Personalized Hip Replacement Clears FDA


LOS ANGELES, Calif. (Ivanhoe Newswire) — A hip replacement system recently approved by the FDA is helping surgeons find the best alignment for the prosthetics. The optimized position system, or OPS, starts weeks before surgery, with x-rays, CT scans, and 3D models.

Polio as a child left Barbara Abbott with legs of different lengths. But hip pain that flared up a few years ago has slowed this active 72-year-old. Even sitting to paint hurt.

“So I’m afraid at the point I might fall, because it’s like a hot pan, you have to drop it. When you step on it at that perfect angle, it’s just excruciating,” Abbott explained.

Before surgery with the OPS system, patients get x-rays of how the pelvis moves in three positions.

“Then, with the use of a CT scan of the pelvis, we can create this patient-specific block that exactly matches the bony morphology of the pelvis,” said Steven Barnett, MD, an Orthopedic Surgeon at Hoag Orthopedic Institute. (Read Full Interview)

Those images are used to make a hip analysis and a 3D model of Abbott’s hip. All this shows exactly where to put the socket and a guide block that’s aligned with a laser.

Dr. Barnett said, “When we actually put the implant in, we just match up our laser points so that we know we’ve repeated the exact angles that we planned for pre-operatively.”

The team takes x-rays during the procedure, too, to make sure everything lines up. Dr. Barnett says the OPS system adds a few minutes to the 45-minute surgery.

“Her arthritis pain will be gone this afternoon once the surgery is over, and she’ll be up walking,” Dr. Barnett shared.

“Since I’ll be walking right away, I hope to be right out here going as soon as I can and get back on my bike.” Abbott said.

And she can’t wait to keep up again with Dan, her husband of 52 years.

Less than a week after her surgery, Abbott is already walking her boardwalk and she has no pain. Dr. Barnett says this procedure can be used for anyone who needs a total hip replacement. More than 3,000 patients have had the procedure in Australia and Europe, where it was approved years ago.

Contributors to this news report include: Wendy Chioji, Field Producer; Rusty Reed, Videographer; Cyndy McGrath, Supervising Producer; Hayley Hudson, Assistant Producer; Roque Correa, Editor.

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REPORT:        MB #4427


BACKGROUND: A hip replacement can be done for a variety of reasons, such as osteoarthritis. Commonly known as wear-and-tear arthritis, osteoarthritis damages the slick cartilage that covers the ends of bones and helps joints move smoothly. Rheumatoid arthritis is caused by an overactive immune system and produces a type of inflammation that can erode cartilage and occasionally underlying bone, resulting in damaged and deformed joints. Another reason may be osteonecrosis, where there is inadequate blood supply to the ball portion of the hip joint, and the bone may collapse and deform. Other reasons someone might consider a hip replacement surgery is pain that persists despite pain medication, pain that worsens with walking, even with a cane or walker, pain that interferes with your sleep, affects your ability to go up or down stairs, or makes it difficult to rise from a seated position.



TREATMENT: During standard hip replacement surgery, the doctor will make a cut along the side of the hip and move the muscles connected to the top of the thighbone to expose the hip joint. Next, the ball portion of the joint is removed by cutting the thighbone with a saw. Then an artificial joint is attached to the thighbone using either cement or a special material that allows the remaining bone to attach to the new joint. The doctor then prepares the surface of the hipbone, removing any damaged cartilage, and attaches the replacement socket part to the hipbone. The new ball part of the thighbone is then inserted into the socket part of the hip. The doctor then reattaches the muscles and closes the incision.



NEW TECHNOLOGY: Every patient moves differently, and now surgeons can take this into account when performing hip replacement surgery, thanks to a new technology from the Corin Group that helps determine the best positioning of an implant and its components based on how patients really move during daily activities. Utilizing pre-operative functional simulation and planning and a unique intra-operative positioning system that employs 3D printing and laser guidance, OPS helps surgeons determine the best position and orientation for a hip implant based on specific patient anatomy and movement.  In the U.S., the first-ever functional, patient-specific hip replacement procedures using OPS were performed in November 2016, shortly after FDA clearance. More than 3,000 procedures have been done in Europe and Australia, where the system was previously approved for use.




James Chisum, Media Relations


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Doctor Q and A

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