Kenneth Dixon‘s meniscus tear is more extensive than the Baltimore Ravens originally believed.

The second-year running back is expected to miss the entire 2017 season after undergoing surgery to repair his medial meniscus on Tuesday, NFL Network Insider Ian Rapoport reported, via a source informed for the situation.

Before Dixon went under the knife, the Ravens hoped he would miss just a few weeks with a “trim” rather than a full repair. While Tuesday’s procedure bodes well for Dixon’s long-term health, the recovery timetable is four-to-five months.

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