Femoral Neck System FNS

Dynamic Stability for Neck of Femur Fractures

An integrated implant solution for unstable femoral neck fractures, combining an anti-rotational blade, dynamic compression screw, and locking plate in one streamlined system. Delivers active impaction, controlled collapse, and multiplanar rigidity through subchondral support.

Key Highlights:
✓ Anti-Rotation Blade: 5.8mm titanium implant secures superior head fragment (90%↑ torsional stiffness)
✓ Dynamic Sliding Core: Adjustable 25–55mm lag screw enables controlled fracture settlement (≤3.5mm)
✓ Anatomic Locking Plate: Precontoured to lateral femur; 3–5 locking holes → ↑ distal fixation
✓ Minimized Invasiveness: Single-incision insertion with integrated instrumentation
✓ Material Integrity: Ti-6Al-4V alloy (ASTM F136) for fatigue resistance >500,000 cycles

Target Indications:

Pauwels III vertical femoral neck fractures
Basicervical & comminuted transcervical fractures
Nonunion/implant revision cases
Intertrochanteric fracture extensions

Reinvent femoral neck fixation – three essential functions, one predictable outcome.

Femoral Neck System Components

Bolt: Provides angular stability by fixing securely to the plate.
Plate (with Locking Screw): Offers angular stability and a platform for secure fixation.
Antirotation Screw (ARScrew): Provides rotational stability and prevents the femoral head from rotating.
Optional Protection Sleeve: Facilitates the insertion of the ARScrew.
Special Instrument Set for FNS

No.	Description	Specification	Material
1	FNS Locking plate	1 hole	Titanium Alloy
2	FNS Locking plate	2 holes	Titanium Alloy
3	Antirotation Screw	6.5x80mm	Titanium Alloy
4	Antirotation Screw	6.5x85mm	Titanium Alloy
5	Antirotation Screw	6.5x90mm	Titanium Alloy
6	Antirotation Screw	6.5x95mm	Titanium Alloy
7	Antirotation Screw	6.5x100mm	Titanium Alloy
8	Antirotation Screw	6.5x105mm	Titanium Alloy
9	Antirotation Screw	6.5x110mm	Titanium Alloy
10	Antirotation Screw	6.5x115mm	Titanium Alloy
11	Bolt	10x80mm	Titanium Alloy
12	Bolt	10x85mm	Titanium Alloy
13	Bolt	10x90mm	Titanium Alloy
14	Bolt	10x95mm	Titanium Alloy
15	Bolt	10x100mm	Titanium Alloy
16	Bolt	10x105mm	Titanium Alloy
17	Bolt	10x110mm	Titanium Alloy
18	Bolt	10x115mm	Titanium Alloy
19	Locking screw	5.0x26mm	Titanium Alloy
20	Locking screw	5.0x28mm	Titanium Alloy
21	Locking screw	5.0x30mm	Titanium Alloy
22	Locking screw	5.0x32mm	Titanium Alloy
23	Locking screw	5.0x34mm	Titanium Alloy
24	Locking screw	5.0x36mm	Titanium Alloy
25	Locking screw	5.0x38mm	Titanium Alloy
26	Locking screw	5.0x40mm	Titanium Alloy
27	Locking screw	5.0x42mm	Titanium Alloy
28	Locking screw	5.0x44mm	Titanium Alloy
29	Locking screw	5.0x46mm	Titanium Alloy
30	Locking screw	5.0x48mm	Titanium Alloy
31	Locking screw	5.0x50mm	Titanium Alloy
32	Locking screw	5.0x52mm	Titanium Alloy
33	Locking screw	5.0x54mm	Titanium Alloy
34	Locking screw	5.0x56mm	Titanium Alloy
35	Locking screw	5.0x58mm	Titanium Alloy
36	Locking screw	5.0x60mm	Titanium Alloy

The Femoral Neck System: A Solution for Fractured Hips

The Femoral Neck System (FNS) is a medical device designed to provide enhanced fixation for femoral neck fractures in adults and adolescents with fused growth plates.

Advancing Femoral Neck Fracture Care

The Femoral Neck System (FNS) represents a significant evolution in the internal fixation of femoral neck fractures. Designed to address the biomechanical challenges and clinical shortcomings of traditional methods (like cannulated screws or dynamic hip screws), the FNS offers a streamlined, integrated solution centered on:

Optimized Biomechanics: Combines a sliding lag screw mechanism for controlled compression with a dedicated anti-rotational implant (typically an integrated derotation screw or blade) within a single, low-profile implant.
Intramedullary Stabilization: A distal locking mechanism engaging the femoral shaft enhances stability, particularly valuable in unstable fracture patterns or osteoporotic bone.
Minimized Soft Tissue Disruption: Utilizes a minimally invasive approach with guidewire precision and a single insertion point.
Adaptability: Designed to accommodate a spectrum of femoral neck fracture types, from non-displaced Garden I/II to more complex displaced patterns (Garden III/IV), and suitable for younger patients with high functional demands as well as elderly patients seeking stable fixation for early mobilization.
Efficiency: Standardized instrumentation promotes procedural predictability and efficiency.

