As a consultant orthopaedic specialist, I regularly encounter questions about knee implants. These medical devices have revolutionised how we approach knee joint diseases and injuries. Here, we’ll explore what knee implants are, the types available, and what you can expect during and after a knee replacement procedure.

Understanding Knee Implants

A knee implant, also known as a prosthesis, is designed to replace a knee that has been damaged by injury or disease such as osteoarthritis. The goal of a knee implant is to replicate the knee’s natural ability to roll and glide as it bends, offering the patient a chance to regain mobility and live a life free from knee pain.

Types of Knee Implants

There are several types of knee implants, which can be categorised based on the following factors:

1. The Material:

  • Metal alloys: Most knee implants use a combination of metals, such as cobalt-chromium alloys and titanium alloys. These are known for their strength and durability.
  • High-density polyethylene: This is a form of plastic used to create the insert that sits between the two metal components to facilitate smooth movement.

2. The Design:

  • Fixed-bearing implants: These are the most common type and feature a plastic cushion fixed to the metal platform.
  • Mobile-bearing implants: In these, the plastic insert can rotate slightly, potentially reducing wear and tear.

3. The Extent of Knee Replacement:

  • Total knee replacement: All components of the knee joint are replaced.
  • Partial knee replacement: Only the damaged areas of the knee are replaced, preserving as much of the natural knee as possible.

UK Data on Knee Implants

*According to the National Joint Registry, there were nearly 108,000 primary knee replacement procedures in the UK in 2019, reflecting the widespread use and success of knee implants.

Frequently Asked Questions

Q: How long does a knee implant last?

A: Based on UK data, about 95% of knee implants last over 10 years, and 85% last over 20 years1. However, individual results can vary based on factors such as age, weight, activity level, and the specific type of implant used.

Q: What’s recovery like after a knee implant surgery?

A: Recovery varies from person to person. Generally, most patients are able to fully weight bear and start physiotherapy the day after surgery. Full recovery often takes around 3 to 6 months.

A Step Towards Pain-Free Mobility

As an orthopaedic surgeon, my mission is to help regain mobility and improve quality of life. I’m one of the UK’s first surgeons to use 3D-planned patient-specific knee implants. These are customised to the individual, providing a fit that more closely resembles the natural knee, potentially enhancing comfort and longevity.

If you’re experiencing knee pain and think a knee implant may be the solution, I invite you to get in touch with my team to schedule a consultation. Together, we can discuss your options and take the first steps towards a more comfortable, active life.

Footnotes

*National Joint Registry. (2020). 17th Annual Report 2020.