The Minnesota Timberwolves announced Wednesday that center Theo Ratliff underwent successful arthroscopic surgery on his right knee on Tuesday (Dec. 18). Dr. James R. Andrews of the Alabama Sports Medicine & Orthopaedic Center in Birmingham, Ala. performed the operation and repaired cartilage. Ratliff is expected to miss the next six weeks as he rehabs from the surgery.

Ratliff, acquired via trade from the Boston Celtics on July 31, 2007, has appeared in six games for the Wolves this season, averaging 8.2 points, 4.5 rebounds and 2.8 blocks in 26.8 minutes per game. The 12-year NBA veteran has missed the last 13 games due to soreness in his right knee.