Failure of revision hip arthroscopy associated with changes in alpha angle
Click Here to Manage Email Alerts
Radiographic factors, such as preoperative to postoperative changes in alpha angle, anterior offset and head-neck ratio, were associated with failure of revision hip arthroscopy, according to published results.
Researchers from NYU Langone Health Orthopedics analyzed the results of 26 patients who underwent revision hip arthroscopy (RHA) with a minimum 2-year follow-up from January 2007 to December 2017. Failure of RHA was defined as reoperation on the operative hip or a modified Harris hip score of less than 70 at 1 year after surgery. Additionally, outcomes were defined by change from preoperative to postoperative alpha angle between the eight patients (31%) who had failed RHA and the 18 patients (69%) who had successful RHA.
Change in alpha angle, anterior offset and head-neck ratio were “significantly associated” with RHA failure, the researchers wrote in the study. Overall, the failure RHA cohort had a larger postoperative alpha angle (54.2°) – as measured on the Dunn 45° view – compared with the successful RHA cohort (48.2°). The failure RHA cohort also had a smaller, “statistically significant” difference in alpha angle compared with the successful RHA cohort (-6.1° vs. -14.7°, respectively).
Researchers concluded that each 1° increase in preoperative to postoperative alpha angle was associated with a 17% decrease in the odds of failure.
“Complete resection of cam lesions as determined by changes in alpha angle, anterior offset and head-neck ratio when measured on the Dunn 45° view correlates with positive clinical outcomes after RHA,” the researchers wrote.
They added, “These results are clinically valuable given that hip arthroscopy (both primary and revision) has become an increasingly popular procedure, with a significant increase in utilization across the United States over the past decade.”
Collapse
Read more about
Click Here to Manage Email Alerts