Evans-Pickett Alyssa, Franz Jason R, Padua Darin A, Kiefer Adam, Schwartz Todd A, Pietrosimone Brian
MOTION Science Institute, Department of Exercise and Sport Science.
Human Movement Science Curriculum.
J Athl Train. 2025 Apr 1;60(4):288-295. doi: 10.4085/1062-6050-0266.24.
Postoperative muscle weakness contributes to the development of aberrant gait biomechanics that persist after traditional anterior cruciate ligament reconstruction (ACLR). However, it is unknown if quadriceps weakness impedes the ability of ACLR patients to modify gait biomechanics using a real-time gait biofeedback (RTGBF) intervention.
The purpose was to determine if quadriceps strength is associated with the ability to modify vertical ground reaction force (vGRF) during a RTGBF intervention.
Cross-sectional study.
Research laboratory.
Thirty-five individuals with unilateral ACLR (time since ACLR = 32 ± 16 months; 22 females, 13 males).
MAIN OUTCOME MEASURE(S): Peak vGRF (pvGRF) was evaluated during a baseline walking trial and three 250-step randomized RTGBF walking trials, by 5%, 10%, or 15% body weight (BW). The ability to modify gait was reported as changes in pvGRF (ΔpvGRF; body weight [BW]) and root mean square error (RMSE) of the peak vGRF relative to the feedback target (pvGRF RMSE; BW). We also calculated quadriceps strength.
No significant associations were found between strength (mean = 2.56 ± 0.75 Nm/kg; range, 0.84-4.6 Nm/kg) and ΔpvGRF (5% ΔpvGRF: 0.04 ± 0.03 BW, 10% ΔpvGRF: 0.10 ± 0.03 BW, 15% ΔpvGRF: 0.15 ± 0.04 BW) nor strength and RMSE (5% RMSE: 0.04 ± 0.02 BW, 10% RMSE: 0.05 ± 0.02 BW, 15% RMSE: 0.08 ± 0.04 BW) for any of the 3 RTGBF trials (R2 = 0.003-0.025; P = .37-.77).
The magnitude of quadriceps strength did not influence the ability to modify gait using RTGBF. These data suggest that it may be unnecessary to wait for quadriceps full strength recovery to capitalize on the benefits of RTGBF after ACLR.
术后肌肉无力会导致异常步态生物力学的发展，这种异常在传统的前交叉韧带重建（ACLR）后仍然存在。然而，股四头肌无力是否会阻碍ACLR患者使用实时步态生物反馈（RTGBF）干预来改变步态生物力学尚不清楚。
目的是确定在RTGBF干预期间股四头肌力量是否与改变垂直地面反作用力（vGRF）的能力相关。
横断面研究。
研究实验室。
35名单侧ACLR患者（ACLR后时间 = 32 ± 16个月；22名女性，13名男性）。
在基线步行试验和三次250步随机RTGBF步行试验中，按体重的5%、10%或15%评估峰值vGRF（pvGRF）。步态改变能力以pvGRF的变化（ΔpvGRF；体重[BW]）和峰值vGRF相对于反馈目标的均方根误差（RMSE）（pvGRF RMSE；BW）来表示。我们还计算了股四头肌力量。
在任何一次RTGBF试验中，力量（平均值 = 2.56 ± 0.75 Nm/kg；范围，0.84 - 4.6 Nm/kg）与ΔpvGRF（5%ΔpvGRF：0.04 ± 0.03 BW，10%ΔpvGRF：0.10 ± 0.03 BW，15%ΔpvGRF：0.15 ± 0.04 BW）或力量与RMSE（5%RMSE：0.04 ± 0.02 BW，10%RMSE：0.05 ± 0.02 BW，15%RMSE：0.08 ± 0.04 BW）之间均未发现显著相关性（R2 = 0.003 - 0.025；P = 0.37 - 0.77）。
股四头肌力量的大小并不影响使用RTGBF改变步态的能力。这些数据表明，在ACLR后利用RTGBF的益处可能无需等待股四头肌完全恢复力量。
