Johnson & Johnson executives knew years before they recalled a troubled artificial hip in 2010 that it had a critical design flaw, but the company concealed that information from physicians and patients, according to internal documents disclosed on Friday during a trial related to the device’s failure.
The company had received complaints from doctors about the device, the Articular Surface Replacement, or A.S.R., even as it started marketing a version of it in the United States in 2005. The A.S.R.’s flaw caused it to shed large quantities of metallic debris after implantation, and the model failed an internal test in 2007 in which engineers compared its performance to that of another of the company’s hip implants, the documents show.
