Crotty N M Nuala, Daniels Katherine A J, McFadden Ciaran, Cafferkey Niall, King Enda
School of Medicine, Trinity College Dublin, Dublin, Ireland.
Sports Medicine Research Department, Sports Surgery Clinic, Dublin, Ireland.
Orthop J Sports Med. 2022 Jan 5;10(1):23259671211063800. doi: 10.1177/23259671211063800. eCollection 2022 Jan.
Deficits in knee strength after anterior cruciate ligament reconstruction (ACLR) surgery are common. Deficits in the single-leg drop jump (SLDJ), a test of plyometric ability, are also found.
To examine the relationship between isokinetic knee strength, SLDJ performance, and self-reported knee function 9 months after ACLR.
Cross-sectional study; Level of evidence, 3.
Knee isokinetic peak torque, SLDJ jump height, contact time, and reactive strength index (RSI), as well as International Knee Documentation Committee (IKDC) scores were assessed in 116 male, field-sport athletes at 9.2 months after ACLR. SLDJ testing took place in a 3-dimensional biomechanics laboratory. Linear regression models were used to analyze the relationship between the variables.
A significant relationship was found between ACLR-limb isokinetic knee extensor strength and SLDJ jump height ( < .001, = 0.29) and RSI ( < .001, = 0.33), and between ACLR-limb isokinetic knee flexor strength and SLDJ jump height ( < .001, = 0.12) and RSI ( < .001, = 0.15). A significant positive relationship was also found between knee extensor asymmetry and SLDJ jump height asymmetry ( < .001, = 0.27) and SLDJ reactive strength asymmetry ( < .001, = 0.18). Combined ACLR-limb jump height and contact time best predicted IKDC scores ( < .001, = 0.12).
Isokinetic knee extension strength explained approximately 30% of SLDJ performance, with a much weaker relationship between knee flexion strength and SLDJ performance. Isokinetic strength and SLDJ performance were weak predictors of variation in IKDC scores.
前交叉韧带重建（ACLR）手术后膝关节力量不足很常见。在单腿跳落测试（SLDJ）中也发现了这种等长收缩能力测试的不足，这是一种对肌肉爆发力的测试。
研究ACLR术后9个月时等速膝关节力量、SLDJ表现和自我报告的膝关节功能之间的关系。
横断面研究；证据等级，3级。
对116名男性田径运动员在ACLR术后9.2个月时进行膝关节等速峰值扭矩、SLDJ跳跃高度、接触时间和反应强度指数（RSI）评估，以及国际膝关节文献委员会（IKDC）评分。SLDJ测试在三维生物力学实验室进行。使用线性回归模型分析变量之间的关系。
发现ACLR侧肢体等速膝关节伸肌力量与SLDJ跳跃高度（P<0.001，R² = 0.29）和RSI（P<0.001，R² = 0.33）之间存在显著关系，ACLR侧肢体等速膝关节屈肌力量与SLDJ跳跃高度（P<0.001，R² = 0.12）和RSI（P<0.001，R² = 0.15）之间也存在显著关系。还发现膝关节伸肌不对称与SLDJ跳跃高度不对称（P<0.001，R² = 0.27）和SLDJ反应强度不对称（P<0.001，R² = 0.18）之间存在显著正相关。ACLR侧肢体跳跃高度和接触时间的组合最能预测IKDC评分（P<0.001，R² = 0.12）。
等速膝关节伸展力量约占SLDJ表现的30%，膝关节屈曲力量与SLDJ表现之间的关系则弱得多。等速力量和SLDJ表现是IKDC评分变化的弱预测指标。
