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. 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 tests. Sexes were analyzed separately. 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]) ( = .005) and males with hip-related pain demonstrated increased dynamic hip stiffness (2.73 [0.90] to 3.88 [1.73]) ( = .013). There were no differences in dynamic stiffness at any joint between individuals with hip-related pain at either timepoint when compared to controls ( ≥ .099). 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.

中文翻译：

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髋关节镜检查前后股骨髋臼撞击综合征患者的动态关节僵硬

患有髋部相关疼痛的患者在髋关节镜手术后通常无法恢复到所需的活动水平。持久的生物力学改变可能是一种潜在的解释。动态关节刚度评估高冲击运动期间下肢的机械控制，因此可以为改善运动和优化术后恢复活动提供有价值的临床目标。25 名患有髋部相关疼痛的参与者（13 名女性）在手术前和术后六个月的跳伞任务中接受了 3D 动作捕捉。收集十九名健康对照者（九名女性）进行比较。在初始着陆阶段计算矢状面动态关节刚度。使用 Wilcoxon Signed-Rank 和 Mann Whitney 检验对 1) 患有髋部相关疼痛的男性和女性之间以及 2) 患有髋部相关疼痛的个体和对照组之间的基线和 6 个月动态关节刚度数据进行比较。性别分别进行分析。从基线到术后 6 个月，患有髋部相关疼痛的女性表现出动态踝关节僵硬度下降（2.26 Nm/deg. [0.61] 至 1.84 Nm/deg. [0.43]）( = .005)，而患有髋部相关疼痛的男性则表现出动态踝关节僵硬度降低。疼痛表明动态髋部僵硬增加（2.73 [0.90] 至 3.88 [1.73]）（= .013）。与对照组相比，在任一时间点患有髋部相关疼痛的个体的任何关节的动态刚度均无差异 (≥ .099)。患有髋部相关疼痛的女性和男性在手术后可能会表现出动态关节僵硬的独特变化，这表明每种性别恢复活动的轨迹可能不同。额外的工作应该检查髋关节僵硬和治疗结果之间的关系，并确定其他与运动相关的康复目标。