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Total Hip Replacement Implant Parts Explained

A clinical anterior-posterior (AP) X-ray of a human pelvis showing successful bilateral total hip replacements. The high-contrast image clearly displays the metal femoral stems, acetabular shells, and spherical ball joints (heads) perfectly aligned within the pelvic bone structure.

Total Hip Replacement: The Parts Explained

by Cory Calendine, MD, Orthopedic Surgeon, Hip and Knee Specialist, Updated August 31, 2021

Total hip replacement (THR), or hip arthroplasty, is a highly successful surgical procedure designed to alleviate chronic pain and restore mobility by replacing damaged joint surfaces with advanced prosthetic components. A standard hip implant consists of four primary parts: the acetabular shell (cup), a durable plastic liner, a spherical femoral head (ball), and a femoral stem. By addressing bone-on-bone friction caused by osteoarthritis, rheumatoid arthritis, or avascular necrosis, these biocompatible materials replicate the natural mechanics of the hip joint. Understanding these components is the first step for patients in Franklin, TN, and beyond who are transitioning from conservative treatments to a long-term surgical solution for joint health.

When it comes to improving quality of life, hip replacement is one of the most successful surgeries in medicine. Orthopaedic surgeons perform more than 300,000 hip replacements in the US every year. Hip implants consist of (4) basic plastic and metal components that replace the bone-on-bone surface damage caused by joint arthritis. In the video below, Dr. Calendine discusses the actual implant components involved in total knee replacement surgery.

https://www.youtube.com/embed/xL5Egqu7ZA0

Is Hip Replacement Right for Me?

If you’re one of the millions of Americans suffering from pain caused by arthritis or an injury to the hip, and you haven’t experienced adequate relief with conservative treatment options, hip replacement surgery might be right for you. Hip replacement surgery can be an effective option for patients with:

  • Severe hip pain or stiffness resulting from noninflammatory degenerative joint disease (including osteoarthritis, traumatic arthritis, or avascular necrosis), and inflammatory rheumatoid or post-traumatic joint arthritis, and
  • Joint pain patients who haven’t experienced adequate relief with conservative treatment options, like bracing, medication or joint fluid supplements

RELATED INFORMATION:

Cory Calendine, MD, is a board-certified orthopaedic surgeon specializing in anterior hip replacement, robotic joint replacement, and partial and total hip and knee replacement at the Bone and Joint Institute of Tennessee in Franklin, Tennessee. If you are struggling with persistent hip or pain and are looking for the latest treatment options, CONTACT Dr. Calendine for an evaluation today.

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FREQUENTLY ASKED QUESTIONS

Common Questions From Readers

What are the four main parts of a hip replacement implant?
A total hip replacement typically utilizes four components: – Acetabular Shell: A metal cup that fits into the pelvic socket. – Liner: A durable plastic or ceramic insert that fits inside the cup. – Femoral Head: A metal or ceramic ball that replaces the top of the femur. – Femoral Stem: A metal piece that fits into the thigh bone to provide a stable base for the ball.
Modern implants are made from biocompatible materials designed to be accepted by the body. These usually include titanium or cobalt-chromium alloys for the metal parts, and highly cross-linked polyethylene (a specialized plastic) or ceramic for the surfaces that rub together.
Surgeons like Dr. Calendine use preoperative planning and, in many cases, robotic-arm assistance to measure your bone structure. This ensures the correct size and alignment of the components, which is crucial for leg length equality and joint stability.
No. Once the bone has grown into the specialized coating of the implants and the surrounding soft tissues have healed, most patients do not feel the presence of the prosthetic. The goal of the surgery is to eliminate the “grinding” sensation of arthritis so the joint feels natural and fluid.
Thanks to advancements in material science, modern hip implants are incredibly durable. While longevity varies based on activity level and age, many contemporary hip replacements are expected to last 20 to 25 years or more for the vast majority of patients.
Dr. Cory Calendine, MD, board-certified orthopedic surgeon specializing in hip and knee replacement at the Bone and Joint Institute of Tennessee in Franklin, TN, shown in a gray suit with glasses and a blue tie during a professional portrait session.

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About Cory Calendine, MD

Dr. Cory Calendine is a board-certified, fellowship-trained orthopedic surgeon specializing in hip and knee replacement at the Bone and Joint Institute of Tennessee in Franklin, TN. He performs more than 700 hip and knee replacement procedures annually and serves as a consultant to Stryker for the Mako® robotic platform.

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