Patients who received a new artificial implant known as a 'dual mobility' hip replacement had zero dislocations, reports a new study. The findings of the study are presented at the American Association of Hip and Knee Surgeons. Hip replacement surgery is highly successful in relieving pain, restoring mobility and improving quality of life. More than 330,000 procedures are performed each year in the United States, and that number is expected to almost double by the year 2030.
‘Dual-mobility hip components provide an extra bearing surface, improving the range of movement and minimizing the risk of dislocation in patients who need revision surgery.’
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As with all surgical procedures, the possibility of a complication exists, and dislocation is the most common problem. The risk of dislocation is higher in patients who have had a second hip replacement, known as revision surgery. Some people need revision surgery many years after their first hip replacement when the original implant wears out. Hip instability after joint replacement is another reason a patient might need a revision surgery.Read More..
Research conducted by Dr. Geoffrey Westrich and colleagues at Hospital for Special Surgery and other joint replacement centers indicates that a newer type of artificial hip known as a "modular dual mobility" implant could be a good option for patients who need revision surgery.
"Although the concept of dual mobility was originally developed in France in the 1970s, the technology is relatively new in the United States," says Dr. Westrich, director of research of the Adult Reconstruction and Joint Replacement Service at HSS. "Our study found that the newer technology with modular dual mobility components offered increased stability, lowering the risk of dislocation, without compromising hip range of motion in patients having revision surgery."
"Dual mobility" refers to the bearing surface of the implant - where the joint surfaces come together to support one's body weight. A hip replacement implant is a ball-in-socket mechanism, designed to simulate a human hip joint. Typical components include a stem that inserts into the femur (thigh bone), a ball that replaces the round head of the thigh bone, and a shell that lines the hip socket.
Modular dual mobility implants provide an additional bearing surface compared to a traditional implant. With the dual mobility hip, a large polyethylene plastic head fits inside a polished metal hip socket component, and an additional smaller metal or ceramic head is snap-fit within the polyethylene head.
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The study included 370 patients who underwent revision hip replacement with the dual mobility implant between April 2011 and April 2017. The average patient age at the time of surgery was 65.8 years. Clinical, radiographic and patient reported-outcome information was collected.
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Source-Eurekalert