LESS is More: Presenting a Novel Motion Analysis to Evaluate Progression following Hip Arthroscopy
2Orthopedics, American Hip Institute, USA
Purpose:
(1) to establish an objective measure of postoperative physical performance following hip arthroscopy using a markerless motion-capture system to analyze the Landing Error Scoring System (LESS) and (2) to validate the postoperative LESS test by evaluating its correlation with postoperative PROs.
Methods:
Data were prospectively collected and retrospectively analyzed for patients who underwent hip arthroscopy from October 2017 to December 2019. Inclusion criteria were patients having undergone hip arthroscopy with minimum 1-year follow-up, pre- and postoperative PROs, and postoperative LESS. Participants successfully completed three trials of a jump-landing movement assessment. The LESS data and 3-dimensional motion analysis were collected simultaneously during the jump-landing task. The LESS score is a summation of landing technique “errors,” using a range of readily observable aspects of human movement. This LESS score was examined for possible correlations with preoperative and postoperative PROs.
Results:
Of the reported PROs, preoperative, 3-month and 1-year postoperative mHHS, NAHS, VAS, and VR-P demonstrated a significant correlation with postoperative LESS scores. Preoperative HOS-SSS, iHOT and SF-P, as well as 3-month postoperative iHOT and 1-year postoperative SF-P, demonstrated a significant correlation with postoperative LESS. No significant correlation was found between LESS scores and 3-month or 1-year postoperative HOS-SSS, 1-year postoperative iHOT or 3-month postoperative SF-P. No correlation was found between SF-M or VR-M and postoperative LESS scores at any study time points.
Conclusion:
LESS, analyzed by a markerless motion capture system, may correlate with pre-, 3-month and 1-year PROs following hip arthroscopy. Pure mental questionnaires do not show significant correlation between the two assessment tools.