Zimmernexgensizingchart

Zimmer NexGen Sizing Chart

The Zimmer NexGen Complete Knee Solution is one of the most widely used and clinically proven total knee systems in the world. It offers a variety of implant options and sizes to suit different patient needs and preferences. This article will provide a brief overview of the Zimmer NexGen sizing chart and how to use it for selecting the appropriate implant components.

Implant Interchangeability

One of the features of the Zimmer NexGen system is the implant interchangeability, which allows the surgeon to mix and match different femoral, tibial, and patellar components within the same size range. This gives the surgeon more flexibility and choice in achieving optimal fit, stability, and alignment for each patient. The table below shows the implant interchangeability for the Zimmer NexGen system.

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Femoral Component

Tibial Component

Patellar Component

NexGen CR-Flex Fixed Bearing Knee

NexGen Non-Modular Tibial Base Plate

NexGen All-Poly Patella

NexGen Gender Solutions High-Flex Implants

NexGen Modular Tibial Base Plate

NexGen Modular Patella

NexGen Legacy LPS-Flex Knee

NexGen Stemmed Nonaugmentable Tibial Component

NexGen Dome Patella

Implant Sizing

The Zimmer NexGen system offers a range of implant sizes to accommodate different anatomies and bone quality. The implant sizes are designated by letters (A, B, C, D, E) for femoral components and numbers (1, 2, 3, 4, 5) for tibial components. The patellar components are sized according to their diameter in millimeters (22, 24, 26, 28, 30, 32, 34, 36). The table below shows the implant sizing for the Zimmer NexGen system.

Femoral Component Size

Tibial Component Size

Patellar Component Size (mm)

A

1

22-28

B

2

24-30

C

3

26-32

D

4

28-34

E

5

30-36

How to Use the Sizing Chart

To use the Zimmer NexGen sizing chart, the surgeon needs to follow these steps:

• Determine the type of implant that best suits the patient's needs and preferences. For example, if the patient requires high flexion capability, the surgeon may choose the NexGen CR-Flex Fixed Bearing Knee or the NexGen Gender Solutions High-Flex Implants.

• Measure the patient's femoral and tibial dimensions using the appropriate instruments and templates. The surgeon should aim for optimal coverage and alignment of the implant components with respect to the bone surfaces.

• Select the femoral component size that matches the measured dimensions. The surgeon should also consider factors such as bone quality, ligament balance, and joint line restoration.

• Select the tibial component size that matches the femoral component size. The surgeon should also consider factors such as bone loss, stability, and rotation.

• Select the patellar component size that matches the diameter of the native patella or the resected patella. The surgeon should also consider factors such as patellar thickness, tracking, and subluxation.

• Verify the implant fit and function using the provisionals and trial components. The surgeon should check for adequate range of motion, stability, alignment, and balance of the knee joint.

• Implant the final components using the appropriate surgical technique and fixation method. The surgeon should follow the manufacturer's instructions and recommendations for implantation and postoperative care.

The Zimmer NexGen sizing chart is a useful tool for selecting the appropriate implant components for total knee arthroplasty. However, it is not a substitute for clinical judgment and experience. The surgeon should always consider the individual patient's anatomy, pathology, and expectations when choosing the implant type and size.

References

: NexGen Complete Knee Solution. Zimmer Biomet. [Accessed on 02 Sep 2023].

: NexGen Complete Knee Solution - Specifications. Zimmer Biomet. [Accessed on 02 Sep 2023].

: NexGen Complete Knee Solution - Surgical Technique. Zimmer Biomet. [Accessed on 02 Sep 2023].