Melvin Gordon works back from surgery

San Diego Chargers running back Melvin Gordon works out during an offseason practice.Melvin Gordon is ready to move on from his rookie season.

There is just one aspect he must put behind him first.

The Chargers running back participated in on-field drills Monday. Afterward, he acknowledged he is not yet 100 percent, still working back from a January knee procedure. Sources said that Gordon underwent microfracture surgery and was given a recovery timetable of four to six months.

That phrase, microfracture surgery, carries an ominous connotation.

While some past cases warrant the association, a high concern level about Gordon’s short- and long-term recovery is not sensed here. He expects to be…