Have you experienced complications following high-flexion knee replacement surgery that involved a high-flex knee made by DePuy Orthopaedics? Currently, the company markets two such devices, the Sigma CR150 High-flex Knee System and the Sigma RP-F Knee System, both of which are part of DePuy’s P.F.C. Sigma Revision Knee System line.
Lawyers at our firm who specialize in defective medical device litigation are investigating reports of alleged failures that might be tied to the design of these knee replacement systems.
If you received either the Sigma CR150 High-flex Knee System or Sigma RP-F Knee System and have experienced pain, loosening, and/ or difficulty walking or bearing weight since your knee replacement surgery, or you have had to undergo painful revision surgery because of knee replacement failure, we would like to hear from you. You may be entitled to receive compensation for your injuries if it is determined that the design of the Sigma CR150 High-flex Knee System or Sigma RP-F Knee System contributed to your complications. For a free, no obligation evaluation of your case, we urge you to contact one of our defective medical device lawyers today.
High-Flex Knee Complications
The Sigma CR150 High-flex Knee and Sigma RP-F Knee systems are used in knee replacement surgeries known as high-flexion (high-flex) procedures. The high-flex knee is a replacement where more of the back of the knee is removed so that the patient may bend it farther. High-flex knee replacement is usually considered for highly active patients who wish to continue high level activities after their knee replacement. High-flex procedures require that more bone be removed compared to traditional knee replacement. It is also important to note that high-flexion will not be achieved in patients whose mobility is very severely restricted before the surgery.
Symptoms that could indicate a problem with either the Sigma CR150 High-flex Knee System or Sigma RP-F Knee System include:
- Loosening and instability
- Heat or warmth in the knee (normal for the first few months after knee surgery, but should not persist beyond)
- Pain beyond normal recovery period (may range from minor soreness to constant throbbing)
Recently, some studies have indicated that patients considering high-flex knee replacement should proceed with caution. A study conducted between 2003 and 2004 involving one popular high-flex knee (not the Sigma CR150 High-flex Knee or Sigma RP-F Knee systems) that included 47 patients found that at the 32-month mark, 38% experienced aseptic loosening around the femoral components and 21% required a revision surgery due to progressing loosening and pain. The study also found that the higher the flexion achieved (125° compared to 136 °), the more likely patients were to experience loosening of the implant.
Another study compared high-flex prosthetics with normal prosthetics and actually revealed that for the average patient without any special demands, the additional knee flexion provided by the high-flex design made no significant difference in range of motion. Taken together, these two studies indicate that for most patients, the increased risks of pain, loosening, and even revision surgery that may be associated with devices like the Sigma CR150 High-flex Knee and Sigma RP-F Knee systems may outweigh their benefits.
Legal Help for Victims of DePuy High-Flex Knee Implant Failures
If you experienced an early failure of a Sigma CR150 High-flex Knee or Sigma RP-F Knee made by DePuy Orthopaedics, you may have valuable legal rights. For a free evaluation of your case, please fill out our online form, or call 1-800-YOURLAWYER (1-800-968-7529).