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The acetabular reamer plays a crucial role during hip surgery by specifically shaping the cup area of the hip joint to prepare it for the implant. This process involves removing a precise amount of bone to create a cavity that matches the dimensions of the hip prosthesis. The shape and contour of the reamer are designed to ensure that the implant fits securely and functions properly within the joint, promoting stability and longevity post-surgery.

Other options do touch on relevant surgical functions, but they do not accurately describe the specific task of an acetabular reamer. While cutting and shaping bone is a general function applicable to many surgical tools, the acetabular reamer's primary purpose is much more specialized, as it addresses the unique requirements of the hip joint preparation. The processes of removing cement and holding bones refer to different aspects of orthopedic procedures which are not aligned with the operation of the acetabular reamer. Thus, the primary focus on shaping the cup area distinguishes this tool's role within the surgical context.