The Tibial Insert UHMWPE [Polyethylene] is a key component of the Tibial Bearing System within Total Knee Replacement / Total Knee Arthroplasty – TKA systems. It is positioned on top of the compatible Tibial Metal Component and functions as the Bearing Interface between the femoral and tibial sides of the artificial knee joint.
The insert is manufactured from UHMWPE – Ultra-High-Molecular-Weight Polyethylene, according to the product designation. UHMWPE is a polymeric material commonly used in Orthopedic Joint Replacement Bearings. The upper surface of the insert forms the Articulating Surface that interacts with the compatible Femoral Component during knee movement, while its lower surface interfaces with the compatible Tibial Component according to the system design.
The product range includes five implant sizes: Extra Small, Small, Medium, Large, and Extra Large. Each size is available in four thickness options: 8 mm, 10 mm, 12 mm, and 15 mm. This results in a total of 20 different configurations, allowing selection according to component dimensions, Joint Space, Soft-Tissue Balance, and the findings obtained during Intraoperative Trialing.
The variety of sizes and insert thicknesses allows the surgeon to compare different Bearing Configurations during surgery, supporting selection of the appropriate Final Tibial Insert within the limits of Component Compatibility and the approved Surgical Technique.
Each size/thickness combination carries an individual AMS Product Code, facilitating Implant Identification, Procurement, Surgical Set Preparation, Inventory Management, and Stock Control.
What Is a Tibial Insert?
A Tibial Insert is a polymer bearing component positioned or secured on the Tibial Baseplate / Tibial Metal Component within a Total Knee Prosthesis.
It functions as the articulating interface between:
Femoral Component ↔ Tibial Insert ↔ Tibial Metal Component
The upper surface of the insert interacts with the femoral component during:
- Knee Flexion
- Knee Extension
- Femoro-Tibial Articulation
- Functional Range of Motion
Insert Thickness is one of the variables assessed by the surgeon during Trialing to determine the appropriate bearing configuration according to the system design.
Product Components and Design
- UHMWPE Bearing Body
The main body of the insert, manufactured from:
UHMWPE – Ultra-High-Molecular-Weight Polyethylene
and forming the principal functional portion of the Bearing Component.
- Femoral Articulating Surface
The upper surface designed to articulate with the compatible Femoral Component during movement of the artificial joint.
It forms one of the surfaces of the Femoro-Tibial Bearing Couple.
- Tibial Component Interface
The lower surface designed to interface with the Compatible Tibial Metal Component / Baseplate.
The exact Locking Mechanism and its dimensions are not specified in the supplied product data. Therefore, the approved Technical Datasheet should be consulted before publishing these details.
- Central Geometry / Post Feature
The product image shows a prominent central geometric feature within the insert design.
Its exact function depends on the design of the Knee Prosthesis, and the supplied table does not specify whether it is associated with a particular constraint or stabilization concept. Therefore, the system should not be classified as PS or CR based solely on the product image.
- Variable Insert Thickness
The insert is available in four thicknesses:
8 mm – 10 mm – 12 mm – 15 mm
for each of the five available sizes.
Product Application
The Tibial Insert UHMWPE is used in Total Knee Arthroplasty – TKA as a bearing component between the compatible Femoral Component and Tibial Metal Component.
During surgery, several factors are generally assessed when selecting the appropriate insert, including:
- Tibial Component Size
- Femoral Component Compatibility
- Flexion Gap
- Extension Gap
- Soft-Tissue Balance
- Joint Stability
- Range of Motion
- Insert Thickness
- Intraoperative Trialing
The Final Insert is installed after confirming that the selected size and thickness are compatible with the other components of the Total Knee System.
The product should be selected and used by a Qualified Orthopedic Surgeon in accordance with the approved IFU and Surgical Technique.
Key Benefits
UHMWPE Bearing Interface
The UHMWPE material provides a polymeric bearing interface designed to function between the femoral and tibial components within the Artificial Knee Joint.
