Philadelphia 76ers guard Jason Richardson underwent successful surgery on his left knee this morning. The procedure was performed by Dr. Jonathan Glashow, the co-Chief of Sports Medicine at Mt. Sinai Medical Center in New York. Dr. Glashow repaired an articular cartilage lesion on the medial femoral condyle in Richardson's left knee. As previously announced, Richardson will miss the remainder of the 2012-13 season. Additional updates will be provided when available.