Study Evaluates Hip Implant Failure in Patients Implanted with Polyethylene Version of DePuy Pinnacle Hip Implant

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New Study Evaluates Hip Implant Failure in Patients Implanted with DePuy Pinnacle Hip ImplantOverview: A study published in the Journal of Bone & Joint Surgery evaluates four patients who underwent hip revision surgery with the polyethylene version of the DePuy Pinnacle hip implant. According to the study, these patients all experienced spontaneous dissociations of offset, face-changing polyethylene acetabular liners. Previous research has already linked the metal-on-metal version of the DePuy Pinnacle hip implant to a number of side effects.

  • The DePuy Pinnacle hip implant is available as a metal-on-metal hip implant or as a metal-on-polyethylene
  • The metal-on-metal version of the Pinnacle has been linked to complications, including early revision surgery, tissue and bone damage
  • The study looked at four patients who underwent revision surgery due to the dissociation of their polyethylene liners

Product: DePuy Pinnacle hip implant

Manufacturer: DePuy Orthopaedics/ Johnson & Johnson

Side Effects & Complications

  • High failure rate
  • Necrosis (tissue death)
  • Increased levels of cobalt and chromium ions
  • Pain at the implant, sometimes spreading to the groin and back
  • Osteolysis (bone loss)
  • Fluid collections/solid masses around the hip joint

DePuy Pinnacle with Polyethylene Liners

The study looked at four patients who were implanted with the DePuy Pinnacle hip implant using a polyethylene acetabular liner. All of the patients were female, with an average age of fifty three years. The patients all experienced spontaneous dissociation of the off-set facing changing liner, which occurred without any direct trauma. The women reported squeaking sounds and underwent revision surgery. The researchers reviewed the patients’ symptoms and analyzed radiographs to determine the position of the acetabular component. The authors concluded that “The combination of a vertically positioned acetabular component and an offset, face-changing liner resulted in impingement and dissociation of the liner from the shell in four patients. Proper acetabular component positioning, rather than the routine use of uniquely designed polyethylene liners, is critical to maximizing implant stability in total hip arthroplasty.”

 

Pinnacle as a Metal-on-Metal Hip Implant

The metal-on-metal version of the Pinnacle, which does not contain a polyethylene cup liner, has already been the subject of safety concerns in recent years. As with other types of all-metal hip replacements, the Pinnacle is associated with premature failure and painful complications, including metallosis, soft tissue reaction, bone damage, pain, swelling and limited mobility. In 2010, the U.S. Food and Drug Administration (FDA) received 550 reports of complication associated with the device. Many reports cited hip and groin pain, the presence of metal ions and the acetabular cup moving out of position.