PS Femoral Insert

PS Femoral Insert Overview

PS Femoral Insert Features and Benefits

·Central Stabilizing Post

Features a precision-machined central post that acts as a mechanical pivot against the femoral cam, preventing anterior translation of the tibia and stabilizing the joint in deep flexion.

Highly Cross-linked Polyethylene (HXPE)

·Highly Cross-linked Polyethylene (HXPE)

Utilizes HXPE material technology to minimize volumetric wear and debris generation at both the articulating surfaces and the cam-post interface, extending the functional life of the implant.

·Anatomical Dish Geometry

The medial and lateral articulating "dishes" are contoured to match the PS femoral condyles, maximizing contact area and distributing loads evenly to prevent localized stress on the polyethylene.

·Snap-Fit Locking Interface

Includes a robust peripheral locking mechanism to ensure the insert remains rigidly attached to the metallic tibial tray, preventing rotation or dissociation under physiological load.

PS Femoral Insert Indications

·Treatment of PCL-Deficient Knees

Indicated for use in Total Knee Arthroplasty when the Posterior Cruciate Ligament (PCL) is absent, damaged, or must be surgically sacrificed to balance the joint.

·Mechanical Joint Stabilization

Used to provide a mechanical substitute for knee stabilization in patients requiring Posterior Stabilized (PS) kinematics to ensure steady joint motion throughout flexion.

·Prevention of Paradoxical Motion

Indicated to enforce controlled femoral roll-back, preventing the "paradoxical" forward sliding of the femur on the tibia that can occur in cruciate-sacrificing designs without a cam-post mechanism.

PS Femoral Insert Specifications

Actual Pictures of PS Femoral Insert

PS Femoral Insert Insights

What is the PS Femoral Insert?

The PS Femoral Insert is the specialized tibial bearing used in "Posterior Stabilized" knee replacements. While the femur has a boxed notch, the insert has a raised central post. Together, they create a mechanical cam-and-post system that replicates the work of the human PCL. It absorbs the forces that would otherwise push the femur too far forward, ensuring the knee remains stable during complex movements.

Applications of PS Femoral Insert

This insert is applied in Total Knee Arthroplasty cases where the surgeon decides to remove the patient's PCL. It is common in severe arthritic conditions where joint balancing is easier to achieve by sacrificing the ligament and using the mechanical stability provided by the PS insert’s post-and-cam design.

Advantages of PS Femoral Insert

The primary advantage is intrinsic joint stability. Because the stabilization is built into the implant mechanics, the patient experiences less joint laxity. Furthermore, the use of Highly Cross-linked Polyethylene (HXPE) reduces the long-term wear of the post itself, ensuring the stabilizing mechanism lasts as long as the rest of the joint replacement components.

Biomechanics of PS Femoral Insert

Biomechanically, the insert post engages the femoral cam during flexion, forcing the femur to move posteriorly (roll-back). This roll-back is essential for achieving high degrees of knee flexion without impingement. The dish geometry ensures that the articulating load is carried across a wide surface area, minimizing wear and maximizing stability.

Surgical Technique of PS Femoral Insert

The surgical technique involves first implanting the matching PS femoral condyle and tibial baseplate. Surgeons use trial inserts of varying thicknesses (e.g., 9mm to 18mm) to check the ligament balance. Once the perfect stability is found, the final PS Femoral Insert is impacted into the tibial baseplate until the snap-fit locking mechanism is engaged.

Postoperative Care of PS Femoral Insert

The mechanical safety provided by the cam-post mechanism gives patients the confidence to start physical therapy earlier. Postoperative care focus remains on regaining full range of motion. The robust stabilization from the insert post reduces the risk of joint instability during early gait retraining.

Conclusion

The PS Femoral Insert is a vital component for restoring stable knee motion. Combining advanced HXPE wear-resistance with a robust mechanical cam-post system, it provides surgeons with a reliable solution for high-demand patients undergoing Total Knee Arthroplasty.

FAQs of PS Femoral Insert

Can the central post of the insert break?

While the post is made of dense polyethylene, breakage is an extremely rare complication typically caused by high-impact trauma or chronic component malalignment. The use of HXPE provides excellent fatigue and impact resistance.

Is the PS insert compatible with a CR femoral component?

No. A PS insert requires a boxed PS Femoral Condyle to work correctly. A CR (Cruciate Retaining) femoral component lacks the cam mechanism required to engage the PS post.

How is the correct thickness determined?

Surgeons use a series of metal trial inserts during surgery to test joint stability in both extension and flexion. They choose the final thickness that provides a stable knee without being too tight to restrict motion.

Does cross-linking affect the strength of the post?

Modern irradiation and annealing processes used to create Highly Cross-linked Polyethylene (HXPE) optimize the balance between wear resistance and fracture toughness, ensuring the central post is both durable and resilient.

Why are PS inserts common in revision surgeries?

In revision surgery, native ligaments are almost always compromised or missing. The PS insert provides a mechanical substitute for stability that does not rely on the patient's damaged native ligaments.

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 - PS Femoral Insert

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.