A leading orthopedic surgeon told The Post Phil Jackson’s possible four- to six-month timetable for Carmelo Anthony seems a worst-case scenario, allowing for the possibility other damage is found during knee surgery this weekend. Dr. Wellington K. Hsu, an orthopedic surgeon and endowed professor at Northwestern University, said if Anthony’s impending surgery is simply a debridement of the patellar tendon, rehab of eight weeks before taking the court again is usually standard. Hsu said Jackson may have an indication there is more damage, such as meniscus cartilage, that won’t be known until the midst of the arthoscopic surgery. If there is more work to be done, four-to-six months is a good rehab range, Hsu said.