Spinal Deformity Ups Risk Involved With Hip Replacement Surgery

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Spinal deformity is caused due to unnatural curvature and it takes place mostly due to any defect, or damage caused to the spine.

Patients who are suffering from spinal deformity are at greater risk of dislocation following a hip replacement surgery if a new study is to be believed.

The study was conducted by orthopedic surgeons of the NYU Langone Medical Center. The research includes a detailed observation of the affects of spinal deformity on the pelvis. It states the risks which are involved in such cases, while surgeons try to attach the artificial hip during a replacement surgery.

The Research

During a hip replacement surgery, the surgeon attaches an artificial joint which includes a socket and a ball to the natural sockets located in the pelvis of the patient. Surgeons have tried to attach the socket or the acetabular cup adjoining the pelvic bone, which according to them is a safe zone or is a place where there are less chances of dislocation.

This process has been used by surgeons for years. However, a new study suggests that attaching the artificial cup at the safe area is not sufficient to avoid dislocations in patients suffering from deformity.

During the research, the investigators studied 107 patients who had been affected with sagittal spinal deformity. They also reviewed 139 patients who had undergone a hip replacement surgery.

The detailed report of the measurements of the patients taken before and after the surgery were analyzed. The researchers studied the dynamic changes which took place in the acetabular cup position, and also inquired the instability rate in the patients who underwent hip replacement surgery.

Results Of The Research

The investigators found that the dislocation rate is 8 percent for patients who are suffering from some kind of spinal stenosis. About 5.8 percent patients required another operation because of the reoccurrence of the dislocation.

“The fact that high rates of dislocation occurred in patients with ‘safe zone’ placement of their artificial hips implies that our understanding of what defines acceptable acetabular positioning for these patients remains questionable,” said Jonathan Vigdorchik, Assistant Professor of Orthopedic Surgery in NYU Langone.

These findings have led orthopedic surgeons at NYU Langone to work together with other spine surgeons. They intend to work on planning preoperative measures, which should be taken to achieve the best possible results for hip replacement surgeries.

The researchers are also planning to examine ways through which further dislocation risks, that are involved in hip replacement surgeries, can be reduced.

This research was presented at the at the American Academy of Orthopedic Surgeons (AAOS) 2017 Annual Meeting in San Diego, California on March 17.

The study is available online in the Journal of Arthroplasty.

Photo: Zdenko Zivkovic | Flickr

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