Patellar tendinopathy is more prevalent in males versus female athletes and commonly presents in the medial region of the tendon. Separate measures of patellar tendon strain in the medial, central, and lateral regions of the tendon, however, have not been quantified. The purpose was to investigate the differences in tendon strain between the medial, lateral, and central regions of the patellar tendon in healthy men and women. Strain in the medial and lateral regions of the patellar tendon in healthy participants (10 males, 10 females) was evaluated using ultrasound during isometric quadriceps contractions at 20%, 40%, 60%, 80%, and 100% of maximum voluntary contraction (MVIC) in 60° and 90° of knee flexion. Central strain was also measured at 60% MVIC in 90° of knee flexion. Mixed models were used to determine strain between tendon regions and sex at 60% MVIC in 90° of knee flexion. Sequential modeling was used to fit region, sex, %MVIC, and angle to predict strain. The central region had less strain compared with both medial and lateral regions. The lateral region had higher strain compared with the medial region regardless of sex. Females had higher strain compared with males, regardless of region. Knee position did not influence tendon strain. Patellar tendon strain differs by region and sex. The varying prevalence between sex and in location of patellar tendinopathy may in part be explained by the unbalanced strains. Differential assessment of regional patellar tendon strain may be of importance for understanding injury risk and recovery with exercise.

中文翻译：

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测量位置很重要：揭示体内髌腱拉伤的区域动力学和性别差异


与女性运动员相比，男性运动员的髌腱病更常见，通常出现在肌腱的内侧区域。然而，肌腱内侧、中央和外侧区域的髌腱拉伤的单独测量尚未量化。目的是研究健康男性和女性髌腱内侧、外侧和中央区域之间肌腱应变的差异。在膝关节屈曲 60° 和 90° 的最大自主收缩 （MVIC） 的 20°、40%、60%、80% 和 100% 的最大自主收缩 （MVIC） 期间，使用超声评估健康参与者 （10 名男性，10 名女性） 髌腱内侧和外侧区域的拉伤。在膝关节屈曲 90° 时，还测量了 60% MVIC 的中央应变。混合模型用于确定膝关节屈曲 90° 时 60% MVIC 的肌腱区域和性别之间的应变。采用顺序建模拟合区域、性别、%MVIC 和角度以预测应变。与内侧和外侧区域相比，中央区域的压力较小。与内侧区域相比，无论性别如何，外侧区域的压力都更高。与雄性相比，无论地区如何，女性的应变都更高。膝关节位置不影响肌腱拉伤。髌腱拉伤因地区和性别而异。髌腱病的性别和位置不同患病率可能部分是由不平衡的菌株解释的。区域髌腱拉伤的鉴别评估对于了解损伤风险和运动恢复可能很重要。