Ask a doctor - How long does a knee replacement typically last?

Q. How long does a knee replacement typically last?

Doctor Answer is medically reviewed by SecondMedic medical review team.

Answered by Secondmedic Expert

The lifespan of a knee replacement (also known as the longevity of the prosthesis) can vary from person to person and is influenced by several factors. On average, modern knee replacements are designed to last around 15 to 20 years, but many individuals experience longer-lasting benefits.

Factors that can affect the longevity of a knee replacement include:

1. Patient's Age: Younger patients may face a higher likelihood of needing a revision surgery at some point in their lives because the prosthetic joint has to endure more years of wear and tear.

2. Activity Level: More active individuals, especially those who engage in high-impact sports or heavy physical labor, may experience faster wear on the artificial joint.

3. Implant Materials and Design: Advances in implant materials and design can contribute to increased durability. Newer materials, such as highly cross-linked polyethylene, may reduce wear and extend the life of the prosthesis.

4. Surgical Technique: The skill of the surgeon and the precision of the surgical technique can impact the long-term success of a knee replacement.

5. Overall Health: Patients with certain health conditions, such as obesity, diabetes, or autoimmune disorders, may have a higher risk of complications and a potentially shorter lifespan for the knee replacement.

6. Implant Alignment: Proper alignment of the implant during surgery is crucial for its longevity. Poor alignment can lead to uneven wear and premature failure.

It's important for individuals who have undergone knee replacement to attend regular follow-up appointments with their orthopedic surgeon for monitoring and evaluation. If any issues or signs of wear are identified, the surgeon can determine the appropriate course of action, which may include a revision surgery.

Advancements in medical technology and ongoing research continue to improve the design and materials used in knee replacements, potentially extending their lifespan. However, the individual circumstances of each patient play a significant role in determining how long a knee replacement will last.