Knee arthroplasty can offer long-term relief from severe knee pain due to arthritis, injury, or a degenerative condition. Still, it’s common for patients considering this procedure to wonder, “How long does a knee replacement last?”
It often depends on your activity level, implant type, and overall health, but patients can typically expect their knee replacement to last around 15 to 20 years. Below, we’ll explore the factors that influence this longevity and signs that may indicate the need for revision surgery.
What Is a Knee Replacement?
Before we dive into the lifespan of a knee replacement, it’s important to understand the procedure itself. A knee replacement surgically removes the damaged parts of the knee joint and replaces them with artificial components, which are typically made of metal, plastic, or ceramic. This procedure aims to relieve pain and improve mobility and function in patients with severe knee damage, often caused by osteoarthritis or trauma.
The Knee Replacement Lifespan: What To Expect
The expected lifespan of a knee replacement depends on a variety of factors, but as mentioned earlier, modern knee implants typically last 15 to 20 years or longer. Advances in surgical techniques and implant materials have significantly improved the longevity of knee replacements in recent years, with newer hybrid materials able to withstand up to 30 years of ‘wear and tear’ in simulations.
Factors That Influence Knee Replacement Longevity
Type of Implants
The materials used in knee replacements play a critical role in determining how long the implant will last. Most knee replacements are made of metal alloys, such as titanium, paired with a plastic component like polyethylene. These materials are durable, but their wear over time can affect the implant’s performance.
- Titanium Implants: Titanium is commonly used for knee replacement implants due to its strength and lightweight properties. How long does a titanium knee replacement last? On average, they can last up to 20 years, though this depends on other factors like how active the patient is.
- Other Materials: Some implants are made from other metal alloys, ceramic, or plastic combinations. Each material has a different durability, some lasting longer than others depending on the stress they endure.
Activity Level
Your postoperative activity level plays a key role in how long your knee replacement lasts. For instance, active individuals who participate in high-impact activities, such as running or jumping, may experience more wear and tear on their knee implants. These activities can contribute to faster degradation of the artificial components.
While high-impact activities can accelerate wear on the implant, a sedentary lifestyle carries its own risks. Inactivity can lead to muscle weakness, joint stiffness, weight gain, and reduced circulation—factors that not only hinder recovery but may also negatively impact the longevity of the implant. Regular low- to moderate-impact activity, such as walking, cycling, or swimming, helps strengthen the muscles around the knee, supports healthy joint function, and reduces the risk of chronic health issues.
Overall Health and Weight
A patient’s overall health and weight are also crucial factors in determining knee replacement longevity. Being overweight can increase stress on the knee joint, causing the implant to wear out more quickly. Patients who maintain a healthy weight and engage in appropriate rehabilitation exercises are more likely to enjoy a longer-lasting knee replacement.
Additionally, underlying health conditions such as diabetes or cardiovascular issues can affect healing and may contribute to complications after surgery, potentially shortening the lifespan of the implant.
Surgical Technique and Implant Alignment
Your surgeon’s skill and the implant’s alignment during surgery also play an important role. A well-aligned implant and precise surgical technique are essential for optimal function and wear resistance. Misalignment or improper positioning of the implant can lead to uneven wear, discomfort, and a need for revision surgery sooner.
What To Expect One Year After Knee Replacement
The first year after knee replacement is critical for recovery and achieving the best possible outcome. Most individuals will experience significant improvements in knee function and a reduction in pain during this time, especially with the help of physical therapy and rehabilitation exercises to strengthen the knee and improve mobility.
However, while most patients can return to normal activities within 6 months to a year, you should have realistic expectations as you prepare for your procedure. Full recovery can take up to a year, and you may need to avoid high-impact activities to protect the knee implant. Following your surgeon’s advice and adhering to your postoperative care plan will maximize the chances of a long-lasting knee replacement.
Signs That May Indicate the Need for Revision Surgery
While knee replacements are durable, they are not indestructible. Over time, some patients may experience a complication or material fatigue that requires revision surgery. Here are a few signs that could indicate the need for further treatment:
- Persistent Pain or Swelling: If pain and swelling persist long after the initial recovery period, this could be a sign of implant failure, loosening, or infection.
- Limited Mobility: Difficulty bending or straightening your knee or a noticeable decrease in your knee’s range of motion may indicate issues with the implant’s alignment or wear.
- Implant Loosening: Over time, the artificial components may begin to loosen from the bone, causing instability or pain. This is more common in older knee replacements but can occur with any implant subjected to significant stress.
- Infection: In rare cases, infections may occur that compromise the implant. This can lead to serious complications and may require revision surgery to prevent further damage.
Explore Your Options
A knee replacement can provide long-lasting relief from pain and improve the quality of life for patients suffering from knee joint damage. If you are considering knee replacement surgery or experiencing issues with an existing implant, get in touch with our specialists by using our online form or calling Surgical Solutions Network at (888) 888-4250.