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Introduction <p>Whether iliofemoral ligament-preserving hip arthroscopy facilitates recovery of gait speed—an indicator of functional recovery following hip arthroscopy in patients with femoroacetabular impingement—remains unclear. We investigated whether gait speed improved after iliofemoral ligament-preserving hip arthroscopy and examined whether pelvic jerk, defined as the time derivative of acceleration and assessed using inertial sensors at 1 month postoperatively (1M), was associated with gait speed at 6 months (6M).</p> Materials and methods <p>Eighteen patients who underwent primary hip arthroscopy for femoroacetabular impingement were included. Gait speed and pelvic jerk were assessed during a 10-m walk at a self-selected speed, using an inertial sensor positioned at the third lumbar level. Peak pelvic jerks during the 1st and 2nd halves of the stance phase (1st - and 2nd -peak pelvic jerks) were calculated. Measurements were obtained preoperatively and at 1M and 6M. Gait parameters were compared across time points using a linear mixed model. Bayesian regression was used to compare the observed change in gait speed from preoperatively to 6M with previously reported values. Associations between gait variables at 1M and gait speed at 6M were also examined.</p> Results <p>Gait speed was significantly higher at 6M than that pre surgery (preoperative, 1.15 [95% confidence interval, 1.08–1.21] m/s, 6M, 1.24 [95% confidence interval, 1.17–1.30] m/s, <i>P</i> = 0.013). Bayesian analysis indicated that the improved gait speed (posterior mean, 0.09&#xa0;m/s; 95% credible interval, 0.04–0.14) was comparable with previously reported values. The 2nd -peak pelvic jerk at 1M was significantly associated with gait speed at 6M (β = 0.63, <i>P</i> = 0.02).</p> Conclusions <p>Iliofemoral ligament-preserving hip arthroscopy was associated with a significant improvement in gait speed at 6M. Early postoperative gait kinematics during the latter half of the stance phase, reflected by the 2nd -peak pelvic jerk, may be associated with subsequent gait speed recovery.</p>

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Gait speed recovery after iliofemoral ligament-preserving hip arthroscopy for femoroacetabular impingement: associations with early postoperative gait kinematics

  • 期刊论文

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  • 发表日期：

    2026年7月3日

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  • Satoshi Machida,
  • Masahiro Tsutsumi,
  • Hajime Utsunomiya,
  • Shintarou Kudo

摘要

Introduction

Whether iliofemoral ligament-preserving hip arthroscopy facilitates recovery of gait speed—an indicator of functional recovery following hip arthroscopy in patients with femoroacetabular impingement—remains unclear. We investigated whether gait speed improved after iliofemoral ligament-preserving hip arthroscopy and examined whether pelvic jerk, defined as the time derivative of acceleration and assessed using inertial sensors at 1 month postoperatively (1M), was associated with gait speed at 6 months (6M).

Materials and methods

Eighteen patients who underwent primary hip arthroscopy for femoroacetabular impingement were included. Gait speed and pelvic jerk were assessed during a 10-m walk at a self-selected speed, using an inertial sensor positioned at the third lumbar level. Peak pelvic jerks during the 1st and 2nd halves of the stance phase (1st - and 2nd -peak pelvic jerks) were calculated. Measurements were obtained preoperatively and at 1M and 6M. Gait parameters were compared across time points using a linear mixed model. Bayesian regression was used to compare the observed change in gait speed from preoperatively to 6M with previously reported values. Associations between gait variables at 1M and gait speed at 6M were also examined.

Results

Gait speed was significantly higher at 6M than that pre surgery (preoperative, 1.15 [95% confidence interval, 1.08–1.21] m/s, 6M, 1.24 [95% confidence interval, 1.17–1.30] m/s, P = 0.013). Bayesian analysis indicated that the improved gait speed (posterior mean, 0.09 m/s; 95% credible interval, 0.04–0.14) was comparable with previously reported values. The 2nd -peak pelvic jerk at 1M was significantly associated with gait speed at 6M (β = 0.63, P = 0.02).

Conclusions

Iliofemoral ligament-preserving hip arthroscopy was associated with a significant improvement in gait speed at 6M. Early postoperative gait kinematics during the latter half of the stance phase, reflected by the 2nd -peak pelvic jerk, may be associated with subsequent gait speed recovery.