New Type of Artificial Hip Could Reduce Risk of Dislocation


Researchers in the US have found that a newer type of artificial hip could reduce the risk of the hip becoming dislocated after surgery, particularly in patients who need a second hip replacement.

The type of artificial hip is called a ‘modular dual mobility’ implant.

Worn hip joint

There are over 70,000 hip replacement operations carried out in England and Wales each year. Most are carried out on people between the ages of 60 and 80, although the number of operations on people younger than 60 is increasing.

Hip replacement surgery is usually needed when a person’s hip joint becomes worn or damaged, either through wear and tear, or a condition such as osteoarthritis.

Dislocation of hip joint

One of the risks of hip replacement surgery is dislocation. This is where the hip joint comes out of is socket. It can require another operation to relocate the hip joint.

The risk of dislocation is higher in people who have had to have a second hip replacement (known as ‘revision surgery’) because the original implant has worn out or the hip is unstable. About one in 10 hip replacements need a second operation. However, the risk of dislocation following a second operation is higher than following the first operation.

Modular dual mobility

Researchers from the Hospital for Special Surgery in the US have analysed the impact of using a new type of artificial hip, called a ‘modular dual mobility’ implant.

They studied 370 patients who had revision hip replacement surgery using the modular dual mobility implant between 2011 and 2017. Patients were followed up for at least two years after surgery.

They found that these patients had a very low rate of hip dislocation and instability (2.9%), compared to the usual rate seen after revision surgery. There was also a low number of people who needed another operation.

New technology

Dr Westrich, one of the researchers, said: “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 a revision surgery.

“While longer-term follow-up is needed to fully assess the newer device, in our study there was clearly a benefit provided by the dual mobility implant in the first few years following revision surgery.”


This article was written by a third party source and does not reflect the views or opinions of Ramsay Health Care unless explicitly stated.

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