Hip resurfacing is often seen as a modern alternative to the more conventional total hip replacement, but new data from a study led by Rush University Medical Center in Chicago, USA, suggest that a patient’s age and gender are key to the operation’s success. The study will be published in the December issue of the Springer journal Clinical Orthopaedics and Related Research.
In a review of over 500 surgeries performed in the United States using a hip resurfacing device recently approved by the Food and Drug Administration (FDA), the researchers found that the majority of serious complications occurred in women of all ages and men over the age of 55. The most common complication, and the most serious, was a fracture of the femoral neck, the slender area of bone just beneath the head of the femur.
In hip resurfacing, the femoral head remains, but its surface is reshaped to accept a rounded cap with a short stem that sits in the femur. A thin metal cup is pressed into the hip socket. Both components are made entirely of cobalt chrome, a metal.
“The ideal patients for hip resurfacing are males under the age of 55. They have the fewest, and the least serious, complications,” said Dr. Craig Della Valle, lead author and a specialist in joint reconstruction. “Patients may be eager to take advantage of technological innovations, but for older individuals, a conventional hip replacement is generally more appropriate.”
The researchers analyzed data for the first 537 hip resurfacing surgeries performed in the United States after the Birmingham Hip Resurfacing implant, manufactured by Smith & Nephew, was approved by the FDA in October 2006. The majority of the patients suffered from severe osteoarthritis. All 89 orthopedic surgeons involved in the procedures had undergone training required by the FDA before conducting their first cases. Their level of experience with hip surgery varied. Some were joint replacement specialists; others were general orthopedic surgeons.
Serious complications occurred in 32 of the 537 cases, including 10 cases in which the femoral neck fractured after surgery, a problem not seen with conventional hip replacements. Such fractures require additional surgery. Nine of the fractures in the study occurred in patients who were either female or older than 55 at the time of the implant. Eight of the fractures occurred when the surgeon was relatively inexperienced with the procedure (within the surgeon’s first 10 cases).
“Patients who are older or who are female tend to have softer bone,” Della Valle said. “Also, men on average have larger bone structures, with a greater surface area for securing the implant.”
Hip resurfacing is generally recommended for younger, more active patients out of concern that the traditional artificial hip might wear out during their lifetime and require a second replacement, a far more complicated surgery.
“Hip resurfacing has certain advantages over the conventional total hip replacement,” said Della Valle. “It preserves more bone because the head of the femur is retained. But despite its benefits, risks remain. Our findings suggest that we need to be cautious. This procedure is not ideal for everyone.”
Renate Bayaz | alfa
Climate change and air pollution damaging health and causing millions of premature deaths
30.11.2018 | International Institute for Applied Systems Analysis (IIASA)
Reading rats’ minds
29.11.2018 | Institute of Science and Technology Austria
What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.
Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...
Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.
Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...
New Project SNAPSTER: Novel luminescent materials by encapsulating phosphorescent metal clusters with organic liquid crystals
Nowadays energy conversion in lighting and optoelectronic devices requires the use of rare earth oxides.
Scientists have discovered the first synthetic material that becomes thicker - at the molecular level - as it is stretched.
Researchers led by Dr Devesh Mistry from the University of Leeds discovered a new non-porous material that has unique and inherent "auxetic" stretching...
Scientists from the Theory Department of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science (CFEL) in Hamburg have shown through theoretical calculations and computer simulations that the force between electrons and lattice distortions in an atomically thin two-dimensional superconductor can be controlled with virtual photons. This could aid the development of new superconductors for energy-saving devices and many other technical applications.
The vacuum is not empty. It may sound like magic to laypeople but it has occupied physicists since the birth of quantum mechanics.
10.12.2018 | Event News
06.12.2018 | Event News
03.12.2018 | Event News
10.12.2018 | Life Sciences
10.12.2018 | Physics and Astronomy
10.12.2018 | Life Sciences