Dynamic joint stiffness in individuals with femoroacetabular impingement syndrome pre- and post-hip arthroscopy.

Clin Biomech (Bristol)

Sports Medicine Research Institute, The Ohio State University Wexner Medical Center, 2835 Fred Taylor Dr, Columbus, OH 43202, USA; Division of Physical Therapy, School of Health and Rehabilitation Sciences, The Ohio State University, 453 W 10th Ave, Columbus, OH 43210, USA.

Published: February 2024

AI Article Synopsis

  • - Patients with hip pain often struggle to regain their activity levels after hip arthroscopy, potentially due to changes in how their joints manage movement, particularly during high-impact activities.
  • - A study involving 25 participants with hip pain and 19 healthy controls measured dynamic joint stiffness during drop jumps before and six months after surgery, highlighting differences in stiffness changes between genders.
  • - Findings revealed that females had decreased ankle stiffness while males showed increased hip stiffness after surgery, suggesting that rehabilitation approaches may need to be sex-specific to enhance recovery and optimize return to activity.

Article Abstract

Background: Patients with hip-related pain often fail to return to their desired level of activity following hip arthroscopy. Lasting biomechanics alterations may be one potential explanation. Dynamic joint stiffness assesses the mechanistic controls of the lower limb during high impact movements, and thus, may provide valuable clinical targets to improving movement and optimizing return to activity after surgery.

Methods: Twenty-five participants (13 females) with hip-related pain underwent 3D motion capture during a drop jump task before surgery and six months post-operatively. Nineteen healthy controls (9 females) were collected for comparison. Sagittal plane dynamic joint stiffness was calculated during the initial landing phase. Baseline and 6-month dynamic joint stiffness data were compared 1) between males and females with hip-related pain and 2) between individuals with hip-related pain and controls using Wilcoxon Signed-Rank and Mann Whitney U tests. Sexes were analyzed separately.

Findings: From baseline to 6 months post-operatively, females with hip-related pain demonstrated decreased dynamic ankle stiffness (2.26 Nm/deg. [0.61] to 1.84 Nm/deg. [0.43]) (p = .005) and males with hip-related pain demonstrated increased dynamic hip stiffness (2.73 [0.90] to 3.88 [1.73]) (p = .013). There were no differences in dynamic stiffness at any joint between individuals with hip-related pain at either timepoint when compared to controls (p ≥ .099).

Interpretation: Females and males with hip-related pain may demonstrate unique changes in dynamic joint stiffness after surgery, indicating return to activity may follow different trajectories for each sex. Additional work should examine the relationship between hip joint stiffness and treatment outcomes and identify additional movement-related rehabilitation targets.

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Source
http://dx.doi.org/10.1016/j.clinbiomech.2024.106187DOI Listing

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