The FNS aims to improve outcomes by providing superior rotational control, reliable interfragmentary compression, and enhanced overall stability compared to historical options.

Indications

The Femoral Neck System (FNS) is indicated for the internal fixation of femoral neck fractures in skeletally mature patients:

Fresh Fractures:
- Non-displaced (Garden I & II) femoral neck fractures.
- Displaced (Garden III & IV) femoral neck fractures requiring anatomical reduction and stable internal fixation.
- Basicervical femoral neck fractures.
Revision Surgery: Stabilization of failed previous fixation of femoral neck fractures (e.g., screw cut-out).
Non-unions & Malunions: Selected cases requiring revision fixation and compression.
Pathological Fractures: Stabilization of impending or actual pathological fractures within the femoral neck region, when definitive management is appropriate.
Osteopenic/Osteoporotic Bone: Specifically designed features (distal locking, anti-rotation) enhance stability in compromised bone quality.

Contraindications

Use of the FNS requires careful patient selection and assessment of risks:

Active Local or Systemic Infection: Risk of implant-associated infection.
Skeletal Immaturity: The system is not intended for patients with open growth plates.
Severe Vascular or Neurological Insufficiency in the Limb: Contraindicates elective surgery in the area.
Severe Bone Loss or Inadequate Bone Stock: Where secure fixation cannot be achieved proximally (femoral head/neck) or distally (femoral shaft).
Allergy to Implant Materials: Hypersensitivity to titanium alloy or other components.
Non-compliant Patient: Patients unable or unwilling to follow post-operative weight-bearing restrictions and rehabilitation protocols.
Lack of Surgical Expertise: Requires specific training in minimally invasive techniques, fracture reduction, and the FNS instrumentation.

The final decision to use the FNS must be based on the surgeon’s evaluation of the specific fracture pattern, patient factors, and suitability compared to other treatment options.

Surgical Technique

The FNS utilizes a minimally invasive technique facilitated by specialized instrumentation:

1.Preoperative Planning

- Detailed review of AP/Lateral hip radiographs and potential CT scans.
- Template implant sizing based on anatomy and fracture geometry.
- Identify optimal entry point and trajectory.

2.Patient Positioning

Supine position on a fracture table or radiolucent operating table; traction applied for reduction. Ensure unimpeded fluoroscopic access (AP, Lateral, and true lateral views essential).

3.Fracture Reduction

Obtain anatomical reduction under fluoroscopic guidance (critical for successful fixation). Closed reduction attempted first; open reduction via small anterior approach if necessary.

4.Guidewire Insertion & Entry Point

Key Landmark: Entry point typically slightly lateral to the piriformis fossa or in the greater trochanter tip region (system dependent).
Insert K-wire under fluoroscopy confirming optimal position centrally within the femoral neck and head on both AP and true lateral views.

FNS Assembly & Insertion

Measure depth using graduated sleeves over the guidewire.
Prepare the proximal femur (drill/ream specific channels as per system design).
Assemble the FNS implant (lag screw, anti-rotation component, plate/barrel section) onto the inserter.
Insert the assembled FNS device over the primary guidewire to the pre-measured depth.
Confirm optimal implant position fluoroscopically (tip-apex distance critical for lag screw).

Distal Fixation & Locking

Affix the distal plate/barrel segment to the lateral femoral cortex.
Insert distal locking screws (usually one or two) through a targeting guide.

Compression & Final Locking

Apply controlled compression across the fracture site via the inserter.
Final tightening of the lag screw locking mechanism within the barrel to prevent screw disengagement.
Final tightening of the anti-rotation implant locking mechanism.

Final Check & Closure

Confirm fracture reduction, implant position, and stability under full dynamic fluoroscopy.
Remove guidewires and inserter.
Close incisions in layers.

Post-operative Management

Immediate protected weight-bearing status defined by fracture stability and surgeon protocol.
Standard wound care.
Rehabilitation focused on regaining hip range of motion and strength.
Regular follow-up with radiographs to monitor union and implant position.

Important:* Surgeons must undergo specific procedural training on the particular FNS system being used and consult the manufacturer’s detailed Instructions for Use (IFU) for exact steps, warnings, and instrumentation details.*

Disclaimer: The information provided herein is a general overview for qualified healthcare professionals. It is not a substitute for the manufacturer’s official Instructions for Use (IFU), specific surgical training, or the surgeon’s independent clinical judgment. Product specifications, indications, contraindications, warnings, precautions, and detailed surgical techniques vary by specific FNS system and manufacturer. Always refer to the validated IFU and surgical technique guides for the exact product being used prior to any procedure. Off-label use carries inherent risks and must be carefully considered.

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