Nonarthritic hip score among seven prognosticators of hip arthroscopy outcomes
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Data presented at the American Orthopaedic Society for Sports Medicine Annual Meeting showed lateral joint space and preoperative nonarthritic hip score were prognosticators of improved 2- and 5-year hip arthroscopy outcomes.
In all, researchers identified seven predictors of hip arthroscopy patient-reported outcome (PRO) measures, which were age, BMI, acetabular microfracture, revision hip arthroscopy, lateral joint space, alpha angle and preoperative nonarthritic hip score (NAHS).
Ajay C. Lall, MD, MS, and colleagues prospectively studied 1,038 patients who underwent primary or revision hip arthroscopy between 2008 and 2012 to determine the preoperative and intraoperative factors associated with the best and worst PRO measures. Researchers used the NAHS and the modified Harris Hip Score (mHHS) to assess potential predictors of PROs from among the 36 continuous and categorical variables they identified.
Researchers performed bivariable and multivariable analyses of all the variables.
At a mean follow-up of 62 months, with 80% follow-up of patients in the study, researchers found a mean improvement at 5-year follow-up in all the PROs they measured, according to Lall.
At the meeting, which was held virtually, Lall said, “We had a significant improvement of VAS” for the entire cohort.
Researchers’ multivariate analysis showed having an acute injury and undergoing iliopsoas fractional lengthening were among the predictors of the mHHS, according to the results.
“Age, BMI, revision status [and] acetabular microfracture were noted to be negative predictors, whereas preoperative nonarthritic hip score and lateral joint space were found to be positive predictors,” Lall said.
Lall told Healio Orthopedics, “This study from the American Hip Institute & Orthopedic Specialists reports favorable 5-year clinical outcomes in the largest cohort of hip arthroscopies in the literature to date and identifies seven variables as significant predictors of these outcomes: preoperative NAHS, body mass index, age, lateral joint space, alpha angle, revision hip arthroscopy and acetabular microfracture. Of these, preoperative NAHS, BMI, age and revision hip arthroscopy were predictive of both 2- and 5-year postoperative NAHS in this cohort of 1,038 patients, findings which may prove useful to clinicians in determining indications for hip arthroscopy and counseling patients on its expected outcomes.”
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Lall AJ, et al. Podium presentation 55. Presented at: American Orthopaedic Society for Sports Medicine Annual Meeting; July 8-9, 2020 (virtual meeting).
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