Background. The abnormal knee joint motion patterns caused by anterior cruciate ligament (ACL) deficiency are thought to be associated with articular cartilage degeneration. High rates of meniscus tear combined with ACL rupture are observed, and these knees suffer a higher risk of early cartilage degeneration. Research Question. This study investigated lower limb muscular force patterns of ACL-deficient knees with a concomitant medial meniscus tear. Methods. 12 volunteers and 22 patients were recruited, including 12 patients with isolated ACL deficiency (ACLD) and 10 ACL-deficient patients with a concomitant medial meniscus tear (ACLDM). Level walking data at a self-selected speed were collected before surgery. Then, a musculoskeletal dynamic analysis system, AnyBody, was applied to simulate tibiofemoral flexion moments and muscle forces. Results. Our results indicate that the tibiofemoral peak flexion and extension moments in ACLDM patients are significantly lower than in controls. The rectus femoris force in ACLDM patients was significantly lower than in isolated ACL-deficient patients and the controls during mid and terminal stance phase, while no significant difference was found in hamstring and vastus force. Additionally, the gastrocnemius force in ACL-deficient patients both with and without a medial meniscus tear was lower than in controls during mid-stance phase. Significance. The ACLDM patients had lower peak tibiofemoral flexion moment, lower gastrocnemius force in mid-stance phase, and lower rectus femoris force during the mid and terminal stance phase. These results may help clinicians to better understand the muscle function and gait pattern in ACL-deficient patients with a concomitant medial meniscus tear.

中文翻译：

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伴有内侧半月板撕裂的 ACL 缺陷患者水平行走期间的肌肉力量模式。

背景。由前交叉韧带 (ACL) 缺陷引起的膝关节运动模式异​​常被认为与关节软骨退变有关。观察到半月板撕裂和 ACL 断裂的高发生率，这些膝盖遭受早期软骨退化的风险更高。研究问题。本研究调查了伴随内侧半月板撕裂的 ACL 缺陷膝关节的下肢肌肉力量模式。方法. 招募了 12 名志愿者和 22 名患者，其中包括 12 名单纯 ACL 缺陷 (ACLD) 患者和 10 名伴有内侧半月板撕裂 (ACLDM) 的 ACL 缺陷患者。在手术前以自选速度收集水平步行数据。然后，应用肌肉骨骼动力学分析系统 AnyBody 来模拟胫股屈曲力矩和肌肉力量。结果. 我们的研究结果表明，ACLDM 患者的胫股关节峰值屈曲和伸展力矩明显低于对照组。ACLDM患者的股直肌力在站立中期和末期明显低于孤立的ACL缺陷患者和对照组，而腘绳肌和股肌力无显着差异。此外，ACL 缺陷患者无论有无内侧半月板撕裂，其腓肠肌力均低于对照组。意义. ACLDM患者的胫股屈曲峰值力矩较低，站立中期腓肠肌力较低，站立中期和末期股直肌力较低。这些结果可能有助于临床医生更好地了解伴有内侧半月板撕裂的 ACL 缺陷患者的肌肉功能和步态模式。