Outcome of hip resurfacing may be dependent on experience
By Gina Brockenbrough
1st on the web (February 27, 2009)
LAS VEGAS — A new study links outcomes of hip resurfacing to the hospital volume of resurfacing cases and, thereby, the surgeon’s experience.
To evaluate the impact of operative volume on hip resurfacing outcomes, Andrew J. Shimmin, MD, and colleagues used the Australian Joint Registry to identify nearly 9,000 hip resurfacings performed at 196 hospitals between September 1999 and December 2006. The investigators used revision as an endpoint for survivorship.
They found that 74% of hospitals performed fewer than 30 procedures during the 7-year study period, while 64% of hip resurfacings were performed at 16 “high-volume” hospitals, or those that performed more than 100 cases. Overall, the researchers found that 3.1% of resurfacings were revised.
The investigators categorized the hospitals into the following four groups according to their volume of cases performed during the study period:
- fewer than 25 cases;
- 25-49 cases;
- 50-100 cases; and,
- more than 100 cases.
They then compared the cumulative rate of revision at 4 years among the hospital groups.
At 4 years, the investigators discovered a 6% revision rate for centers performing fewer than 25 cases, a 5.6% rate for those performing 25-49 cases, a 4.7% rate for hospitals doing 50-99 cases, and a 2.7% revision rate for those performing more than 100 cases. After adjusting for patient age and gender, the investigators discovered that the risk for revision was 66% greater in hospitals performing the least amount of cases.
“In this study, hospital volume is primarily a reflection of the operative experience of the individual surgeons,” Shimmin said at the American Academy of Orthopaedic Surgeons 76th Annual Meeting, here.
“The outcome of hip resurfacing is strongly dependent on the experience of the surgeon and hospital performing the procedure. Even when adjusted for age and sex of the patients, the risk of revision at low-volume centers was 66% greater than a higher volume center, and this supports the need for increased training of surgeons before undertaking hip resurfacing,” he said.
Reference:
- Shimmin AJ. The effect of operative volume on the outcome of hip resurfacing. Paper #316. Presented at the American Academy of Orthopaedic Surgeons 76th Annual Meeting. Feb. 25-28, 2009. Las Vegas.
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