The surgeon will insert a tiny camera to examine Utley's painful right hip along with other pencil-thin instruments to repair it.
From the Phillies' description, Temple University orthopedic surgeon Pekka Mooar suspects that Utley has a tear in the labrum, the thick rubbery cartilage on the edge of the hip socket; some excess bone growth impinging on the joint; or both.
It also could be cartilage that has broken off from the joint, Mooar said.
The Phillies estimated that Utley's full recovery will take four to six months.