A new type of hip replacement implant could make recovery much safer for thousands of patients by reducing the risk of painful hip dislocation after surgery by nearly 70%, according to a major international study published in The Lancet.

Hip replacement surgery is one of the most common procedures for people suffering from severe arthritis, fractures and chronic hip pain. While the surgery often restores mobility and relieves pain, one of the biggest concerns after the operation is the artificial hip slipping out of place, a complication known as hip dislocation. This can cause intense pain and often requires emergency treatment or even another surgery.

Researchers from Sweden and the United Kingdom found that a specially designed "dual mobility" hip implant significantly reduced this risk. The study involved more than 1,600 patients aged 65 years and above who had undergone hip replacement surgery following a fractured hip.

The innovative implant features a small metal or ceramic ball enclosed within a larger plastic ball that fits into the metal socket. This design allows the joint to move more freely while providing greater stability, making it much less likely to dislocate during everyday movements.

After one year, only 1.3% of patients who received the dual mobility implant experienced a hip dislocation, compared to 4.2% of those fitted with the conventional implant. Researchers said this translates to a 70% lower risk of dislocation. The study also found that patients receiving the new implant experienced fewer overall surgical complications.

Lead researcher Dr. Nils Hailer, an orthopaedic surgeon at Uppsala University Hospital in Sweden, said hip dislocation after surgery is extremely painful and can seriously affect a patient's confidence in their new joint. He noted that preventing this complication could greatly improve quality of life after surgery.

Although dual mobility implants are more expensive than standard implants, researchers believe the higher initial cost may be balanced by fewer complications, reduced need for repeat surgeries and lower healthcare expenses in the long run. A detailed cost-effectiveness analysis is currently underway.

Professor Xavier Griffin of Queen Mary University of London said one of the biggest advantages of the new implant is that it does not require new technology or additional training for surgeons. Since orthopaedic surgeons are already familiar with the implant, it could be introduced into routine clinical practice without delay.

The researchers believe the findings could help improve outcomes for older patients undergoing hip replacement surgery and may influence future treatment guidelines worldwide.