Background

Anterior cruciate ligament (ACL) injury is one of the most common injuries of the area surrounding the knee. Muscle strength deficiency is observed following an ACL injury. Determining differences in muscle strength and gait between patients with acute and chronic ACL injury will provide crucial information for assessments and treatment plans.

Methods

We evaluated 60 patients with ACL rupture. Patients were classified into acute and chronic groups. We compared measurements of anthropometric parameters, muscle strength, gait and functional questionnaire.

Findings

The muscle strength of both knee extensors and flexors was higher in the chronic group than in the acute group. The muscle strength index for extensors was 57% in the acute group and 73% in the chronic group. However, the hamstring-to-quadriceps ratio for peak torque of the injured leg in the acute and chronic groups was similarly high at 98% and 101%, respectively. In gait, asymmetry in the hip and knee was observed in the acute group but not in the chronic group. The Knee Injury and Osteoarthritis Outcome Scores (KOOS) for symptoms, pain, activities of daily living, sports and recreational activities were higher in the chronic group than in the acute group.

Interpretation

Compared with the acute group, the gait of the chronic group is more symmetrical, and the score of KOOS is also higher. The muscle training protocols could be strategically planned according to these differences. Patients with ACL injury are characterized high hamstrings-to quadriceps peak torque ratio.

中文翻译：

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急慢性前交叉韧带损伤患者的步态和肌肉力量差异。

背景

前交叉韧带（ACL）损伤是膝盖周围区域最常见的损伤之一。ACL损伤后观察到肌肉力量不足。确定急性和慢性ACL损伤患者之间的肌肉力量和步态差异将为评估和治疗计划提供重要信息。

方法

我们评估了60例ACL破裂患者。将患者分为急性和慢性组。我们比较了人体测量参数，肌肉力量，步态和功能问卷的测量结果。

发现

慢性组的膝部伸肌和屈肌的肌肉强度均高于急性组。伸直肌的肌肉力量指数在急性组为57％，在慢性组为73％。但是，急性和慢性组腿部股四头肌的腿部扭力峰值比率相似，分别高达98％和101％。在步态中，急性组观察到臀部和膝盖的不对称，而慢性组则没有。慢性组的症状，疼痛，日常生活活动，运动和娱乐活动的膝关节损伤和骨关节炎结果得分（KOOS）高于急性组。

解释

与急性组相比，慢性组的步态更加对称，KOOS评分也更高。可以根据这些差异在战略上计划肌肉训练方案。ACL损伤患者的特征是绳肌与股四头肌的峰值扭矩比高。