Portland Trail Blazers guard Wesley Matthews underwent a successful arthroscopic debridement of his left elbow today. The procedure was performed by Dr. Ken Yamaguchi at Washington University Barnes-Jewish Hospital in St. Louis, Mo. Matthews’ recovery time is expected to be 3-4 weeks. In his fourth NBA season and third with the Trail Blazers in 2012-13, Matthews averaged 14.8 points, 2.8 rebounds, a career-best 2.5 assists, a team-high 1.30 steals and 34.8 minutes in 69 games (all starts). His career-high 169 3-pointers last year rank fourth on Portland’s all-time list for 3-pointers made in a season.