Study finds ‘true cumulative incidence’ of hip dislocation after THA to be 3.5%
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According to recently published results, the “true cumulative incidence” of hip dislocation, including revisions and closed reductions, after primary total hip arthroplasty is 3.5%, a 50% increase compared with register-coded dislocations.
A group of researchers from Denmark used the Danish Hip Arthroplasty Register to identify 31,105 primary THAs from 2010 to 2014 with at least 2 years of follow-up. Additionally, they identified dislocations and matched diagnoses with procedure codes using the Danish National Patient Register and performed multiple logistic regression analysis to analyze risk factors.
The review of patient files revealed 1,861 dislocations in 1,079 THAs, corresponding to a 2-year cumulative incidence of 3.5%, “a 50% increase compared with the correctly coded dislocations captured by administrative register data only,” the researchers wrote in the study.
Patients who were older, female, had a higher American Society of Anesthesiologists score, received fixation without cement and the posterior surgical approach were at increased risk of dislocation, the researchers also noted.
“Our study emphasizes the need for caution in interpreting results based on registers alone, as 50% more dislocations were found when we reviewed alternative codes in patient les,” they added. “We believe that there is a need for better algorithms for identifying all dislocations before this complication can be reported and monitored truthfully in a national register.”
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