Today's News

Thursday, March 1, 2001

HipNav gives precision to less invasive THR

The use of HipNav, a surgical navigation system, has assisted in the development of a less invasive surgical technique for total hip replacement, say researchers in scientific exhibit 58. They observe that current techniques for total hip replacement require extensive soft tissue dissection to accurately prepare the bone and to insert the implants. Although recently there have been efforts to reduce the size and extent of the surgical approach, there is a risk that less invasive techniques could result in less accurate surgery.

"The challenge to surgeons is to achieve the surgical goal precisely and accurately while minimizing the soft tissue disruption," said Anthony M. DiGioia III, MD, Centers for Medical Robotics and Computer Assisted Surgery, Pittsburgh, Pa.

The mini-incision is situated more proximally compared to a traditional posterolateral approach and can be used as a mobile window to permit visualization of the deeper tissues and bone. HipNav provides additional navigational and alignment guidance without the surgeon necessarily having to visualize extensive bony landmarks. He notes that although this technology is not required to develop a mini-incision approach, it enables more accurate and less invasive approaches to these joint reconstruction procedures.

The study involved 100 total hip replacement patients operated on with the help of the HipNav systems - a total of 108 total hip replacement surgeries. There were 51 females and 49 males enrolled with a mean age of 62.6 years and a range of 37 to 81 years. A reduction in incision length and soft tissue dissection averaged 50 percent, compared to traditional total hip replacement techniques was 50 percent. The mean mini-incision size was 12.2 cm (range from 7.3 mm to 20.6 cm).

In addition to Dr. DiGioia, other researchers are James E. Moody, MS; Timothy J. Levison, MS; and Branislav Jaramaz, PhD, all from the Centers for Medical Robotics and Computer Assisted Surgery, Pittsburgh, Pa.

Funding was provided by Carnegie Mellon University and Shadyside Hospital.

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2001 Academy News March 1 Index B

Last modified 20/February/2001 by IS