Five Component Sizes
The product range is available in five sizes:
Extra Small – Small – Medium – Large – Extra Large
providing a broad range of Component Sizing options.
Four Thickness Options
Each size is available in:
8 / 10 / 12 / 15 mm
providing multiple Insert Thickness Configurations during trialing.
20 Available Configurations
The product range combines:
5 Sizes × 4 Thicknesses = 20 Configurations
providing an organized product portfolio for the Total Knee System.
Intraoperative Trialing Flexibility
The range of thicknesses allows the surgeon to compare different bearing options while assessing:
- Flexion / Extension Gaps
- Soft-Tissue Tension
- Joint Stability
- Final Knee Construct
Component Compatibility
The insert functions as part of an integrated system with compatible Femoral and Tibial Components.
Clear Implant Identification
Each configuration has an individual AMS Code, facilitating:
- Implant Identification
- Surgical Set Preparation
- Procurement
- Inventory Management
- Stock Control
Technical Specifications
Extra Small
| Product Code | Size | Thickness |
| AMS 120.750.008 | Extra Small | 8 mm |
| AMS 120.750.010 | Extra Small | 10 mm |
| AMS 120.750.012 | Extra Small | 12 mm |
| AMS 120.750.015 | Extra Small | 15 mm |
Small
| Product Code | Size | Thickness |
| AMS 120.751.008 | Small | 8 mm |
| AMS 120.751.010 | Small | 10 mm |
| AMS 120.751.012 | Small | 12 mm |
| AMS 120.751.015 | Small | 15 mm |
Medium
| Product Code | Size | Thickness |
| AMS 120.752.008 | Medium | 8 mm |
| AMS 120.752.010 | Medium | 10 mm |
| AMS 120.752.012 | Medium | 12 mm |
| AMS 120.752.015 | Medium | 15 mm |
Large
| Product Code | Size | Thickness |
| AMS 120.753.008 | Large | 8 mm |
| AMS 120.753.010 | Large | 10 mm |
| AMS 120.753.012 | Large | 12 mm |
| AMS 120.753.015 | Large | 15 mm |
Extra Large
| Product Code | Size | Thickness |
| AMS 120.754.008 | Extra Large | 8 mm |
| AMS 120.754.010 | Extra Large | 10 mm |
| AMS 120.754.012 | Extra Large | 12 mm |
| AMS 120.754.015 | Extra Large | 15 mm |
Technical Overview
Product Name: Tibial Insert UHMWPE [Polyethylene]
Product Type: Tibial Bearing Insert
System: Total Knee Replacement System
Procedure: Total Knee Arthroplasty – TKA
Material: UHMWPE – Ultra-High-Molecular-Weight Polyethylene
Available Sizes: Extra Small / Small / Medium / Large / Extra Large
Number of Sizes: 5
Available Thicknesses: 8 / 10 / 12 / 15 mm
Thickness Range: 8–15 mm
Thickness Options per Size: 4
Total Available Configurations: 20
Functional Interface: Femoral Component / Tibial Metal Component
Selection Method: Component Sizing & Intraoperative Trialing
Identification: Individual AMS Product Code for every Size / Thickness configuration
Product Features
- UHMWPE Tibial Bearing Insert
- Designed for compatible Total Knee Replacement Systems
- Functions as the Bearing Interface within the Femoro-Tibial Articulation
- Five different component sizes
- Sizes ranging from Extra Small to Extra Large
- Four thickness options for each size
- Available thicknesses: 8, 10, 12, and 15 mm
- A total of 20 Implant Configurations
- Provides multiple options during Intraoperative Trialing
- Allows selection of thickness according to the Final Knee Construct
- Supports assessment of Flexion and Extension Gaps according to the surgical technique
- Designed to function with compatible Femoral Component and Tibial Metal Component
- Specifically designed for the Artificial Knee Bearing Interface
- Individual AMS Code for each size/thickness combination
- Facilitates Implant Identification and Surgical Set Preparation
- Supports Inventory Management, Procurement, and Stock Control
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