bone fragments.
This Screw is also indicated for:
- Femoral neck fractures
- Slipped capital femoral epiphyses
- As an adjunct to DHS in basilar neck fractures
- Tibial plateau fractures
- Ankle arthrodeses
- Pediatric femoral neck fractures
- Intercondylar femur fractures
- Sacroiliac joint disruptions
- Subtalar arthrodeses
Bone screws are the most commonly used orthopedic implants. There are many different types and sizes of screws for different types of bones. Most bone screws are made out of stainless steel or titanium alloys. The outer diameter, root diameter, and thread pitch and angle are important in determining screw mechanics.
In orthopedics, screws are typically described by their outer diameter, for example, a “4.5 mm Cancellous Bone Screw Short-Thread” has an outside diameter of 4.5 mm. The pitch of a screw is the linear distance travelled by a screw for one full turn of the screw. The screw advances by a distance equal to the distance between the threads with each full turn. Cortical screws have a lower pitch and therefore more number of threads. Cancellous bone screws have a greater depth of the screw to increase the surface area and therefore improve the purchase, as the bone is weaker.
Screws function by converting the tightening torque into internal tension in the screw and elastic reactions in the surrounding bone. This creates compression between the fracture fragments that the screw is holding together. 4.5 mm Cancellous Screw Short-Thread is typically inserted into holes drilled equal to the root diameter and are either self-tapping or are inserted tapped (threaded) holes. The torque to insert cortical bone screws can be high, so the screws must be properly inserted into the correct size drilled hole and designed to withstand insertion torque levels expected in cortical bone. Cancellous bone screws have large, deep threads that grip the spongy bone well. Because of the relatively low strength of the cancellous bone, failure of the screw itself during insertion is rare, but pull out can be an issue.