Knee replacements are a very common procedure, carried out on over 100,000 patients across the UK every year, according to figures by NICE. While they produce excellent results, they are not designed to last forever.

Here, we explore how long knee replacements last, the factors that influence their lifespan, and when revision surgery may be required.

What is the average lifespan of a knee replacement?

The average lifespan of a knee replacement can vary, but studies suggest that most knee replacements last between 15 to 20 years. According to research published in The Lancet, about 90% of knee replacements last 15 years, and around 80% last 20 years. This longevity depends on various factors, including the type of implant used, the patient’s age, activity level, and overall health.

Advancements in surgical techniques and materials have significantly improved the durability of knee replacements. Modern implants are designed to withstand a considerable amount of wear and tear, making them a reliable option for those suffering from severe knee arthritis or injury.

What factors influence how long a knee replacement lasts?

Several factors can influence the lifespan of a knee implant. Younger patients may put more stress on their knee over time due to higher activity levels, potentially reducing the lifespan of the implant. Conversely, older patients may have a longer-lasting knee replacement if their activity level is lower.

High-impact activities such as running, jumping, or heavy lifting can accelerate the wear and tear on a knee replacement. Patients are usually advised to engage in low-impact activities like walking, swimming, or cycling to prolong the life of their implant.

Excess body weight can also place additional stress on the knee joint, potentially leading to faster degradation of the implant. Maintaining a healthy weight can help reduce the strain on a knee and extend the implant’s lifespan.

Finally, the skill and experience of the surgeon performing the knee replacement play a crucial role in the success and longevity of the implant. Proper alignment and secure placement of the implant are essential for optimal function and durability.

Why might I need revision surgery?

Revision surgery may be necessary if a knee replacement fails or wears out over time. Some common reasons for revision surgery include:

Implant Loosening – Over time, the bond between the implant and the bone can weaken, causing the implant to become loose and painful. This can lead to instability in the knee and difficulty walking.

Bacterial Infection – Although rare, infections can occur around the implant causing pain and inflammation.

Wear and Tear – The materials used in knee replacements, such as plastic and metal, can wear down over time. This can lead to pain, swelling, and decreased function of the knee.

Fractures – Trauma or accidents can cause fractures around the knee replacement, leading to the need for revision surgery to repair the damage and restore function.

Instability or Misalignment – If the knee replacement becomes misaligned or unstable, revision surgery may be needed to correct the position and ensure proper function of the knee joint.

Revision surgery is typically more complex than the initial knee replacement procedure and may require a longer recovery period. However, it can effectively address issues with the original implant and restore the patient’s mobility and quality of life.

If your knee replacement is causing any of the issues mentioned and you’d like to discuss revision surgery, schedule an appointment with Mr Alazzawi. His expertise and personalised approach will help determine the best treatment plan, ensuring you achieve the best possible outcome.