【論文摘要】Lower Extremity Alignment and Dynamic Control With Associated Injury Risk in College Athletes With Knee Hyperextension: Preliminary Results

【論文摘要】有膝反曲的大學運動員下肢靜態排列及動態控制與運動傷害的關聯性：初步結果

洪爾君(Er-Chun Hung) ； 施怡芬(Yi-Fen Shih) ； 陳文英(Wen-Yin Chen)

《物理治療》 43卷4期 (2018/12) Pp. 347-348

https://doi.org/10.6215/FJPT.201812.P46

摘要

Background and Purpose: Knee hyperextension would result in excessive tension of the passive tissues such as anterior cruciate ligament (ACL) and posterior capsule of the knee. Subjects may also develop compensations at the hip and ankle joints, resulted in lower extremity (LE) malalignment. Muscles around the knee could also become dysfunctional when performing functional tasks requiring terminal knee extension. In athletes, landing from a jump on an extended knee is one of the reasons resulting in ACL injury. Little is known about the injury rate of athletes with knee hyperextension who participate in sports involving landing activities. The aim of this study is to explore if poor LE alignment and landing pattern are associated with knee hyperextension and if injury rate is higher in these athletes. Methods: We recruited athletes with knee hyperextension group (KHG) (n = 19) and matched with those without knee hyperextension group (NKHG) (n = 19) on age, sex, and body mass index (BMI). Basic data, and LE alignments of both legs were recorded. Kinematic and kinetics data were measured with 3-axis-accelerator motion system and force plate, muscle activity data during the jump-landing task was also collected. Sport injury occurrence were recorded when follow up at the 1st month. Results: Navicular drop was higher in KHG than NKHG (p ＜ 0.01). Subjects in KHG had more hip internal rotation (p = 0.05) and higher posterior ground reaction force (p ＜ 0.05) than NKHG during the landing task. Conclusion: Knee hyperextension is associated with LE malalignment in the hip and ankle. During the landing task, ground reaction force was higher toward the posterior direction, which has been shown an important predictor of sports injury. However, sports injury rate at the 1st month follow up was not significantly different between the 2 groups. Clinical Relevance: Athletes with knee hyperextension are prone to having compensatory LE alignment in other joints and excessive posterior ground reaction force during landing. Movement correction to avoid knee hyperextension may help reducing their injury rate during jump-landing activities.