DePuy’s Sigma rotating platform knee system
Johnson & Johnson (NYSE:JNJ) subsidiary DePuy Orthopaedics landed premarket approval from the FDA for the use of its new AOX antioxidant polyethylene material with its Sigma and LCS Complete knee systems.
The new material is designed to improve wear resistance and long-term oxidative stability with the Warsaw, Ind.-based orthopaedics giant’s Sigma rotating platform knee system and the LCS Complete mobile bearing knee system.
The implants include AOX polyethylene, which uses a new antioxidant that stabilizes free radicals without affecting the mechanical properties or strength of the polyethylene, according to a press release.
DePuy was the target of a Stryker (NYSE:SYK) lawsuit last month. The Kalamazoo, Mich.-based orthopedics giant leveled suits against DePuy, Wright Medical Group (NSDQ:WMGI) and Zimmer Holdings (NYSE:ZMH).
The lawsuits allege that all three companies violate a Stryker patent for "Acetabular Cup Assembly With Selected Bearing," according to court documents.
DePuy hasn’t been a stranger to the court room this year. In October, a former spokesmodel for DePuy joined a U.K. lawsuit against the J&J subsidiary after the artificial hip she modeled, and encouraged others to get, prematurely wore down.
Penny Brown, a former gymnast, began advertising for DePuy in 2004 after receiving an articular surface replacements (ASR) to relieve her arthritis pain. In 2009, after the implant left her with constant pain and a "clunking" sensation when walking, doctors told her that the implant had worn out prematurely and would need to be removed.
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