While the stress reaction is less serious than a stress fracture, it consolidates shock at one spot in the foot, and can lead to a stress fracture if left untreated.
The 38-year-old Wallace, who came out of retirement after not playing the past two seasons, has not practiced in 10 days and has not played in the past four games. While the Knicks are officially saying he's day-to-day, Zagoria contacted a doctor who indicated that such an injury likely means that Wallace will miss a "minimum" of three weeks.
The Knicks have struggled with injuries to their big men this season. Amare Stoudemire still has not played this season while recovering from a knee injury, and Marcus Camby has missed time with plantar fasciitis. Wallace has averaged 7.2 points in 20 games for the Knicks this season.