Here is the team's release:
Seattle Seahawks Head Orthopedic Surgeon, Dr. Ed Khalfayan, performed successful surgery on Rob Sims today to repair a torn left pectoral muscle. Sims is expected to make a full recovery. Normal rehabilitation from this type of surgery is 4-6 months.
Khalfayan was assisted by fellow team orthopedist Dr. Mike McAdam. (Shameless MD plug, apparently.)