Background

Patellofemoral pain has a poor long-term prognosis, which can be explained by a pain sensitization process. The pain sensitization process may be related to the increase of stress in the patellofemoral joint that is already associated with kinematic alterations and weakness in the musculature of the hip and knee.

Methods

Were compared the pressure pain threshold, temporal summation, conditioned pain modulation, angular kinematics, and muscle strength between 26 patellofemoral pain and 24 asymptomatic women and then correlated pain sensitization variables with biomechanical variables in pain group. The pressure pain threshold was determined on seven points of the knee, tibialis anterior muscle, and elbow. Ten consecutive stimuli were performed for temporal summation, and cold water was used as the conditioning stimulus for conditioned pain modulation. The strength of hip and knee muscles was determined using a manual dynamometer. Three-dimensional kinematics were evaluated during the lateral step down, considering peak and excursion values of the movement and the Movement Deviation Profile.

Findings

The pressure pain threshold of the elbow (2.13 [1.84–2.41] vs. 1.63 [1.25–2] kg/cm²), all sites of the knee were lower, as well as the Movement Deviation Profile was higher (9.33 [9.20–9.46] vs. 12.43 [12.1–12.75]) in the pain group. No difference in temporal summation, conditioned pain modulation, muscle strength and discrete kinematic values were found. No significant correlation was found between the Movement Deviation Profile and pressure pain threshold.

Interpretation

Biomechanical factors, pain processing, and modulation in women with patellofemoral pain, when different from asymptomatic individuals, are not necessarily associated.

中文翻译：

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tell股股骨疼痛妇女的疼痛敏感性与肌力和运动角度的相关性

背景

ello股骨疼痛的长期预后较差，这可以通过疼痛致敏过程来解释。疼痛致敏过程可能与the股关节的压力增加有关，而of股关节的压力已经与运动学改变和臀部和膝盖的肌肉组织无力相关。

方法

比较了26例tell股疼痛和24例无症状女性之间的压力疼痛阈值，时间总和，条件性疼痛调节，角运动学和肌肉力量，然后将疼痛敏锐度变量与疼痛组中的生物力学变量相关联。确定膝盖，胫骨前肌和肘部七个点的压力疼痛阈值。进行十次连续刺激以进行时间总和，并使用冷水作为条件刺激来调节条件性疼痛。使用手动测力计确定髋和膝部肌肉的强度。考虑到运动的峰值和偏移值以及运动偏差曲线，在横向下降过程中评估了三维运动学。

发现

肘部的压力痛阈值（2.13 [1.84–2.41] vs. 1.63 [1.25–2] kg / cm ²），膝盖的所有部位均较低，并且运动偏差曲线较高（9.33 [9.20– 9.46] vs. 12.43 [12.1-12.75]）。在时间总和，条件性疼痛调节，肌肉力量和离散运动学值上均无差异。在运动偏差曲线和压力疼痛阈值之间未发现显着相关性。

解释

当与无症状个体不同时，pa股股骨疼痛妇女的生物力学因素，疼痛处理和调节作用不一定。