Stryker (NYSE:SYK) said today that the FDA sent it a warning letter stemming from an November 2012 inspection of a plant in Portage, Mich.

The Kalamazoo, Mich.-based medical device company said the letter, based on "quality system observations," flagged it for failing to tell the federal watchdog agency of a product recall and for marketing devices including its Neptune waste management system without 510(k) clearance from the FDA.

"The letter acknowledged that Stryker Instruments has already submitted corrective action plans for the quality system and recall observations. The company is fully cooperating with the FDA to resolve these matters in a comprehensive and timely manner," according to a press release.

In January, Stryker reported a 33% 4th-quarter profit slide on a $133 million charge stemming from the recalls of its Rejuvenate and ABG II hip implants.