Between 5 and 30 per cent of those who receive a new hip prosthesis will require a re-operation during their lifetime. New research shows that a high-resolution X-ray method can predict which patients have the greatest risk of re-operation.
In Sweden, around 16,000 hip prosthesis operations are done annually, and about an additional 1,100 re-operations are done where part or all of the prosthetic must be replaced or removed.
Maziar Mohaddes, MD, PhD, University of Gothenburg
University of Gothenburg
Varies with age
The risk of re-operation varies with the patient’s age: around 30 per cent of patients under 50 undergo a re-operation within 15 years, while the corresponding percentage for patients older than 75 is 5-10 per cent.
The risk of re-operations also increases after each new operation on the hip joint.
Over 30 years, researchers at Sahlgrenska Academy at the University of Gothenburg have developed a special examination method that makes it possible to measure the prosthesis movement relative to the bone using high-resolution X-rays (called radiostereometry). The method, which has now been evaluated in a doctoral thesis, can be used to predict which patients are at risk of re-operation.
“With the radiostereometric method, we can discover movements in the artificial joint socket. Since these movements increase the risk that the prosthesis will loosen on the long term, the information can be used to predict re-operation,” says Maziar Mohaddes, who is presenting the studies in his doctoral thesis.
Improves the outcome
According to the researchers, the radiostereometric method can predict at an early stage if new prosthetic models and surgical techniques are safe, and if they can be expected to improve the outcome in patients.
The technique in question is so specialised that it is primarily used in research.
According to Maziar Mohaddes, broader clinical use could both identify and to some extent reduce the scope of complications in hip operations.
The doctoral thesis, which in part builds on data from the Swedish Hip Arthroplasty Register, was defended on October 2nd 2015.
Link to thesis: https://gupea.ub.gu.se/handle/2077/39540
HIP PROSTHETIC FACTS
A hip prosthesis consists of two parts: one that replaces the joint socket (the cavity on the outside of the hip bone) and one that replaces the hip joint’s femoral part. In Sweden, the parts are usually attached to the bone with the help of bone cement. But the technique is considered to be both demanding and to increase the risk of loosening, and uncemented implants are increasingly being used in Sweden and internationally.
A relatively new type of prosthesis made of the metal tantalum has demonstrated better results in scientific studies than the traditional uncemented prosthesis models.
Maziar Mohaddes, MD, PhD, Sahlgrenska Academy, University of Gothenburg
+46-736 665 818
Henrik Axlid | idw - Informationsdienst Wissenschaft
Gentle sensors for diagnosing brain disorders
29.09.2016 | King Abdullah University of Science and Technology
New imaging technique in Alzheimer’s disease - opens up possibilities for new drug development
28.09.2016 | Lund University
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
27.10.2016 | Materials Sciences
27.10.2016 | Physics and Astronomy
27.10.2016 | Life Sciences