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KNEE REPLACEMENT

An incision is made in the knee.

KNEE REPLACEMENT

Parts of the femur, tibia, and patella are cut and removed.

KNEE REPLACEMENT

Prostheses are put in place. Cement is sometimes used.

HIP REPLACEMENT

The femoral head is removed and replaced with a metal stem and new femoral head.

HIP REPLACEMENT

The surface of the socket is removed and replaced with a metal socket.

HIP REPLACEMENT

A spacer is inserted between the ball and the socket to allow for gliding.

SOURCES: Mayo Clinic, University of Utah Health Care, The American Academy of Orthopaedic Surgeons, Medical Multimedia Group, US Agency for Healthcare Research and Quality, Brigham and Women's Hospital

PATRICK GARVIN/GLOBE STAFF